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| -rw-r--r-- | proxy_wizard/scripts/squid.conf.default | 7268 |
1 files changed, 5590 insertions, 1678 deletions
diff --git a/proxy_wizard/scripts/squid.conf.default b/proxy_wizard/scripts/squid.conf.default index 0b67b709..b7b6648b 100644 --- a/proxy_wizard/scripts/squid.conf.default +++ b/proxy_wizard/scripts/squid.conf.default @@ -1,243 +1,2303 @@ +# WELCOME TO SQUID 3.2.10 +# ---------------------------- +# +# This is the documentation for the Squid configuration file. +# This documentation can also be found online at: +# http://www.squid-cache.org/Doc/config/ +# +# You may wish to look at the Squid home page and wiki for the +# FAQ and other documentation: +# http://www.squid-cache.org/ +# http://wiki.squid-cache.org/SquidFaq +# http://wiki.squid-cache.org/ConfigExamples +# +# This documentation shows what the defaults for various directives +# happen to be. If you don't need to change the default, you should +# leave the line out of your squid.conf in most cases. +# +# In some cases "none" refers to no default setting at all, +# while in other cases it refers to the value of the option +# - the comments for that keyword indicate if this is the case. +# + +# Configuration options can be included using the "include" directive. +# Include takes a list of files to include. Quoting and wildcards are +# supported. +# +# For example, +# +# include /path/to/included/file/squid.acl.config +# +# Includes can be nested up to a hard-coded depth of 16 levels. +# This arbitrary restriction is to prevent recursive include references +# from causing Squid entering an infinite loop whilst trying to load +# configuration files. +# +# +# Conditional configuration +# +# If-statements can be used to make configuration directives +# depend on conditions: +# +# if <CONDITION> +# ... regular configuration directives ... +# [else +# ... regular configuration directives ...] +# endif +# +# The else part is optional. The keywords "if", "else", and "endif" +# must be typed on their own lines, as if they were regular +# configuration directives. +# +# NOTE: An else-if condition is not supported. +# +# These individual conditions types are supported: +# +# true +# Always evaluates to true. +# false +# Always evaluates to false. +# <integer> = <integer> +# Equality comparison of two integer numbers. +# +# +# SMP-Related Macros +# +# The following SMP-related preprocessor macros can be used. +# +# ${process_name} expands to the current Squid process "name" +# (e.g., squid1, squid2, or cache1). +# +# ${process_number} expands to the current Squid process +# identifier, which is an integer number (e.g., 1, 2, 3) unique +# across all Squid processes. + +# TAG: broken_vary_encoding +# This option is not yet supported by Squid-3. +#Default: +# none + +# TAG: cache_vary +# This option is not yet supported by Squid-3. +#Default: +# none + +# TAG: collapsed_forwarding +# This option is not yet supported by Squid-3. see http://bugs.squid-cache.org/show_bug.cgi?id=3495 +#Default: +# none + +# TAG: error_map +# This option is not yet supported by Squid-3. +#Default: +# none + +# TAG: external_refresh_check +# This option is not yet supported by Squid-3. +#Default: +# none + +# TAG: ignore_ims_on_miss +# This option is not yet supported by Squid-3. +#Default: +# none + +# TAG: location_rewrite_program +# This option is not yet supported by Squid-3. +#Default: +# none + +# TAG: refresh_stale_hit +# This option is not yet supported by Squid-3. +#Default: +# none + +# TAG: storeurl_access +# This option is not yet supported by this version of Squid-3. Please try a later release. +#Default: +# none + +# TAG: ignore_expect_100 +# Remove this line. The HTTP/1.1 feature is now fully supported by default. +#Default: +# none + +# TAG: dns_v4_fallback +# Remove this line. Squid performs a 'Happy Eyeballs' algorithm, the 'fallback' algorithm is no longer relevant. +#Default: +# none + +# TAG: ftp_list_width +# Remove this line. Configure FTP page display using the CSS controls in errorpages.css instead. +#Default: +# none + +# TAG: maximum_single_addr_tries +# Replaced by connect_retries. The behaviour has changed, please read the documentation before altering. +#Default: +# none + +# TAG: update_headers +# Remove this line. The feature is supported by default in storage types where update is implemented. +#Default: +# none + +# TAG: url_rewrite_concurrency +# Remove this line. Set the 'concurrency=' option of url_rewrite_children instead. +#Default: +# none + +# TAG: dns_testnames +# Remove this line. DNS is no longer tested on startup. +#Default: +# none + +# TAG: extension_methods +# Remove this line. All valid methods for HTTP are accepted by default. +#Default: +# none + +# TAG: zero_buffers +#Default: +# none + +# TAG: incoming_rate +#Default: +# none + +# TAG: server_http11 +# Remove this line. HTTP/1.1 is supported by default. +#Default: +# none + +# TAG: upgrade_http0.9 +# Remove this line. ICY/1.0 streaming protocol is supported by default. +#Default: +# none + +# TAG: zph_local +# Alter these entries. Use the qos_flows directive instead. +#Default: +# none + +# TAG: header_access +# Since squid-3.0 replace with request_header_access or reply_header_access +# depending on whether you wish to match client requests or server replies. +#Default: +# none + +# TAG: httpd_accel_no_pmtu_disc +# Since squid-3.0 use the 'disable-pmtu-discovery' flag on http_port instead. +#Default: +# none + +# TAG: wais_relay_host +# Replace this line with 'cache_peer' configuration. +#Default: +# none + +# TAG: wais_relay_port +# Replace this line with 'cache_peer' configuration. +#Default: +# none + +# OPTIONS FOR AUTHENTICATION +# ----------------------------------------------------------------------------- + +# TAG: auth_param +# This is used to define parameters for the various authentication +# schemes supported by Squid. +# +# format: auth_param scheme parameter [setting] +# +# The order in which authentication schemes are presented to the client is +# dependent on the order the scheme first appears in config file. IE +# has a bug (it's not RFC 2617 compliant) in that it will use the basic +# scheme if basic is the first entry presented, even if more secure +# schemes are presented. For now use the order in the recommended +# settings section below. If other browsers have difficulties (don't +# recognize the schemes offered even if you are using basic) either +# put basic first, or disable the other schemes (by commenting out their +# program entry). +# +# Once an authentication scheme is fully configured, it can only be +# shutdown by shutting squid down and restarting. Changes can be made on +# the fly and activated with a reconfigure. I.E. You can change to a +# different helper, but not unconfigure the helper completely. +# +# Please note that while this directive defines how Squid processes +# authentication it does not automatically activate authentication. +# To use authentication you must in addition make use of ACLs based +# on login name in http_access (proxy_auth, proxy_auth_regex or +# external with %LOGIN used in the format tag). The browser will be +# challenged for authentication on the first such acl encountered +# in http_access processing and will also be re-challenged for new +# login credentials if the request is being denied by a proxy_auth +# type acl. +# +# WARNING: authentication can't be used in a transparently intercepting +# proxy as the client then thinks it is talking to an origin server and +# not the proxy. This is a limitation of bending the TCP/IP protocol to +# transparently intercepting port 80, not a limitation in Squid. +# Ports flagged 'transparent', 'intercept', or 'tproxy' have +# authentication disabled. +# +# === Parameters for the basic scheme follow. === +# +# "program" cmdline +# Specify the command for the external authenticator. Such a program +# reads a line containing "username password" and replies "OK" or +# "ERR" in an endless loop. "ERR" responses may optionally be followed +# by a error description available as %m in the returned error page. +# If you use an authenticator, make sure you have 1 acl of type +# proxy_auth. +# +# By default, the basic authentication scheme is not used unless a +# program is specified. +# +# If you want to use the traditional NCSA proxy authentication, set +# this line to something like +# +# auth_param basic program /usr/libexec/ncsa_auth /usr/etc/passwd +# +# "utf8" on|off +# HTTP uses iso-latin-1 as character set, while some authentication +# backends such as LDAP expects UTF-8. If this is set to on Squid will +# translate the HTTP iso-latin-1 charset to UTF-8 before sending the +# username & password to the helper. +# +# "children" numberofchildren [startup=N] [idle=N] [concurrency=N] +# The maximum number of authenticator processes to spawn. If you start too few +# Squid will have to wait for them to process a backlog of credential +# verifications, slowing it down. When password verifications are +# done via a (slow) network you are likely to need lots of +# authenticator processes. +# +# The startup= and idle= options permit some skew in the exact amount +# run. A minimum of startup=N will begin during startup and reconfigure. +# Squid will start more in groups of up to idle=N in an attempt to meet +# traffic needs and to keep idle=N free above those traffic needs up to +# the maximum. +# +# The concurrency= option sets the number of concurrent requests the +# helper can process. The default of 0 is used for helpers who only +# supports one request at a time. Setting this to a number greater than +# 0 changes the protocol used to include a channel number first on the +# request/response line, allowing multiple requests to be sent to the +# same helper in parallel without waiting for the response. +# Must not be set unless it's known the helper supports this. +# +# auth_param basic children 20 startup=0 idle=1 +# +# "realm" realmstring +# Specifies the realm name which is to be reported to the +# client for the basic proxy authentication scheme (part of +# the text the user will see when prompted their username and +# password). There is no default. +# auth_param basic realm Squid proxy-caching web server +# +# "credentialsttl" timetolive +# Specifies how long squid assumes an externally validated +# username:password pair is valid for - in other words how +# often the helper program is called for that user. Set this +# low to force revalidation with short lived passwords. Note +# setting this high does not impact your susceptibility +# to replay attacks unless you are using an one-time password +# system (such as SecureID). If you are using such a system, +# you will be vulnerable to replay attacks unless you also +# use the max_user_ip ACL in an http_access rule. +# +# "casesensitive" on|off +# Specifies if usernames are case sensitive. Most user databases are +# case insensitive allowing the same username to be spelled using both +# lower and upper case letters, but some are case sensitive. This +# makes a big difference for user_max_ip ACL processing and similar. +# auth_param basic casesensitive off +# +# === Parameters for the digest scheme follow === +# +# "program" cmdline +# Specify the command for the external authenticator. Such +# a program reads a line containing "username":"realm" and +# replies with the appropriate H(A1) value hex encoded or +# ERR if the user (or his H(A1) hash) does not exists. +# See rfc 2616 for the definition of H(A1). +# "ERR" responses may optionally be followed by a error description +# available as %m in the returned error page. +# +# By default, the digest authentication scheme is not used unless a +# program is specified. +# +# If you want to use a digest authenticator, set this line to +# something like +# +# auth_param digest program /usr/bin/digest_pw_auth /usr/etc/digpass +# +# "utf8" on|off +# HTTP uses iso-latin-1 as character set, while some authentication +# backends such as LDAP expects UTF-8. If this is set to on Squid will +# translate the HTTP iso-latin-1 charset to UTF-8 before sending the +# username & password to the helper. +# +# "children" numberofchildren [startup=N] [idle=N] [concurrency=N] +# The maximum number of authenticator processes to spawn (default 5). +# If you start too few Squid will have to wait for them to +# process a backlog of H(A1) calculations, slowing it down. +# When the H(A1) calculations are done via a (slow) network +# you are likely to need lots of authenticator processes. +# +# The startup= and idle= options permit some skew in the exact amount +# run. A minimum of startup=N will begin during startup and reconfigure. +# Squid will start more in groups of up to idle=N in an attempt to meet +# traffic needs and to keep idle=N free above those traffic needs up to +# the maximum. +# +# The concurrency= option sets the number of concurrent requests the +# helper can process. The default of 0 is used for helpers who only +# supports one request at a time. Setting this to a number greater than +# 0 changes the protocol used to include a channel number first on the +# request/response line, allowing multiple requests to be sent to the +# same helper in parallel without waiting for the response. +# Must not be set unless it's known the helper supports this. +# +# auth_param digest children 20 startup=0 idle=1 +# +# "realm" realmstring +# Specifies the realm name which is to be reported to the +# client for the digest proxy authentication scheme (part of +# the text the user will see when prompted their username and +# password). There is no default. +# auth_param digest realm Squid proxy-caching web server +# +# "nonce_garbage_interval" timeinterval +# Specifies the interval that nonces that have been issued +# to client_agent's are checked for validity. +# +# "nonce_max_duration" timeinterval +# Specifies the maximum length of time a given nonce will be +# valid for. +# +# "nonce_max_count" number +# Specifies the maximum number of times a given nonce can be +# used. +# +# "nonce_strictness" on|off +# Determines if squid requires strict increment-by-1 behavior +# for nonce counts, or just incrementing (off - for use when +# user agents generate nonce counts that occasionally miss 1 +# (ie, 1,2,4,6)). Default off. +# +# "check_nonce_count" on|off +# This directive if set to off can disable the nonce count check +# completely to work around buggy digest qop implementations in +# certain mainstream browser versions. Default on to check the +# nonce count to protect from authentication replay attacks. +# +# "post_workaround" on|off +# This is a workaround to certain buggy browsers who sends +# an incorrect request digest in POST requests when reusing +# the same nonce as acquired earlier on a GET request. +# +# === NTLM scheme options follow === +# +# "program" cmdline +# Specify the command for the external NTLM authenticator. +# Such a program reads exchanged NTLMSSP packets with +# the browser via Squid until authentication is completed. +# If you use an NTLM authenticator, make sure you have 1 acl +# of type proxy_auth. By default, the NTLM authenticator_program +# is not used. +# +# auth_param ntlm program /usr/bin/ntlm_auth +# +# "children" numberofchildren [startup=N] [idle=N] +# The maximum number of authenticator processes to spawn (default 5). +# If you start too few Squid will have to wait for them to +# process a backlog of credential verifications, slowing it +# down. When credential verifications are done via a (slow) +# network you are likely to need lots of authenticator +# processes. +# +# The startup= and idle= options permit some skew in the exact amount +# run. A minimum of startup=N will begin during startup and reconfigure. +# Squid will start more in groups of up to idle=N in an attempt to meet +# traffic needs and to keep idle=N free above those traffic needs up to +# the maximum. +# +# auth_param ntlm children 20 startup=0 idle=1 +# +# "keep_alive" on|off +# If you experience problems with PUT/POST requests when using the +# Negotiate authentication scheme then you can try setting this to +# off. This will cause Squid to forcibly close the connection on +# the initial requests where the browser asks which schemes are +# supported by the proxy. +# +# auth_param ntlm keep_alive on +# +# === Options for configuring the NEGOTIATE auth-scheme follow === +# +# "program" cmdline +# Specify the command for the external Negotiate authenticator. +# This protocol is used in Microsoft Active-Directory enabled setups with +# the Microsoft Internet Explorer or Mozilla Firefox browsers. +# Its main purpose is to exchange credentials with the Squid proxy +# using the Kerberos mechanisms. +# If you use a Negotiate authenticator, make sure you have at least +# one acl of type proxy_auth active. By default, the negotiate +# authenticator_program is not used. +# The only supported program for this role is the ntlm_auth +# program distributed as part of Samba, version 4 or later. +# +# auth_param negotiate program /usr/bin/ntlm_auth --helper-protocol=gss-spnego +# +# "children" numberofchildren [startup=N] [idle=N] +# The maximum number of authenticator processes to spawn (default 5). +# If you start too few Squid will have to wait for them to +# process a backlog of credential verifications, slowing it +# down. When credential verifications are done via a (slow) +# network you are likely to need lots of authenticator +# processes. +# +# The startup= and idle= options permit some skew in the exact amount +# run. A minimum of startup=N will begin during startup and reconfigure. +# Squid will start more in groups of up to idle=N in an attempt to meet +# traffic needs and to keep idle=N free above those traffic needs up to +# the maximum. +# +# auth_param negotiate children 20 startup=0 idle=1 +# +# "keep_alive" on|off +# If you experience problems with PUT/POST requests when using the +# Negotiate authentication scheme then you can try setting this to +# off. This will cause Squid to forcibly close the connection on +# the initial requests where the browser asks which schemes are +# supported by the proxy. +# +# auth_param negotiate keep_alive on +# +# +# Examples: +# +##Recommended minimum configuration per scheme: +##auth_param negotiate program <uncomment and complete this line to activate> +##auth_param negotiate children 20 startup=0 idle=1 +##auth_param negotiate keep_alive on +## +##auth_param ntlm program <uncomment and complete this line to activate> +##auth_param ntlm children 20 startup=0 idle=1 +##auth_param ntlm keep_alive on +## +##auth_param digest program <uncomment and complete this line> +##auth_param digest children 20 startup=0 idle=1 +##auth_param digest realm Squid proxy-caching web server +##auth_param digest nonce_garbage_interval 5 minutes +##auth_param digest nonce_max_duration 30 minutes +##auth_param digest nonce_max_count 50 +## +##auth_param basic program <uncomment and complete this line> +##auth_param basic children 5 startup=5 idle=1 +##auth_param basic realm Squid proxy-caching web server +##auth_param basic credentialsttl 2 hours +#Default: +# none + +# TAG: authenticate_cache_garbage_interval +# The time period between garbage collection across the username cache. +# This is a trade-off between memory utilization (long intervals - say +# 2 days) and CPU (short intervals - say 1 minute). Only change if you +# have good reason to. +#Default: +# authenticate_cache_garbage_interval 1 hour + +# TAG: authenticate_ttl +# The time a user & their credentials stay in the logged in +# user cache since their last request. When the garbage +# interval passes, all user credentials that have passed their +# TTL are removed from memory. +#Default: +# authenticate_ttl 1 hour + +# TAG: authenticate_ip_ttl +# If you use proxy authentication and the 'max_user_ip' ACL, +# this directive controls how long Squid remembers the IP +# addresses associated with each user. Use a small value +# (e.g., 60 seconds) if your users might change addresses +# quickly, as is the case with dialup. You might be safe +# using a larger value (e.g., 2 hours) in a corporate LAN +# environment with relatively static address assignments. +#Default: +# authenticate_ip_ttl 0 seconds + +# ACCESS CONTROLS +# ----------------------------------------------------------------------------- + +# TAG: external_acl_type +# This option defines external acl classes using a helper program +# to look up the status +# +# external_acl_type name [options] FORMAT.. /path/to/helper [helper arguments..] +# +# Options: +# +# ttl=n TTL in seconds for cached results (defaults to 3600 +# for 1 hour) +# negative_ttl=n +# TTL for cached negative lookups (default same +# as ttl) +# children-max=n +# Maximum number of acl helper processes spawned to service +# external acl lookups of this type. (default 20) +# children-startup=n +# Minimum number of acl helper processes to spawn during +# startup and reconfigure to service external acl lookups +# of this type. (default 0) +# children-idle=n +# Number of acl helper processes to keep ahead of traffic +# loads. Squid will spawn this many at once whenever load +# rises above the capabilities of existing processes. +# Up to the value of children-max. (default 1) +# concurrency=n concurrency level per process. Only used with helpers +# capable of processing more than one query at a time. +# cache=n limit the result cache size, default is unbounded. +# grace=n Percentage remaining of TTL where a refresh of a +# cached entry should be initiated without needing to +# wait for a new reply. (default is for no grace period) +# protocol=2.5 Compatibility mode for Squid-2.5 external acl helpers +# ipv4 / ipv6 IP protocol used to communicate with this helper. +# The default is to auto-detect IPv6 and use it when available. +# +# FORMAT specifications +# +# %LOGIN Authenticated user login name +# %EXT_USER Username from previous external acl +# %EXT_LOG Log details from previous external acl +# %EXT_TAG Tag from previous external acl +# %IDENT Ident user name +# %SRC Client IP +# %SRCPORT Client source port +# %URI Requested URI +# %DST Requested host +# %PROTO Requested protocol +# %PORT Requested port +# %PATH Requested URL path +# %METHOD Request method +# %MYADDR Squid interface address +# %MYPORT Squid http_port number +# %PATH Requested URL-path (including query-string if any) +# %USER_CERT SSL User certificate in PEM format +# %USER_CERTCHAIN SSL User certificate chain in PEM format +# %USER_CERT_xx SSL User certificate subject attribute xx +# %USER_CA_xx SSL User certificate issuer attribute xx +# +# %>{Header} HTTP request header "Header" +# %>{Hdr:member} +# HTTP request header "Hdr" list member "member" +# %>{Hdr:;member} +# HTTP request header list member using ; as +# list separator. ; can be any non-alphanumeric +# character. +# +# %<{Header} HTTP reply header "Header" +# %<{Hdr:member} +# HTTP reply header "Hdr" list member "member" +# %<{Hdr:;member} +# HTTP reply header list member using ; as +# list separator. ; can be any non-alphanumeric +# character. +# +# %% The percent sign. Useful for helpers which need +# an unchanging input format. +# +# In addition to the above, any string specified in the referencing +# acl will also be included in the helper request line, after the +# specified formats (see the "acl external" directive) +# +# The helper receives lines per the above format specification, +# and returns lines starting with OK or ERR indicating the validity +# of the request and optionally followed by additional keywords with +# more details. +# +# General result syntax: +# +# OK/ERR keyword=value ... +# +# Defined keywords: +# +# user= The users name (login) +# password= The users password (for login= cache_peer option) +# message= Message describing the reason. Available as %o +# in error pages +# tag= Apply a tag to a request (for both ERR and OK results) +# Only sets a tag, does not alter existing tags. +# log= String to be logged in access.log. Available as +# %ea in logformat specifications +# +# If protocol=3.0 (the default) then URL escaping is used to protect +# each value in both requests and responses. +# +# If using protocol=2.5 then all values need to be enclosed in quotes +# if they may contain whitespace, or the whitespace escaped using \. +# And quotes or \ characters within the keyword value must be \ escaped. +# +# When using the concurrency= option the protocol is changed by +# introducing a query channel tag infront of the request/response. +# The query channel tag is a number between 0 and concurrency-1. +#Default: +# none + +# TAG: acl +# Defining an Access List +# +# Every access list definition must begin with an aclname and acltype, +# followed by either type-specific arguments or a quoted filename that +# they are read from. +# +# acl aclname acltype argument ... +# acl aclname acltype "file" ... +# +# When using "file", the file should contain one item per line. +# +# By default, regular expressions are CASE-SENSITIVE. +# To make them case-insensitive, use the -i option. To return case-sensitive +# use the +i option between patterns, or make a new ACL line without -i. +# +# Some acl types require suspending the current request in order +# to access some external data source. +# Those which do are marked with the tag [slow], those which +# don't are marked as [fast]. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl +# for further information +# +# ***** ACL TYPES AVAILABLE ***** +# +# acl aclname src ip-address/netmask ... # clients IP address [fast] +# acl aclname src addr1-addr2/netmask ... # range of addresses [fast] +# acl aclname dst ip-address/netmask ... # URL host's IP address [slow] +# acl aclname myip ip-address/netmask ... # local socket IP address [fast] +# +# acl aclname arp mac-address ... (xx:xx:xx:xx:xx:xx notation) +# # The arp ACL requires the special configure option --enable-arp-acl. +# # Furthermore, the ARP ACL code is not portable to all operating systems. +# # It works on Linux, Solaris, Windows, FreeBSD, and some +# # other *BSD variants. +# # [fast] +# # +# # NOTE: Squid can only determine the MAC address for clients that are on +# # the same subnet. If the client is on a different subnet, +# # then Squid cannot find out its MAC address. +# +# acl aclname srcdomain .foo.com ... +# # reverse lookup, from client IP [slow] +# acl aclname dstdomain .foo.com ... +# # Destination server from URL [fast] +# acl aclname srcdom_regex [-i] \.foo\.com ... +# # regex matching client name [slow] +# acl aclname dstdom_regex [-i] \.foo\.com ... +# # regex matching server [fast] +# # +# # For dstdomain and dstdom_regex a reverse lookup is tried if a IP +# # based URL is used and no match is found. The name "none" is used +# # if the reverse lookup fails. +# +# acl aclname src_as number ... +# acl aclname dst_as number ... +# # [fast] +# # Except for access control, AS numbers can be used for +# # routing of requests to specific caches. Here's an +# # example for routing all requests for AS#1241 and only +# # those to mycache.mydomain.net: +# # acl asexample dst_as 1241 +# # cache_peer_access mycache.mydomain.net allow asexample +# # cache_peer_access mycache_mydomain.net deny all +# +# acl aclname peername myPeer ... +# # [fast] +# # match against a named cache_peer entry +# # set unique name= on cache_peer lines for reliable use. +# +# acl aclname time [day-abbrevs] [h1:m1-h2:m2] +# # [fast] +# # day-abbrevs: +# # S - Sunday +# # M - Monday +# # T - Tuesday +# # W - Wednesday +# # H - Thursday +# # F - Friday +# # A - Saturday +# # h1:m1 must be less than h2:m2 +# +# acl aclname url_regex [-i] ^http:// ... +# # regex matching on whole URL [fast] +# acl aclname urllogin [-i] [^a-zA-Z0-9] ... +# # regex matching on URL login field +# acl aclname urlpath_regex [-i] \.gif$ ... +# # regex matching on URL path [fast] +# +# acl aclname port 80 70 21 0-1024... # destination TCP port [fast] +# # ranges are alloed +# acl aclname myport 3128 ... # local socket TCP port [fast] +# acl aclname myportname 3128 ... # http(s)_port name [fast] +# +# acl aclname proto HTTP FTP ... # request protocol [fast] +# +# acl aclname method GET POST ... # HTTP request method [fast] +# +# acl aclname http_status 200 301 500- 400-403 ... +# # status code in reply [fast] +# +# acl aclname browser [-i] regexp ... +# # pattern match on User-Agent header (see also req_header below) [fast] +# +# acl aclname referer_regex [-i] regexp ... +# # pattern match on Referer header [fast] +# # Referer is highly unreliable, so use with care +# +# acl aclname ident username ... +# acl aclname ident_regex [-i] pattern ... +# # string match on ident output [slow] +# # use REQUIRED to accept any non-null ident. +# +# acl aclname proxy_auth [-i] username ... +# acl aclname proxy_auth_regex [-i] pattern ... +# # perform http authentication challenge to the client and match against +# # supplied credentials [slow] +# # +# # takes a list of allowed usernames. +# # use REQUIRED to accept any valid username. +# # +# # Will use proxy authentication in forward-proxy scenarios, and plain +# # http authenticaiton in reverse-proxy scenarios +# # +# # NOTE: when a Proxy-Authentication header is sent but it is not +# # needed during ACL checking the username is NOT logged +# # in access.log. +# # +# # NOTE: proxy_auth requires a EXTERNAL authentication program +# # to check username/password combinations (see +# # auth_param directive). +# # +# # NOTE: proxy_auth can't be used in a transparent/intercepting proxy +# # as the browser needs to be configured for using a proxy in order +# # to respond to proxy authentication. +# +# acl aclname snmp_community string ... +# # A community string to limit access to your SNMP Agent [fast] +# # Example: +# # +# # acl snmppublic snmp_community public +# +# acl aclname maxconn number +# # This will be matched when the client's IP address has +# # more than <number> TCP connections established. [fast] +# # NOTE: This only measures direct TCP links so X-Forwarded-For +# # indirect clients are not counted. +# +# acl aclname max_user_ip [-s] number +# # This will be matched when the user attempts to log in from more +# # than <number> different ip addresses. The authenticate_ip_ttl +# # parameter controls the timeout on the ip entries. [fast] +# # If -s is specified the limit is strict, denying browsing +# # from any further IP addresses until the ttl has expired. Without +# # -s Squid will just annoy the user by "randomly" denying requests. +# # (the counter is reset each time the limit is reached and a +# # request is denied) +# # NOTE: in acceleration mode or where there is mesh of child proxies, +# # clients may appear to come from multiple addresses if they are +# # going through proxy farms, so a limit of 1 may cause user problems. +# +# acl aclname random probability +# # Pseudo-randomly match requests. Based on the probability given. +# # Probability may be written as a decimal (0.333), fraction (1/3) +# # or ratio of matches:non-matches (3:5). +# +# acl aclname req_mime_type [-i] mime-type ... +# # regex match against the mime type of the request generated +# # by the client. Can be used to detect file upload or some +# # types HTTP tunneling requests [fast] +# # NOTE: This does NOT match the reply. You cannot use this +# # to match the returned file type. +# +# acl aclname req_header header-name [-i] any\.regex\.here +# # regex match against any of the known request headers. May be +# # thought of as a superset of "browser", "referer" and "mime-type" +# # ACL [fast] +# +# acl aclname rep_mime_type [-i] mime-type ... +# # regex match against the mime type of the reply received by +# # squid. Can be used to detect file download or some +# # types HTTP tunneling requests. [fast] +# # NOTE: This has no effect in http_access rules. It only has +# # effect in rules that affect the reply data stream such as +# # http_reply_access. +# +# acl aclname rep_header header-name [-i] any\.regex\.here +# # regex match against any of the known reply headers. May be +# # thought of as a superset of "browser", "referer" and "mime-type" +# # ACLs [fast] +# +# acl aclname external class_name [arguments...] +# # external ACL lookup via a helper class defined by the +# # external_acl_type directive [slow] +# +# acl aclname user_cert attribute values... +# # match against attributes in a user SSL certificate +# # attribute is one of DN/C/O/CN/L/ST [fast] +# +# acl aclname ca_cert attribute values... +# # match against attributes a users issuing CA SSL certificate +# # attribute is one of DN/C/O/CN/L/ST [fast] +# +# acl aclname ext_user username ... +# acl aclname ext_user_regex [-i] pattern ... +# # string match on username returned by external acl helper [slow] +# # use REQUIRED to accept any non-null user name. +# +# acl aclname tag tagvalue ... +# # string match on tag returned by external acl helper [slow] +# +# acl aclname hier_code codename ... +# # string match against squid hierarchy code(s); [fast] +# # e.g., DIRECT, PARENT_HIT, NONE, etc. +# # +# # NOTE: This has no effect in http_access rules. It only has +# # effect in rules that affect the reply data stream such as +# # http_reply_access. +# +# Examples: +# acl macaddress arp 09:00:2b:23:45:67 +# acl myexample dst_as 1241 +# acl password proxy_auth REQUIRED +# acl fileupload req_mime_type -i ^multipart/form-data$ +# acl javascript rep_mime_type -i ^application/x-javascript$ +# +#Default: +# ACLs all, manager, localhost, and to_localhost are predefined. +# +# +# Recommended minimum configuration: +# + +# Example rule allowing access from your local networks. +# Adapt to list your (internal) IP networks from where browsing +# should be allowed +acl localnet src 10.0.0.0/8 # RFC1918 possible internal network +acl localnet src 172.16.0.0/12 # RFC1918 possible internal network +acl localnet src 192.168.0.0/16 # RFC1918 possible internal network +acl localnet src fc00::/7 # RFC 4193 local private network range +acl localnet src fe80::/10 # RFC 4291 link-local (directly plugged) machines + +acl SSL_ports port 443 +acl Safe_ports port 80 # http +acl Safe_ports port 21 # ftp +acl Safe_ports port 443 # https +acl Safe_ports port 70 # gopher +acl Safe_ports port 210 # wais +acl Safe_ports port 1025-65535 # unregistered ports +acl Safe_ports port 280 # http-mgmt +acl Safe_ports port 488 # gss-http +acl Safe_ports port 591 # filemaker +acl Safe_ports port 777 # multiling http +acl CONNECT method CONNECT + +# TAG: follow_x_forwarded_for +# Allowing or Denying the X-Forwarded-For header to be followed to +# find the original source of a request. +# +# Requests may pass through a chain of several other proxies +# before reaching us. The X-Forwarded-For header will contain a +# comma-separated list of the IP addresses in the chain, with the +# rightmost address being the most recent. +# +# If a request reaches us from a source that is allowed by this +# configuration item, then we consult the X-Forwarded-For header +# to see where that host received the request from. If the +# X-Forwarded-For header contains multiple addresses, we continue +# backtracking until we reach an address for which we are not allowed +# to follow the X-Forwarded-For header, or until we reach the first +# address in the list. For the purpose of ACL used in the +# follow_x_forwarded_for directive the src ACL type always matches +# the address we are testing and srcdomain matches its rDNS. +# +# The end result of this process is an IP address that we will +# refer to as the indirect client address. This address may +# be treated as the client address for access control, ICAP, delay +# pools and logging, depending on the acl_uses_indirect_client, +# icap_uses_indirect_client, delay_pool_uses_indirect_client, +# log_uses_indirect_client and tproxy_uses_indirect_client options. +# +# This clause only supports fast acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. +# +# SECURITY CONSIDERATIONS: +# +# Any host for which we follow the X-Forwarded-For header +# can place incorrect information in the header, and Squid +# will use the incorrect information as if it were the +# source address of the request. This may enable remote +# hosts to bypass any access control restrictions that are +# based on the client's source addresses. +# +# For example: +# +# acl localhost src 127.0.0.1 +# acl my_other_proxy srcdomain .proxy.example.com +# follow_x_forwarded_for allow localhost +# follow_x_forwarded_for allow my_other_proxy +#Default: +# follow_x_forwarded_for deny all + +# TAG: acl_uses_indirect_client on|off +# Controls whether the indirect client address +# (see follow_x_forwarded_for) is used instead of the +# direct client address in acl matching. +# +# NOTE: maxconn ACL considers direct TCP links and indirect +# clients will always have zero. So no match. +#Default: +# acl_uses_indirect_client on + +# TAG: delay_pool_uses_indirect_client on|off +# Controls whether the indirect client address +# (see follow_x_forwarded_for) is used instead of the +# direct client address in delay pools. +#Default: +# delay_pool_uses_indirect_client on + +# TAG: log_uses_indirect_client on|off +# Controls whether the indirect client address +# (see follow_x_forwarded_for) is used instead of the +# direct client address in the access log. +#Default: +# log_uses_indirect_client on + +# TAG: tproxy_uses_indirect_client on|off +# Controls whether the indirect client address +# (see follow_x_forwarded_for) is used instead of the +# direct client address when spoofing the outgoing client. +# +# This has no effect on requests arriving in non-tproxy +# mode ports. +# +# SECURITY WARNING: Usage of this option is dangerous +# and should not be used trivially. Correct configuration +# of follow_x_forewarded_for with a limited set of trusted +# sources is required to prevent abuse of your proxy. +#Default: +# tproxy_uses_indirect_client off + +# TAG: http_access +# Allowing or Denying access based on defined access lists +# +# Access to the HTTP port: +# http_access allow|deny [!]aclname ... +# +# NOTE on default values: +# +# If there are no "access" lines present, the default is to deny +# the request. +# +# If none of the "access" lines cause a match, the default is the +# opposite of the last line in the list. If the last line was +# deny, the default is allow. Conversely, if the last line +# is allow, the default will be deny. For these reasons, it is a +# good idea to have an "deny all" entry at the end of your access +# lists to avoid potential confusion. +# +# This clause supports both fast and slow acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. +# +#Default: +# http_access deny all +# + +# +# Recommended minimum Access Permission configuration: +# +# Only allow cachemgr access from localhost +http_access allow localhost manager +http_access deny manager + +# Deny requests to certain unsafe ports +http_access deny !Safe_ports + +# Deny CONNECT to other than secure SSL ports +http_access deny CONNECT !SSL_ports + +# We strongly recommend the following be uncommented to protect innocent +# web applications running on the proxy server who think the only +# one who can access services on "localhost" is a local user +#http_access deny to_localhost + +# +# INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS +# + +# Example rule allowing access from your local networks. +# Adapt localnet in the ACL section to list your (internal) IP networks +# from where browsing should be allowed +http_access allow localnet +http_access allow localhost + +# And finally deny all other access to this proxy +http_access allow localhost + +# TAG: adapted_http_access +# Allowing or Denying access based on defined access lists +# +# Essentially identical to http_access, but runs after redirectors +# and ICAP/eCAP adaptation. Allowing access control based on their +# output. +# +# If not set then only http_access is used. +#Default: +# none -# WELCOME TO SQUID 2 -# ------------------ +# TAG: http_reply_access +# Allow replies to client requests. This is complementary to http_access. # -# This is the default Squid configuration file. You may wish -# to look at the Squid home page (http://www.squid-cache.org/) -# for the FAQ and other documentation. +# http_reply_access allow|deny [!] aclname ... # -# The default Squid config file shows what the defaults for -# various options happen to be. If you don't need to change the -# default, you shouldn't uncomment the line. Doing so may cause -# run-time problems. In some cases "none" refers to no default -# setting at all, while in other cases it refers to a valid -# option - the comments for that keyword indicate if this is the -# case. +# NOTE: if there are no access lines present, the default is to allow +# all replies # +# If none of the access lines cause a match the opposite of the +# last line will apply. Thus it is good practice to end the rules +# with an "allow all" or "deny all" entry. +# +# This clause supports both fast and slow acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. +#Default: +# none +# TAG: icp_access +# Allowing or Denying access to the ICP port based on defined +# access lists +# +# icp_access allow|deny [!]aclname ... +# +# See http_access for details +# +# This clause only supports fast acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. +# +## Allow ICP queries from local networks only +##icp_access allow localnet +##icp_access deny all +#Default: +# icp_access deny all + +# TAG: htcp_access +# Allowing or Denying access to the HTCP port based on defined +# access lists +# +# htcp_access allow|deny [!]aclname ... +# +# See http_access for details +# +# NOTE: The default if no htcp_access lines are present is to +# deny all traffic. This default may cause problems with peers +# using the htcp option. +# +# This clause only supports fast acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. +# +## Allow HTCP queries from local networks only +##htcp_access allow localnet +##htcp_access deny all +#Default: +# htcp_access deny all + +# TAG: htcp_clr_access +# Allowing or Denying access to purge content using HTCP based +# on defined access lists +# +# htcp_clr_access allow|deny [!]aclname ... +# +# See http_access for details +# +# This clause only supports fast acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. +# +## Allow HTCP CLR requests from trusted peers +#acl htcp_clr_peer src 172.16.1.2 +#htcp_clr_access allow htcp_clr_peer +#Default: +# htcp_clr_access deny all + +# TAG: miss_access +# Determins whether network access is permitted when satisfying a request. +# +# For example; +# to force your neighbors to use you as a sibling instead of +# a parent. +# +# acl localclients src 172.16.0.0/16 +# miss_access allow localclients +# miss_access deny !localclients +# +# This means only your local clients are allowed to fetch relayed/MISS +# replies from the network and all other clients can only fetch cached +# objects (HITs). +# +# +# The default for this setting allows all clients who passed the +# http_access rules to relay via this proxy. +# +# This clause only supports fast acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. +#Default: +# none + +# TAG: ident_lookup_access +# Note: This option is only available if Squid is rebuilt with the +# --enable-ident-lookups +# +# A list of ACL elements which, if matched, cause an ident +# (RFC 931) lookup to be performed for this request. For +# example, you might choose to always perform ident lookups +# for your main multi-user Unix boxes, but not for your Macs +# and PCs. By default, ident lookups are not performed for +# any requests. +# +# To enable ident lookups for specific client addresses, you +# can follow this example: +# +# acl ident_aware_hosts src 198.168.1.0/24 +# ident_lookup_access allow ident_aware_hosts +# ident_lookup_access deny all +# +# Only src type ACL checks are fully supported. A srcdomain +# ACL might work at times, but it will not always provide +# the correct result. +# +# This clause only supports fast acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. +#Default: +# ident_lookup_access deny all + +# TAG: reply_body_max_size size [acl acl...] +# This option specifies the maximum size of a reply body. It can be +# used to prevent users from downloading very large files, such as +# MP3's and movies. When the reply headers are received, the +# reply_body_max_size lines are processed, and the first line where +# all (if any) listed ACLs are true is used as the maximum body size +# for this reply. +# +# This size is checked twice. First when we get the reply headers, +# we check the content-length value. If the content length value exists +# and is larger than the allowed size, the request is denied and the +# user receives an error message that says "the request or reply +# is too large." If there is no content-length, and the reply +# size exceeds this limit, the client's connection is just closed +# and they will receive a partial reply. +# +# WARNING: downstream caches probably can not detect a partial reply +# if there is no content-length header, so they will cache +# partial responses and give them out as hits. You should NOT +# use this option if you have downstream caches. +# +# WARNING: A maximum size smaller than the size of squid's error messages +# will cause an infinite loop and crash squid. Ensure that the smallest +# non-zero value you use is greater that the maximum header size plus +# the size of your largest error page. +# +# If you set this parameter none (the default), there will be +# no limit imposed. +# +# Configuration Format is: +# reply_body_max_size SIZE UNITS [acl ...] +# ie. +# reply_body_max_size 10 MB +# +#Default: +# none # NETWORK OPTIONS # ----------------------------------------------------------------------------- # TAG: http_port -# Usage: port -# hostname:port -# 1.2.3.4:port +# Usage: port [mode] [options] +# hostname:port [mode] [options] +# 1.2.3.4:port [mode] [options] # # The socket addresses where Squid will listen for HTTP client # requests. You may specify multiple socket addresses. # There are three forms: port alone, hostname with port, and # IP address with port. If you specify a hostname or IP -# address, then Squid binds the socket to that specific -# address. This replaces the old 'tcp_incoming_address' -# option. Most likely, you do not need to bind to a specific +# address, Squid binds the socket to that specific +# address. Most likely, you do not need to bind to a specific # address, so you can use the port number alone. # -# The default port number is 3128. -# -# If you are running Squid in accelerator mode, then you +# If you are running Squid in accelerator mode, you # probably want to listen on port 80 also, or instead. # -# The -a command line option will override the *first* port -# number listed here. That option will NOT override an IP -# address, however. +# The -a command line option may be used to specify additional +# port(s) where Squid listens for proxy request. Such ports will +# be plain proxy ports with no options. # # You may specify multiple socket addresses on multiple lines. # +# Modes: +# +# intercept Support for IP-Layer interception of +# outgoing requests without browser settings. +# NP: disables authentication and IPv6 on the port. +# +# tproxy Support Linux TPROXY for spoofing outgoing +# connections using the client IP address. +# NP: disables authentication and maybe IPv6 on the port. +# +# accel Accelerator / reverse proxy mode +# +# ssl-bump Intercept each CONNECT request matching ssl_bump ACL, +# establish secure connection with the client and with +# the server, decrypt HTTP messages as they pass through +# Squid, and treat them as unencrypted HTTP messages, +# becoming the man-in-the-middle. +# +# The ssl_bump option is required to fully enable +# the SslBump feature. +# +# Omitting the mode flag causes default forward proxy mode to be used. +# +# +# Accelerator Mode Options: +# +# defaultsite=domainname +# What to use for the Host: header if it is not present +# in a request. Determines what site (not origin server) +# accelerators should consider the default. +# +# no-vhost Disable using HTTP/1.1 Host header for virtual domain support. +# +# protocol= Protocol to reconstruct accelerated requests with. +# Defaults to http for http_port and https for +# https_port +# +# vport Virtual host port support. Using the http_port number +# instead of the port passed on Host: headers. +# +# vport=NN Virtual host port support. Using the specified port +# number instead of the port passed on Host: headers. +# +# act-as-origin +# Act as if this Squid is the origin server. +# This currently means generate new Date: and Expires: +# headers on HIT instead of adding Age:. +# +# ignore-cc Ignore request Cache-Control headers. +# +# WARNING: This option violates HTTP specifications if +# used in non-accelerator setups. +# +# allow-direct Allow direct forwarding in accelerator mode. Normally +# accelerated requests are denied direct forwarding as if +# never_direct was used. +# +# WARNING: this option opens accelerator mode to security +# vulnerabilities usually only affecting in interception +# mode. Make sure to protect forwarding with suitable +# http_access rules when using this. +# +# +# SSL Bump Mode Options: +# In addition to these options ssl-bump requires TLS/SSL options. +# +# generate-host-certificates[=<on|off>] +# Dynamically create SSL server certificates for the +# destination hosts of bumped CONNECT requests.When +# enabled, the cert and key options are used to sign +# generated certificates. Otherwise generated +# certificate will be selfsigned. +# If there is a CA certificate lifetime of the generated +# certificate equals lifetime of the CA certificate. If +# generated certificate is selfsigned lifetime is three +# years. +# This option is enabled by default when ssl-bump is used. +# See the ssl-bump option above for more information. +# +# dynamic_cert_mem_cache_size=SIZE +# Approximate total RAM size spent on cached generated +# certificates. If set to zero, caching is disabled. The +# default value is 4MB. An average XXX-bit certificate +# consumes about XXX bytes of RAM. +# +# TLS / SSL Options: +# +# cert= Path to SSL certificate (PEM format). +# +# key= Path to SSL private key file (PEM format) +# if not specified, the certificate file is +# assumed to be a combined certificate and +# key file. +# +# version= The version of SSL/TLS supported +# 1 automatic (default) +# 2 SSLv2 only +# 3 SSLv3 only +# 4 TLSv1.0 only +# 5 TLSv1.1 only +# 6 TLSv1.2 only +# +# cipher= Colon separated list of supported ciphers. +# NOTE: some ciphers such as EDH ciphers depend on +# additional settings. If those settings are +# omitted the ciphers may be silently ignored +# by the OpenSSL library. +# +# options= Various SSL implementation options. The most important +# being: +# NO_SSLv2 Disallow the use of SSLv2 +# NO_SSLv3 Disallow the use of SSLv3 +# NO_TLSv1 Disallow the use of TLSv1.0 +# NO_TLSv1_1 Disallow the use of TLSv1.1 +# NO_TLSv1_2 Disallow the use of TLSv1.2 +# SINGLE_DH_USE Always create a new key when using +# temporary/ephemeral DH key exchanges +# ALL Enable various bug workarounds +# suggested as "harmless" by OpenSSL +# Be warned that this reduces SSL/TLS +# strength to some attacks. +# See OpenSSL SSL_CTX_set_options documentation for a +# complete list of options. +# +# clientca= File containing the list of CAs to use when +# requesting a client certificate. +# +# cafile= File containing additional CA certificates to +# use when verifying client certificates. If unset +# clientca will be used. +# +# capath= Directory containing additional CA certificates +# and CRL lists to use when verifying client certificates. +# +# crlfile= File of additional CRL lists to use when verifying +# the client certificate, in addition to CRLs stored in +# the capath. Implies VERIFY_CRL flag below. +# +# dhparams= File containing DH parameters for temporary/ephemeral +# DH key exchanges. See OpenSSL documentation for details +# on how to create this file. +# WARNING: EDH ciphers will be silently disabled if this +# option is not set. +# +# sslflags= Various flags modifying the use of SSL: +# DELAYED_AUTH +# Don't request client certificates +# immediately, but wait until acl processing +# requires a certificate (not yet implemented). +# NO_DEFAULT_CA +# Don't use the default CA lists built in +# to OpenSSL. +# NO_SESSION_REUSE +# Don't allow for session reuse. Each connection +# will result in a new SSL session. +# VERIFY_CRL +# Verify CRL lists when accepting client +# certificates. +# VERIFY_CRL_ALL +# Verify CRL lists for all certificates in the +# client certificate chain. +# +# sslcontext= SSL session ID context identifier. +# +# Other Options: +# +# connection-auth[=on|off] +# use connection-auth=off to tell Squid to prevent +# forwarding Microsoft connection oriented authentication +# (NTLM, Negotiate and Kerberos) +# +# disable-pmtu-discovery= +# Control Path-MTU discovery usage: +# off lets OS decide on what to do (default). +# transparent disable PMTU discovery when transparent +# support is enabled. +# always disable always PMTU discovery. +# +# In many setups of transparently intercepting proxies +# Path-MTU discovery can not work on traffic towards the +# clients. This is the case when the intercepting device +# does not fully track connections and fails to forward +# ICMP must fragment messages to the cache server. If you +# have such setup and experience that certain clients +# sporadically hang or never complete requests set +# disable-pmtu-discovery option to 'transparent'. +# +# name= Specifies a internal name for the port. Defaults to +# the port specification (port or addr:port) +# +# tcpkeepalive[=idle,interval,timeout] +# Enable TCP keepalive probes of idle connections. +# In seconds; idle is the initial time before TCP starts +# probing the connection, interval how often to probe, and +# timeout the time before giving up. +# +# If you run Squid on a dual-homed machine with an internal +# and an external interface we recommend you to specify the +# internal address:port in http_port. This way Squid will only be +# visible on the internal address. +# +# + +# Squid normally listens to port 3128 +http_port 3128 + +# TAG: https_port +# Usage: [ip:]port cert=certificate.pem [key=key.pem] [mode] [options...] +# +# The socket address where Squid will listen for client requests made +# over TLS or SSL connections. Commonly referred to as HTTPS. +# +# This is most useful for situations where you are running squid in +# accelerator mode and you want to do the SSL work at the accelerator level. +# +# You may specify multiple socket addresses on multiple lines, +# each with their own SSL certificate and/or options. +# +# See http_port for a list of available options. #Default: -# http_port 3128 +# none -# TAG: icp_port -# The port number where Squid sends and receives ICP queries to -# and from neighbor caches. Default is 3130. To disable use -# "0". May be overridden with -u on the command line. +# TAG: tcp_outgoing_tos +# Allows you to select a TOS/Diffserv value for packets outgoing +# on the server side, based on an ACL. +# +# tcp_outgoing_tos ds-field [!]aclname ... +# +# Example where normal_service_net uses the TOS value 0x00 +# and good_service_net uses 0x20 +# +# acl normal_service_net src 10.0.0.0/24 +# acl good_service_net src 10.0.1.0/24 +# tcp_outgoing_tos 0x00 normal_service_net +# tcp_outgoing_tos 0x20 good_service_net +# +# TOS/DSCP values really only have local significance - so you should +# know what you're specifying. For more information, see RFC2474, +# RFC2475, and RFC3260. # +# The TOS/DSCP byte must be exactly that - a octet value 0 - 255, or +# "default" to use whatever default your host has. Note that in +# practice often only multiples of 4 is usable as the two rightmost bits +# have been redefined for use by ECN (RFC 3168 section 23.1). +# +# Processing proceeds in the order specified, and stops at first fully +# matching line. #Default: -# icp_port 3130 +# none -# TAG: htcp_port -# The port number where Squid sends and receives HTCP queries to -# and from neighbor caches. Default is 4827. To disable use -# "0". +# TAG: clientside_tos +# Allows you to select a TOS/Diffserv value for packets being transmitted +# on the client-side, based on an ACL. +# +# clientside_tos ds-field [!]aclname ... # -# To enable this option, you must use --enable-htcp with the -# configure script. +# Example where normal_service_net uses the TOS value 0x00 +# and good_service_net uses 0x20 # +# acl normal_service_net src 10.0.0.0/24 +# acl good_service_net src 10.0.1.0/24 +# clientside_tos 0x00 normal_service_net +# clientside_tos 0x20 good_service_net +# +# Note: This feature is incompatible with qos_flows. Any TOS values set here +# will be overwritten by TOS values in qos_flows. #Default: -# htcp_port 4827 +# none -# TAG: mcast_groups -# This tag specifies a list of multicast groups which your server -# should join to receive multicasted ICP queries. +# TAG: tcp_outgoing_mark +# Note: This option is only available if Squid is rebuilt with the +# Packet MARK (Linux) # -# NOTE! Be very careful what you put here! Be sure you -# understand the difference between an ICP _query_ and an ICP -# _reply_. This option is to be set only if you want to RECEIVE -# multicast queries. Do NOT set this option to SEND multicast -# ICP (use cache_peer for that). ICP replies are always sent via -# unicast, so this option does not affect whether or not you will -# receive replies from multicast group members. +# Allows you to apply a Netfilter mark value to outgoing packets +# on the server side, based on an ACL. # -# You must be very careful to NOT use a multicast address which -# is already in use by another group of caches. +# tcp_outgoing_mark mark-value [!]aclname ... # -# If you are unsure about multicast, please read the Multicast -# chapter in the Squid FAQ (http://www.squid-cache.org/FAQ/). +# Example where normal_service_net uses the mark value 0x00 +# and good_service_net uses 0x20 # -# Usage: mcast_groups 239.128.16.128 224.0.1.20 +# acl normal_service_net src 10.0.0.0/24 +# acl good_service_net src 10.0.1.0/24 +# tcp_outgoing_mark 0x00 normal_service_net +# tcp_outgoing_mark 0x20 good_service_net +#Default: +# none + +# TAG: clientside_mark +# Note: This option is only available if Squid is rebuilt with the +# Packet MARK (Linux) # -# By default, Squid doesn't listen on any multicast groups. +# Allows you to apply a Netfilter mark value to packets being transmitted +# on the client-side, based on an ACL. +# +# clientside_mark mark-value [!]aclname ... +# +# Example where normal_service_net uses the mark value 0x00 +# and good_service_net uses 0x20 +# +# acl normal_service_net src 10.0.0.0/24 +# acl good_service_net src 10.0.1.0/24 +# clientside_mark 0x00 normal_service_net +# clientside_mark 0x20 good_service_net +# +# Note: This feature is incompatible with qos_flows. Any mark values set here +# will be overwritten by mark values in qos_flows. +#Default: +# none + +# TAG: qos_flows +# Allows you to select a TOS/DSCP value to mark outgoing +# connections with, based on where the reply was sourced. For +# platforms using netfilter, allows you to set a netfilter mark +# value instead of, or in addition to, a TOS value. +# +# TOS values really only have local significance - so you should +# know what you're specifying. For more information, see RFC2474, +# RFC2475, and RFC3260. +# +# The TOS/DSCP byte must be exactly that - a octet value 0 - 255. Note that +# in practice often only multiples of 4 is usable as the two rightmost bits +# have been redefined for use by ECN (RFC 3168 section 23.1). +# +# Mark values can be any unsigned 32-bit integer value. +# +# This setting is configured by setting the following values: +# +# tos|mark Whether to set TOS or netfilter mark values +# +# local-hit=0xFF Value to mark local cache hits. +# +# sibling-hit=0xFF Value to mark hits from sibling peers. +# +# parent-hit=0xFF Value to mark hits from parent peers. +# +# miss=0xFF[/mask] Value to mark cache misses. Takes precedence +# over the preserve-miss feature (see below), unless +# mask is specified, in which case only the bits +# specified in the mask are written. +# +# The TOS variant of the following features are only possible on Linux +# and require your kernel to be patched with the TOS preserving ZPH +# patch, available from http://zph.bratcheda.org +# No patch is needed to preserve the netfilter mark, which will work +# with all variants of netfilter. +# +# disable-preserve-miss +# This option disables the preservation of the TOS or netfilter +# mark. By default, the existing TOS or netfilter mark value of +# the response coming from the remote server will be retained +# and masked with miss-mark. +# NOTE: in the case of a netfilter mark, the mark must be set on +# the connection (using the CONNMARK target) not on the packet +# (MARK target). +# +# miss-mask=0xFF +# Allows you to mask certain bits in the TOS or mark value +# received from the remote server, before copying the value to +# the TOS sent towards clients. +# Default for tos: 0xFF (TOS from server is not changed). +# Default for mark: 0xFFFFFFFF (mark from server is not changed). +# +# All of these features require the --enable-zph-qos compilation flag +# (enabled by default). Netfilter marking also requires the +# libnetfilter_conntrack libraries (--with-netfilter-conntrack) and +# libcap 2.09+ (--with-libcap). # #Default: # none # TAG: tcp_outgoing_address -# TAG: udp_incoming_address -# TAG: udp_outgoing_address -# Usage: tcp_incoming_address 10.20.30.40 -# udp_outgoing_address fully.qualified.domain.name -# -# tcp_outgoing_address is used for connections made to remote -# servers and other caches. -# udp_incoming_address is used for the ICP socket receiving packets -# from other caches. -# udp_outgoing_address is used for ICP packets sent out to other -# caches. +# Allows you to map requests to different outgoing IP addresses +# based on the username or source address of the user making +# the request. # -# The default behavior is to not bind to any specific address. +# tcp_outgoing_address ipaddr [[!]aclname] ... # -# A *_incoming_address value of 0.0.0.0 indicates that Squid should -# listen on all available interfaces. +# For example; +# Forwarding clients with dedicated IPs for certain subnets. # -# If udp_outgoing_address is set to 255.255.255.255 (the default) -# then it will use the same socket as udp_incoming_address. Only -# change this if you want to have ICP queries sent using another -# address than where this Squid listens for ICP queries from other -# caches. +# acl normal_service_net src 10.0.0.0/24 +# acl good_service_net src 10.0.2.0/24 # -# NOTE, udp_incoming_address and udp_outgoing_address can not -# have the same value since they both use port 3130. +# tcp_outgoing_address 2001:db8::c001 good_service_net +# tcp_outgoing_address 10.1.0.2 good_service_net +# +# tcp_outgoing_address 2001:db8::beef normal_service_net +# tcp_outgoing_address 10.1.0.1 normal_service_net +# +# tcp_outgoing_address 2001:db8::1 +# tcp_outgoing_address 10.1.0.3 # -# NOTE, tcp_incoming_address has been removed. You can now -# specify IP addresses on the 'http_port' line. +# Processing proceeds in the order specified, and stops at first fully +# matching line. # +# Squid will add an implicit IP version test to each line. +# Requests going to IPv4 websites will use the outgoing 10.1.0.* addresses. +# Requests going to IPv6 websites will use the outgoing 2001:db8:* addresses. +# +# +# NOTE: The use of this directive using client dependent ACLs is +# incompatible with the use of server side persistent connections. To +# ensure correct results it is best to set server_persistent_connections +# to off when using this directive in such configurations. +# +# NOTE: The use of this directive to set a local IP on outgoing TCP links +# is incompatible with using TPROXY to set client IP out outbound TCP links. +# When needing to contact peers use the no-tproxy cache_peer option and the +# client_dst_passthru directive re-enable normal forwarding such as this. +# +#Default: +# none + +# TAG: host_verify_strict +# Regardless of this option setting, when dealing with intercepted +# traffic, Squid always verifies that the destination IP address matches +# the Host header domain or IP (called 'authority form URL'). +# +# This enforcement is performed to satisfy a MUST-level requirement in +# RFC 2616 section 14.23: "The Host field value MUST represent the naming +# authority of the origin server or gateway given by the original URL". +# +# When set to ON: +# Squid always responds with an HTTP 409 (Conflict) error +# page and logs a security warning if there is no match. +# +# Squid verifies that the destination IP address matches +# the Host header for forward-proxy and reverse-proxy traffic +# as well. For those traffic types, Squid also enables the +# following checks, comparing the corresponding Host header +# and Request-URI components: +# +# * The host names (domain or IP) must be identical, +# but valueless or missing Host header disables all checks. +# For the two host names to match, both must be either IP +# or FQDN. +# +# * Port numbers must be identical, but if a port is missing +# the scheme-default port is assumed. +# +# +# When set to OFF (the default): +# Squid allows suspicious requests to continue but logs a +# security warning and blocks caching of the response. +# +# * Forward-proxy traffic is not checked at all. +# +# * Reverse-proxy traffic is not checked at all. +# +# * Intercepted traffic which passes verification is handled +# according to client_dst_passthru. +# +# * Intercepted requests which fail verification are sent +# to the client original destination instead of DIRECT. +# This overrides 'client_dst_passthru off'. +# +# For now suspicious intercepted CONNECT requests are always +# responded to with an HTTP 409 (Conflict) error page. +# +# +# SECURITY NOTE: +# +# As described in CVE-2009-0801 when the Host: header alone is used +# to determine the destination of a request it becomes trivial for +# malicious scripts on remote websites to bypass browser same-origin +# security policy and sandboxing protections. +# +# The cause of this is that such applets are allowed to perform their +# own HTTP stack, in which case the same-origin policy of the browser +# sandbox only verifies that the applet tries to contact the same IP +# as from where it was loaded at the IP level. The Host: header may +# be different from the connected IP and approved origin. +# +#Default: +# host_verify_strict off + +# TAG: client_dst_passthru +# With NAT or TPROXY intercepted traffic Squid may pass the request +# directly to the original client destination IP or seek a faster +# source using the HTTP Host header. +# +# Using Host to locate alternative servers can provide faster +# connectivity with a range of failure recovery options. +# But can also lead to connectivity trouble when the client and +# server are attempting stateful interactions unaware of the proxy. +# +# This option (on by default) prevents alternative DNS entries being +# located to send intercepted traffic DIRECT to an origin server. +# The clients original destination IP and port will be used instead. +# +# Regardless of this option setting, when dealing with intercepted +# traffic Squid will verify the Host: header and any traffic which +# fails Host verification will be treated as if this option were ON. +# +# see host_verify_strict for details on the verification process. #Default: -# tcp_outgoing_address 255.255.255.255 -# udp_incoming_address 0.0.0.0 -# udp_outgoing_address 255.255.255.255 +# client_dst_passthru on +# SSL OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: ssl_unclean_shutdown +# Some browsers (especially MSIE) bugs out on SSL shutdown +# messages. +#Default: +# ssl_unclean_shutdown off + +# TAG: ssl_engine +# The OpenSSL engine to use. You will need to set this if you +# would like to use hardware SSL acceleration for example. +#Default: +# none + +# TAG: sslproxy_client_certificate +# Client SSL Certificate to use when proxying https:// URLs +#Default: +# none + +# TAG: sslproxy_client_key +# Client SSL Key to use when proxying https:// URLs +#Default: +# none + +# TAG: sslproxy_version +# SSL version level to use when proxying https:// URLs +# +# The versions of SSL/TLS supported: +# +# 1 automatic (default) +# 2 SSLv2 only +# 3 SSLv3 only +# 4 TLSv1.0 only +# 5 TLSv1.1 only +# 6 TLSv1.2 only +#Default: +# sslproxy_version 1 + +# TAG: sslproxy_options +# SSL implementation options to use when proxying https:// URLs +# +# The most important being: +# +# NO_SSLv2 Disallow the use of SSLv2 +# NO_SSLv3 Disallow the use of SSLv3 +# NO_TLSv1 Disallow the use of TLSv1.0 +# NO_TLSv1_1 Disallow the use of TLSv1.1 +# NO_TLSv1_2 Disallow the use of TLSv1.2 +# SINGLE_DH_USE +# Always create a new key when using temporary/ephemeral +# DH key exchanges +# SSL_OP_NO_TICKET +# Disable use of RFC5077 session tickets. Some servers +# may have problems understanding the TLS extension due +# to ambiguous specification in RFC4507. +# ALL Enable various bug workarounds suggested as "harmless" +# by OpenSSL. Be warned that this may reduce SSL/TLS +# strength to some attacks. +# +# See the OpenSSL SSL_CTX_set_options documentation for a +# complete list of possible options. +#Default: +# none + +# TAG: sslproxy_cipher +# SSL cipher list to use when proxying https:// URLs +# +# Colon separated list of supported ciphers. +#Default: +# none + +# TAG: sslproxy_cafile +# file containing CA certificates to use when verifying server +# certificates while proxying https:// URLs +#Default: +# none + +# TAG: sslproxy_capath +# directory containing CA certificates to use when verifying +# server certificates while proxying https:// URLs +#Default: +# none + +# TAG: ssl_bump +# This ACL controls which CONNECT requests to an http_port +# marked with an sslBump flag are actually "bumped". Please +# see the sslBump flag of an http_port option for more details +# about decoding proxied SSL connections. +# +# By default, no requests are bumped. +# +# See also: http_port ssl-bump +# +# This clause supports both fast and slow acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. +# +# +# # Example: Bump all requests except those originating from localhost and +# # those going to webax.com or example.com sites. +# +# acl localhost src 127.0.0.1/32 +# acl broken_sites dstdomain .webax.com +# acl broken_sites dstdomain .example.com +# ssl_bump deny localhost +# ssl_bump deny broken_sites +# ssl_bump allow all +#Default: +# none + +# TAG: sslproxy_flags +# Various flags modifying the use of SSL while proxying https:// URLs: +# DONT_VERIFY_PEER Accept certificates that fail verification. +# For refined control, see sslproxy_cert_error. +# NO_DEFAULT_CA Don't use the default CA list built in +# to OpenSSL. +#Default: +# none + +# TAG: sslproxy_cert_error +# Use this ACL to bypass server certificate validation errors. +# +# For example, the following lines will bypass all validation errors +# when talking to servers for example.com. All other +# validation errors will result in ERR_SECURE_CONNECT_FAIL error. +# +# acl BrokenButTrustedServers dstdomain example.com +# sslproxy_cert_error allow BrokenButTrustedServers +# sslproxy_cert_error deny all +# +# This clause only supports fast acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. +# Using slow acl types may result in server crashes +# +# Without this option, all server certificate validation errors +# terminate the transaction. Bypassing validation errors is dangerous +# because an error usually implies that the server cannot be trusted and +# the connection may be insecure. +# +# See also: sslproxy_flags and DONT_VERIFY_PEER. +# +# Default setting: sslproxy_cert_error deny all +#Default: +# none + +# TAG: sslpassword_program +# Specify a program used for entering SSL key passphrases +# when using encrypted SSL certificate keys. If not specified +# keys must either be unencrypted, or Squid started with the -N +# option to allow it to query interactively for the passphrase. +# +# The key file name is given as argument to the program allowing +# selection of the right password if you have multiple encrypted +# keys. +#Default: +# none + +# OPTIONS RELATING TO EXTERNAL SSL_CRTD +# ----------------------------------------------------------------------------- + +# TAG: sslcrtd_program +# Note: This option is only available if Squid is rebuilt with the +# --enable-ssl-crtd +# +# Specify the location and options of the executable for ssl_crtd process. +# /usr/lib64/squid/ssl_crtd program requires -s and -M parameters +# For more information use: +# /usr/lib64/squid/ssl_crtd -h +#Default: +# sslcrtd_program /usr/lib64/squid/ssl_crtd -s /var/lib/ssl_db -M 4MB + +# TAG: sslcrtd_children +# Note: This option is only available if Squid is rebuilt with the +# --enable-ssl-crtd +# +# The maximum number of processes spawn to service ssl server. +# The maximum this may be safely set to is 32. +# +# The startup= and idle= options allow some measure of skew in your +# tuning. +# +# startup=N +# +# Sets the minimum number of processes to spawn when Squid +# starts or reconfigures. When set to zero the first request will +# cause spawning of the first child process to handle it. +# +# Starting too few children temporary slows Squid under load while it +# tries to spawn enough additional processes to cope with traffic. +# +# idle=N +# +# Sets a minimum of how many processes Squid is to try and keep available +# at all times. When traffic begins to rise above what the existing +# processes can handle this many more will be spawned up to the maximum +# configured. A minimum setting of 1 is required. +# +# You must have at least one ssl_crtd process. +#Default: +# sslcrtd_children 32 startup=5 idle=1 # OPTIONS WHICH AFFECT THE NEIGHBOR SELECTION ALGORITHM # ----------------------------------------------------------------------------- # TAG: cache_peer # To specify other caches in a hierarchy, use the format: -# -# cache_peer hostname type http_port icp_port -# +# +# cache_peer hostname type http-port icp-port [options] +# # For example, -# +# # # proxy icp # # hostname type port port options # # -------------------- -------- ----- ----- ----------- -# cache_peer parent.foo.net parent 3128 3130 [proxy-only] -# cache_peer sib1.foo.net sibling 3128 3130 [proxy-only] -# cache_peer sib2.foo.net sibling 3128 3130 [proxy-only] -# -# type: either 'parent', 'sibling', or 'multicast'. -# -# proxy_port: The port number where the cache listens for proxy -# requests. -# -# icp_port: Used for querying neighbor caches about -# objects. To have a non-ICP neighbor -# specify '7' for the ICP port and make sure the -# neighbor machine has the UDP echo port -# enabled in its /etc/inetd.conf file. -# -# options: proxy-only -# weight=n -# ttl=n -# no-query -# default -# round-robin -# multicast-responder -# closest-only -# no-digest -# no-netdb-exchange -# no-delay -# login=user:password -# connect-timeout=nn -# digest-url=url -# allow-miss -# -# use 'proxy-only' to specify that objects fetched -# from this cache should not be saved locally. -# -# use 'weight=n' to specify a weighted parent. -# The weight must be an integer. The default weight -# is 1, larger weights are favored more. -# -# use 'ttl=n' to specify a IP multicast TTL to use -# when sending an ICP queries to this address. -# Only useful when sending to a multicast group. -# Because we don't accept ICP replies from random -# hosts, you must configure other group members as -# peers with the 'multicast-responder' option below. -# -# use 'no-query' to NOT send ICP queries to this -# neighbor. -# -# use 'default' if this is a parent cache which can -# be used as a "last-resort." You should probably -# only use 'default' in situations where you cannot -# use ICP with your parent cache(s). -# -# use 'round-robin' to define a set of parents which -# should be used in a round-robin fashion in the -# absence of any ICP queries. -# -# 'multicast-responder' indicates that the named peer -# is a member of a multicast group. ICP queries will -# not be sent directly to the peer, but ICP replies -# will be accepted from it. -# -# 'closest-only' indicates that, for ICP_OP_MISS -# replies, we'll only forward CLOSEST_PARENT_MISSes -# and never FIRST_PARENT_MISSes. -# -# use 'no-digest' to NOT request cache digests from -# this neighbor. -# -# 'no-netdb-exchange' disables requesting ICMP -# RTT database (NetDB) from the neighbor. -# -# use 'no-delay' to prevent access to this neighbor -# from influencing the delay pools. -# -# use 'login=user:password' if this is a personal/workgroup -# proxy and your parent requires proxy authentication. -# -# use 'connect-timeout=nn' to specify a peer -# specific connect timeout (also see the -# peer_connect_timeout directive) -# -# use 'digest-url=url' to tell Squid to fetch the cache -# digest (if digests are enabled) for this host from -# the specified URL rather than the Squid default -# location. -# -# use 'allow-miss' to disable Squid's use of only-if-cached -# when forwarding requests to siblings. This is primarily -# useful when icp_hit_stale is used by the sibling. To -# extensive use of this option may result in forwarding -# loops, and you should avoid having two-way peerings -# with this option. (for example to deny peer usage on -# requests from peer by denying cache_peer_access if the -# source is a peer) -# -# NOTE: non-ICP neighbors must be specified as 'parent'. -# +# cache_peer parent.foo.net parent 3128 3130 default +# cache_peer sib1.foo.net sibling 3128 3130 proxy-only +# cache_peer sib2.foo.net sibling 3128 3130 proxy-only +# cache_peer example.com parent 80 0 default +# cache_peer cdn.example.com sibling 3128 0 +# +# type: either 'parent', 'sibling', or 'multicast'. +# +# proxy-port: The port number where the peer accept HTTP requests. +# For other Squid proxies this is usually 3128 +# For web servers this is usually 80 +# +# icp-port: Used for querying neighbor caches about objects. +# Set to 0 if the peer does not support ICP or HTCP. +# See ICP and HTCP options below for additional details. +# +# +# ==== ICP OPTIONS ==== +# +# You MUST also set icp_port and icp_access explicitly when using these options. +# The defaults will prevent peer traffic using ICP. +# +# +# no-query Disable ICP queries to this neighbor. +# +# multicast-responder +# Indicates the named peer is a member of a multicast group. +# ICP queries will not be sent directly to the peer, but ICP +# replies will be accepted from it. +# +# closest-only Indicates that, for ICP_OP_MISS replies, we'll only forward +# CLOSEST_PARENT_MISSes and never FIRST_PARENT_MISSes. +# +# background-ping +# To only send ICP queries to this neighbor infrequently. +# This is used to keep the neighbor round trip time updated +# and is usually used in conjunction with weighted-round-robin. +# +# +# ==== HTCP OPTIONS ==== +# +# You MUST also set htcp_port and htcp_access explicitly when using these options. +# The defaults will prevent peer traffic using HTCP. +# +# +# htcp Send HTCP, instead of ICP, queries to the neighbor. +# You probably also want to set the "icp-port" to 4827 +# instead of 3130. This directive accepts a comma separated +# list of options described below. +# +# htcp=oldsquid Send HTCP to old Squid versions (2.5 or earlier). +# +# htcp=no-clr Send HTCP to the neighbor but without +# sending any CLR requests. This cannot be used with +# only-clr. +# +# htcp=only-clr Send HTCP to the neighbor but ONLY CLR requests. +# This cannot be used with no-clr. +# +# htcp=no-purge-clr +# Send HTCP to the neighbor including CLRs but only when +# they do not result from PURGE requests. +# +# htcp=forward-clr +# Forward any HTCP CLR requests this proxy receives to the peer. +# +# +# ==== PEER SELECTION METHODS ==== +# +# The default peer selection method is ICP, with the first responding peer +# being used as source. These options can be used for better load balancing. +# +# +# default This is a parent cache which can be used as a "last-resort" +# if a peer cannot be located by any of the peer-selection methods. +# If specified more than once, only the first is used. +# +# round-robin Load-Balance parents which should be used in a round-robin +# fashion in the absence of any ICP queries. +# weight=N can be used to add bias. +# +# weighted-round-robin +# Load-Balance parents which should be used in a round-robin +# fashion with the frequency of each parent being based on the +# round trip time. Closer parents are used more often. +# Usually used for background-ping parents. +# weight=N can be used to add bias. +# +# carp Load-Balance parents which should be used as a CARP array. +# The requests will be distributed among the parents based on the +# CARP load balancing hash function based on their weight. +# +# userhash Load-balance parents based on the client proxy_auth or ident username. +# +# sourcehash Load-balance parents based on the client source IP. +# +# multicast-siblings +# To be used only for cache peers of type "multicast". +# ALL members of this multicast group have "sibling" +# relationship with it, not "parent". This is to a multicast +# group when the requested object would be fetched only from +# a "parent" cache, anyway. It's useful, e.g., when +# configuring a pool of redundant Squid proxies, being +# members of the same multicast group. +# +# +# ==== PEER SELECTION OPTIONS ==== +# +# weight=N use to affect the selection of a peer during any weighted +# peer-selection mechanisms. +# The weight must be an integer; default is 1, +# larger weights are favored more. +# This option does not affect parent selection if a peering +# protocol is not in use. +# +# basetime=N Specify a base amount to be subtracted from round trip +# times of parents. +# It is subtracted before division by weight in calculating +# which parent to fectch from. If the rtt is less than the +# base time the rtt is set to a minimal value. +# +# ttl=N Specify a TTL to use when sending multicast ICP queries +# to this address. +# Only useful when sending to a multicast group. +# Because we don't accept ICP replies from random +# hosts, you must configure other group members as +# peers with the 'multicast-responder' option. +# +# no-delay To prevent access to this neighbor from influencing the +# delay pools. +# +# digest-url=URL Tell Squid to fetch the cache digest (if digests are +# enabled) for this host from the specified URL rather +# than the Squid default location. +# +# +# ==== CARP OPTIONS ==== +# +# carp-key=key-specification +# use a different key than the full URL to hash against the peer. +# the key-specification is a comma-separated list of the keywords +# scheme, host, port, path, params +# Order is not important. +# +# ==== ACCELERATOR / REVERSE-PROXY OPTIONS ==== +# +# originserver Causes this parent to be contacted as an origin server. +# Meant to be used in accelerator setups when the peer +# is a web server. +# +# forceddomain=name +# Set the Host header of requests forwarded to this peer. +# Useful in accelerator setups where the server (peer) +# expects a certain domain name but clients may request +# others. ie example.com or www.example.com +# +# no-digest Disable request of cache digests. +# +# no-netdb-exchange +# Disables requesting ICMP RTT database (NetDB). +# +# +# ==== AUTHENTICATION OPTIONS ==== +# +# login=user:password +# If this is a personal/workgroup proxy and your parent +# requires proxy authentication. +# +# Note: The string can include URL escapes (i.e. %20 for +# spaces). This also means % must be written as %%. +# +# login=PASSTHRU +# Send login details received from client to this peer. +# Both Proxy- and WWW-Authorization headers are passed +# without alteration to the peer. +# Authentication is not required by Squid for this to work. +# +# Note: This will pass any form of authentication but +# only Basic auth will work through a proxy unless the +# connection-auth options are also used. +# +# login=PASS Send login details received from client to this peer. +# Authentication is not required by this option. +# +# If there are no client-provided authentication headers +# to pass on, but username and password are available +# from an external ACL user= and password= result tags +# they may be sent instead. +# +# Note: To combine this with proxy_auth both proxies must +# share the same user database as HTTP only allows for +# a single login (one for proxy, one for origin server). +# Also be warned this will expose your users proxy +# password to the peer. USE WITH CAUTION +# +# login=*:password +# Send the username to the upstream cache, but with a +# fixed password. This is meant to be used when the peer +# is in another administrative domain, but it is still +# needed to identify each user. +# The star can optionally be followed by some extra +# information which is added to the username. This can +# be used to identify this proxy to the peer, similar to +# the login=username:password option above. +# +# login=NEGOTIATE +# If this is a personal/workgroup proxy and your parent +# requires a secure proxy authentication. +# The first principal from the default keytab or defined by +# the environment variable KRB5_KTNAME will be used. +# +# WARNING: The connection may transmit requests from multiple +# clients. Negotiate often assumes end-to-end authentication +# and a single-client. Which is not strictly true here. +# +# login=NEGOTIATE:principal_name +# If this is a personal/workgroup proxy and your parent +# requires a secure proxy authentication. +# The principal principal_name from the default keytab or +# defined by the environment variable KRB5_KTNAME will be +# used. +# +# WARNING: The connection may transmit requests from multiple +# clients. Negotiate often assumes end-to-end authentication +# and a single-client. Which is not strictly true here. +# +# connection-auth=on|off +# Tell Squid that this peer does or not support Microsoft +# connection oriented authentication, and any such +# challenges received from there should be ignored. +# Default is auto to automatically determine the status +# of the peer. +# +# +# ==== SSL / HTTPS / TLS OPTIONS ==== +# +# ssl Encrypt connections to this peer with SSL/TLS. +# +# sslcert=/path/to/ssl/certificate +# A client SSL certificate to use when connecting to +# this peer. +# +# sslkey=/path/to/ssl/key +# The private SSL key corresponding to sslcert above. +# If 'sslkey' is not specified 'sslcert' is assumed to +# reference a combined file containing both the +# certificate and the key. +# +# sslversion=1|2|3|4|5|6 +# The SSL version to use when connecting to this peer +# 1 = automatic (default) +# 2 = SSL v2 only +# 3 = SSL v3 only +# 4 = TLS v1.0 only +# 5 = TLS v1.1 only +# 6 = TLS v1.2 only +# +# sslcipher=... The list of valid SSL ciphers to use when connecting +# to this peer. +# +# ssloptions=... Specify various SSL implementation options: +# +# NO_SSLv2 Disallow the use of SSLv2 +# NO_SSLv3 Disallow the use of SSLv3 +# NO_TLSv1 Disallow the use of TLSv1.0 +# NO_TLSv1_1 Disallow the use of TLSv1.1 +# NO_TLSv1_2 Disallow the use of TLSv1.2 +# SINGLE_DH_USE +# Always create a new key when using +# temporary/ephemeral DH key exchanges +# ALL Enable various bug workarounds +# suggested as "harmless" by OpenSSL +# Be warned that this reduces SSL/TLS +# strength to some attacks. +# +# See the OpenSSL SSL_CTX_set_options documentation for a +# more complete list. +# +# sslcafile=... A file containing additional CA certificates to use +# when verifying the peer certificate. +# +# sslcapath=... A directory containing additional CA certificates to +# use when verifying the peer certificate. +# +# sslcrlfile=... A certificate revocation list file to use when +# verifying the peer certificate. +# +# sslflags=... Specify various flags modifying the SSL implementation: +# +# DONT_VERIFY_PEER +# Accept certificates even if they fail to +# verify. +# NO_DEFAULT_CA +# Don't use the default CA list built in +# to OpenSSL. +# DONT_VERIFY_DOMAIN +# Don't verify the peer certificate +# matches the server name +# +# ssldomain= The peer name as advertised in it's certificate. +# Used for verifying the correctness of the received peer +# certificate. If not specified the peer hostname will be +# used. +# +# front-end-https +# Enable the "Front-End-Https: On" header needed when +# using Squid as a SSL frontend in front of Microsoft OWA. +# See MS KB document Q307347 for details on this header. +# If set to auto the header will only be added if the +# request is forwarded as a https:// URL. +# +# +# ==== GENERAL OPTIONS ==== +# +# connect-timeout=N +# A peer-specific connect timeout. +# Also see the peer_connect_timeout directive. +# +# connect-fail-limit=N +# How many times connecting to a peer must fail before +# it is marked as down. Default is 10. +# +# allow-miss Disable Squid's use of only-if-cached when forwarding +# requests to siblings. This is primarily useful when +# icp_hit_stale is used by the sibling. To extensive use +# of this option may result in forwarding loops, and you +# should avoid having two-way peerings with this option. +# For example to deny peer usage on requests from peer +# by denying cache_peer_access if the source is a peer. +# +# max-conn=N Limit the amount of connections Squid may open to this +# peer. see also +# +# name=xxx Unique name for the peer. +# Required if you have multiple peers on the same host +# but different ports. +# This name can be used in cache_peer_access and similar +# directives to dentify the peer. +# Can be used by outgoing access controls through the +# peername ACL type. +# +# no-tproxy Do not use the client-spoof TPROXY support when forwarding +# requests to this peer. Use normal address selection instead. +# +# proxy-only objects fetched from the peer will not be stored locally. +# #Default: # none @@ -255,7 +2315,7 @@ # has the effect such that UDP query packets are sent to # 'bigserver' only when the requested object exists on a # server in the .edu domain. Prefixing the domainname -# with '!' means that the cache will be queried for objects +# with '!' means the cache will be queried for objects # NOT in that domain. # # NOTE: * Any number of domains may be given for a cache-host, @@ -267,62 +2327,38 @@ # * There are no defaults. # * There is also a 'cache_peer_access' tag in the ACL # section. +#Default: +# none + +# TAG: cache_peer_access +# Similar to 'cache_peer_domain' but provides more flexibility by +# using ACL elements. +# +# cache_peer_access cache-host allow|deny [!]aclname ... # +# The syntax is identical to 'http_access' and the other lists of +# ACL elements. See the comments for 'http_access' below, or +# the Squid FAQ (http://wiki.squid-cache.org/SquidFaq/SquidAcl). #Default: # none # TAG: neighbor_type_domain -# usage: neighbor_type_domain parent|sibling domain domain ... +# usage: neighbor_type_domain neighbor parent|sibling domain domain ... # # Modifying the neighbor type for specific domains is now -# possible. You can treat some domains differently than the the +# possible. You can treat some domains differently than the # default neighbor type specified on the 'cache_peer' line. # Normally it should only be necessary to list domains which # should be treated differently because the default neighbor type # applies for hostnames which do not match domains listed here. # #EXAMPLE: -# cache_peer parent cache.foo.org 3128 3130 +# cache_peer cache.foo.org parent 3128 3130 # neighbor_type_domain cache.foo.org sibling .com .net # neighbor_type_domain cache.foo.org sibling .au .de -# #Default: # none -# TAG: icp_query_timeout (msec) -# Normally Squid will automatically determine an optimal ICP -# query timeout value based on the round-trip-time of recent ICP -# queries. If you want to override the value determined by -# Squid, set this 'icp_query_timeout' to a non-zero value. This -# value is specified in MILLISECONDS, so, to use a 2-second -# timeout (the old default), you would write: -# -# icp_query_timeout 2000 -# -#Default: -# icp_query_timeout 0 - -# TAG: maximum_icp_query_timeout (msec) -# Normally the ICP query timeout is determined dynamically. But -# sometimes it can lead to very large values (say 5 seconds). -# Use this option to put an upper limit on the dynamic timeout -# value. Do NOT use this option to always use a fixed (instead -# of a dynamic) timeout value. To set a fixed timeout see the -# 'icp_query_timeout' directive. -# -#Default: -# maximum_icp_query_timeout 2000 - -# TAG: mcast_icp_query_timeout (msec) -# For Multicast peers, Squid regularly sends out ICP "probes" to -# count how many other peers are listening on the given multicast -# address. This value specifies how long Squid should wait to -# count all the replies. The default is 2000 msec, or 2 -# seconds. -# -#Default: -# mcast_icp_query_timeout 2000 - # TAG: dead_peer_timeout (seconds) # This controls how long Squid waits to declare a peer cache # as "dead." If there are no ICP replies received in this @@ -338,41 +2374,39 @@ # your time between requests is greater than this timeout, you # will see a lot of requests sent DIRECT to origin servers # instead of to your parents. -# #Default: # dead_peer_timeout 10 seconds +# TAG: forward_max_tries +# Controls how many different forward paths Squid will try +# before giving up. See also forward_timeout. +# +# NOTE: connect_retries (default: none) can make each of these +# possible forwarding paths be tried multiple times. +#Default: +# forward_max_tries 10 + # TAG: hierarchy_stoplist # A list of words which, if found in a URL, cause the object to # be handled directly by this cache. In other words, use this # to not query neighbor caches for certain objects. You may # list this option multiple times. # -#We recommend you to use at least the following line. -hierarchy_stoplist cgi-bin ? - -# TAG: no_cache -# A list of ACL elements which, if matched, cause the reply to -# immediately removed from the cache. In other words, use this -# to force certain objects to never be cached. -# -# You must use the word 'DENY' to indicate the ACL names which should -# NOT be cached. +# Example: +# hierarchy_stoplist cgi-bin ? # -#We recommend you to use the following two lines. -acl QUERY urlpath_regex cgi-bin \? -no_cache deny QUERY - +# Note: never_direct overrides this option. +#Default: +# none -# OPTIONS WHICH AFFECT THE CACHE SIZE +# MEMORY CACHE OPTIONS # ----------------------------------------------------------------------------- # TAG: cache_mem (bytes) -# NOTE: THIS PARAMETER DOES NOT SPECIFY THE MAXIMUM PROCESS -# SIZE. IT PLACES A LIMIT ON ONE ASPECT OF SQUID'S MEMORY -# USAGE. SQUID USES MEMORY FOR OTHER THINGS AS WELL. -# YOUR PROCESS WILL PROBABLY BECOME TWICE OR THREE TIMES -# BIGGER THAN THE VALUE YOU PUT HERE +# NOTE: THIS PARAMETER DOES NOT SPECIFY THE MAXIMUM PROCESS SIZE. +# IT ONLY PLACES A LIMIT ON HOW MUCH ADDITIONAL MEMORY SQUID WILL +# USE AS A MEMORY CACHE OF OBJECTS. SQUID USES MEMORY FOR OTHER +# THINGS AS WELL. SEE THE SQUID FAQ SECTION 8 FOR DETAILS. # # 'cache_mem' specifies the ideal amount of memory to be used # for: @@ -399,74 +2433,67 @@ no_cache deny QUERY # reached. Thereafter, blocks will be used to store hot # objects. # +# If shared memory caching is enabled, Squid does not use the shared +# cache space for in-transit objects, but they still consume as much +# local memory as they need. For more details about the shared memory +# cache, see memory_cache_shared. #Default: -# cache_mem 8 MB +# cache_mem 256 MB -# TAG: cache_swap_low (percent, 0-100) -# TAG: cache_swap_high (percent, 0-100) -# -# The low- and high-water marks for cache object replacement. -# Replacement begins when the swap (disk) usage is above the -# low-water mark and attempts to maintain utilization near the -# low-water mark. As swap utilization gets close to high-water -# mark object eviction becomes more aggressive. If utilization is -# close to the low-water mark less replacement is done each time. -# -# Defaults are 90% and 95%. If you have a large cache, 5% could be -# hundreds of MB. If this is the case you may wish to set these -# numbers closer together. -# +# TAG: maximum_object_size_in_memory (bytes) +# Objects greater than this size will not be attempted to kept in +# the memory cache. This should be set high enough to keep objects +# accessed frequently in memory to improve performance whilst low +# enough to keep larger objects from hoarding cache_mem. #Default: -# cache_swap_low 90 -# cache_swap_high 95 +# maximum_object_size_in_memory 512 KB -# TAG: maximum_object_size (bytes) -# Objects larger than this size will NOT be saved on disk. The -# value is specified in kilobytes, and the default is 4MB. If -# you wish to get a high BYTES hit ratio, you should probably -# increase this (one 32 MB object hit counts for 3200 10KB -# hits). If you wish to increase speed more than your want to -# save bandwidth you should leave this low. +# TAG: memory_cache_shared on|off +# Controls whether the memory cache is shared among SMP workers. # -# NOTE: if using the LFUDA replacement policy you should increase -# this value to maximize the byte hit rate improvement of LFUDA! -# See replacement_policy below for a discussion of this policy. +# The shared memory cache is meant to occupy cache_mem bytes and replace +# the non-shared memory cache, although some entities may still be +# cached locally by workers for now (e.g., internal and in-transit +# objects may be served from a local memory cache even if shared memory +# caching is enabled). # -#Default: -# maximum_object_size 4096 KB - -# TAG: minimum_object_size (bytes) -# Objects smaller than this size will NOT be saved on disk. The -# value is specified in kilobytes, and the default is 0 KB, which -# means there is no minimum. +# By default, the memory cache is shared if and only if all of the +# following conditions are satisfied: Squid runs in SMP mode with +# multiple workers, cache_mem is positive, and Squid environment +# supports required IPC primitives (e.g., POSIX shared memory segments +# and GCC-style atomic operations). # -#Default: -# minimum_object_size 0 KB - -# TAG: maximum_object_size_in_memory (bytes) -# Objects greater than this size will not be attempted to kept in -# the memory cache. This should be set high enough to keep objects -# accessed frequently in memory to improve performance whilst low -# enough to keep larger objects from hoarding cache_mem . +# To avoid blocking locks, shared memory uses opportunistic algorithms +# that do not guarantee that every cachable entity that could have been +# shared among SMP workers will actually be shared. # +# Currently, entities exceeding 32KB in size cannot be shared. #Default: -# maximum_object_size_in_memory 8 KB +# "on" where supported if doing memory caching with multiple SMP workers. -# TAG: ipcache_size (number of entries) -# TAG: ipcache_low (percent) -# TAG: ipcache_high (percent) -# The size, low-, and high-water marks for the IP cache. +# TAG: memory_cache_mode +# Controls which objects to keep in the memory cache (cache_mem) +# +# always Keep most recently fetched objects in memory (default) # +# disk Only disk cache hits are kept in memory, which means +# an object must first be cached on disk and then hit +# a second time before cached in memory. +# +# network Only objects fetched from network is kept in memory #Default: -# ipcache_size 1024 -# ipcache_low 90 -# ipcache_high 95 +# memory_cache_mode always -# TAG: fqdncache_size (number of entries) -# Maximum number of FQDN cache entries. +# TAG: memory_replacement_policy +# The memory replacement policy parameter determines which +# objects are purged from memory when memory space is needed. # +# See cache_replacement_policy for details. #Default: -# fqdncache_size 1024 +# memory_replacement_policy lru + +# DISK CACHE OPTIONS +# ----------------------------------------------------------------------------- # TAG: cache_replacement_policy # The cache replacement policy parameter determines which @@ -496,49 +2523,37 @@ no_cache deny QUERY # replacement policies. # # NOTE: if using the LFUDA replacement policy you should increase -# the value of maximum_object_size above its default of 4096 KB to -# to maximize the potential byte hit rate improvement of LFUDA. +# the value of maximum_object_size above its default of 4 MB to +# to maximize the potential byte hit rate improvement of LFUDA. # # For more information about the GDSF and LFUDA cache replacement # policies see http://www.hpl.hp.com/techreports/1999/HPL-1999-69.html # and http://fog.hpl.external.hp.com/techreports/98/HPL-98-173.html. -# #Default: # cache_replacement_policy lru -# TAG: memory_replacement_policy -# The memory replacement policy parameter determines which -# objects are purged from memory when memory space is needed. -# -# See cache_replacement_policy for details. -# -#Default: -# memory_replacement_policy lru - - -# LOGFILE PATHNAMES AND CACHE DIRECTORIES -# ----------------------------------------------------------------------------- - # TAG: cache_dir # Usage: -# +# # cache_dir Type Directory-Name Fs-specific-data [options] # # You can specify multiple cache_dir lines to spread the # cache among different disk partitions. # -# Type specifies the kind of storage system to use. Most -# everyone will want to use "ufs" as the type. If you are using -# Async I/O (--enable async-io) on Linux or Solaris, then you may -# want to try "aufs" as the type. Async IO support may be -# buggy, however, so beware. +# Type specifies the kind of storage system to use. Only "ufs" +# is built by default. To enable any of the other storage systems +# see the --enable-storeio configure option. # # 'Directory' is a top-level directory where cache swap # files will be stored. If you want to use an entire disk -# for caching, then this can be the mount-point directory. +# for caching, this can be the mount-point directory. # The directory must exist and be writable by the Squid # process. Squid will NOT create this directory for you. # +# In SMP configurations, cache_dir must not precede the workers option +# and should use configuration macros or conditionals to give each +# worker interested in disk caching a dedicated cache directory. +# # The ufs store type: # # "ufs" is the old well-known Squid storage format that has always @@ -548,12 +2563,14 @@ no_cache deny QUERY # # 'Mbytes' is the amount of disk space (MB) to use under this # directory. The default is 100 MB. Change this to suit your -# configuration. +# configuration. Do NOT put the size of your disk drive here. +# Instead, if you want Squid to use the entire disk drive, +# subtract 20% and use that value. # -# 'Level-1' is the number of first-level subdirectories which +# 'L1' is the number of first-level subdirectories which # will be created under the 'Directory'. The default is 16. # -# 'Level-2' is the number of second-level subdirectories which +# 'L2' is the number of second-level subdirectories which # will be created under each first-level directory. The default # is 256. # @@ -583,62 +2600,539 @@ no_cache deny QUERY # # Q2 specifies the number of unacknowledged messages when Squid # starts blocking. If this many messages are in the queues, -# Squid blocks until it recevies some replies. Default is 72 +# Squid blocks until it receives some replies. Default is 72 +# +# When Q1 < Q2 (the default), the cache directory is optimized +# for lower response time at the expense of a decrease in hit +# ratio. If Q1 > Q2, the cache directory is optimized for +# higher hit ratio at the expense of an increase in response +# time. +# +# The rock store type: +# +# cache_dir rock Directory-Name Mbytes <max-size=bytes> [options] +# +# The Rock Store type is a database-style storage. All cached +# entries are stored in a "database" file, using fixed-size slots, +# one entry per slot. The database size is specified in MB. The +# slot size is specified in bytes using the max-size option. See +# below for more info on the max-size option. +# +# If possible, Squid using Rock Store creates a dedicated kid +# process called "disker" to avoid blocking Squid worker(s) on disk +# I/O. One disker kid is created for each rock cache_dir. Diskers +# are created only when Squid, running in daemon mode, has support +# for the IpcIo disk I/O module. +# +# swap-timeout=msec: Squid will not start writing a miss to or +# reading a hit from disk if it estimates that the swap operation +# will take more than the specified number of milliseconds. By +# default and when set to zero, disables the disk I/O time limit +# enforcement. Ignored when using blocking I/O module because +# blocking synchronous I/O does not allow Squid to estimate the +# expected swap wait time. +# +# max-swap-rate=swaps/sec: Artificially limits disk access using +# the specified I/O rate limit. Swap out requests that +# would cause the average I/O rate to exceed the limit are +# delayed. Individual swap in requests (i.e., hits or reads) are +# not delayed, but they do contribute to measured swap rate and +# since they are placed in the same FIFO queue as swap out +# requests, they may wait longer if max-swap-rate is smaller. +# This is necessary on file systems that buffer "too +# many" writes and then start blocking Squid and other processes +# while committing those writes to disk. Usually used together +# with swap-timeout to avoid excessive delays and queue overflows +# when disk demand exceeds available disk "bandwidth". By default +# and when set to zero, disables the disk I/O rate limit +# enforcement. Currently supported by IpcIo module only. +# +# +# The coss store type: +# +# NP: COSS filesystem in Squid-3 has been deemed too unstable for +# production use and has thus been removed from this release. +# We hope that it can be made usable again soon. +# +# block-size=n defines the "block size" for COSS cache_dir's. +# Squid uses file numbers as block numbers. Since file numbers +# are limited to 24 bits, the block size determines the maximum +# size of the COSS partition. The default is 512 bytes, which +# leads to a maximum cache_dir size of 512<<24, or 8 GB. Note +# you should not change the coss block size after Squid +# has written some objects to the cache_dir. +# +# The coss file store has changed from 2.5. Now it uses a file +# called 'stripe' in the directory names in the config - and +# this will be created by squid -z. # # Common options: # -# read-only, this cache_dir is read only. +# no-store, no new objects should be stored to this cache_dir +# +# min-size=n, refers to the min object size in bytes this cache_dir +# will accept. It's used to restrict a cache_dir to only store +# large objects (e.g. aufs) while other storedirs are optimized +# for smaller objects (e.g. COSS). Defaults to 0. # -# max-size=n, refers to the max object size this storedir supports. -# It is used to initially choose the storedir to dump the object. +# max-size=n, refers to the max object size in bytes this cache_dir +# supports. It is used to select the cache_dir to store the object. # Note: To make optimal use of the max-size limits you should order # the cache_dir lines with the smallest max-size value first and the # ones with no max-size specification last. # +# Note for coss, max-size must be less than COSS_MEMBUF_SZ, +# which can be changed with the --with-coss-membuf-size=N configure +# option. +# + +# Uncomment and adjust the following to add a disk cache directory. +#cache_dir ufs /var/spool/squid 100 16 256 + +# TAG: store_dir_select_algorithm +# Set this to 'round-robin' as an alternative. +#Default: +# store_dir_select_algorithm least-load + +# TAG: max_open_disk_fds +# To avoid having disk as the I/O bottleneck Squid can optionally +# bypass the on-disk cache if more than this amount of disk file +# descriptors are open. +# +# A value of 0 indicates no limit. #Default: -# cache_dir ufs /var/spool/squid 100 16 256 +# max_open_disk_fds 0 -# TAG: cache_access_log -# Logs the client request activity. Contains an entry for -# every HTTP and ICP queries received. +# TAG: minimum_object_size (bytes) +# Objects smaller than this size will NOT be saved on disk. The +# value is specified in kilobytes, and the default is 0 KB, which +# means there is no minimum. +#Default: +# minimum_object_size 0 KB + +# TAG: maximum_object_size (bytes) +# The default limit on size of objects stored to disk. +# This size is used for cache_dir where max-size is not set. +# The value is specified in bytes, and the default is 4 MB. +# +# If you wish to get a high BYTES hit ratio, you should probably +# increase this (one 32 MB object hit counts for 3200 10KB +# hits). +# +# If you wish to increase hit ratio more than you want to +# save bandwidth you should leave this low. # +# NOTE: if using the LFUDA replacement policy you should increase +# this value to maximize the byte hit rate improvement of LFUDA! +# See replacement_policy below for a discussion of this policy. #Default: -# cache_access_log /var/log/squid/access.log +# maximum_object_size 4 MB -# TAG: cache_log -# Cache logging file. This is where general information about -# your cache's behavior goes. You can increase the amount of data -# logged to this file with the "debug_options" tag below. +# TAG: cache_swap_low (percent, 0-100) +#Default: +# cache_swap_low 90 + +# TAG: cache_swap_high (percent, 0-100) # +# The low- and high-water marks for cache object replacement. +# Replacement begins when the swap (disk) usage is above the +# low-water mark and attempts to maintain utilization near the +# low-water mark. As swap utilization gets close to high-water +# mark object eviction becomes more aggressive. If utilization is +# close to the low-water mark less replacement is done each time. +# +# Defaults are 90% and 95%. If you have a large cache, 5% could be +# hundreds of MB. If this is the case you may wish to set these +# numbers closer together. #Default: -# cache_log /var/log/squid/cache.log +# cache_swap_high 95 + +# LOGFILE OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: logformat +# Usage: +# +# logformat <name> <format specification> +# +# Defines an access log format. +# +# The <format specification> is a string with embedded % format codes +# +# % format codes all follow the same basic structure where all but +# the formatcode is optional. Output strings are automatically escaped +# as required according to their context and the output format +# modifiers are usually not needed, but can be specified if an explicit +# output format is desired. +# +# % ["|[|'|#] [-] [[0]width] [{argument}] formatcode +# +# " output in quoted string format +# [ output in squid text log format as used by log_mime_hdrs +# # output in URL quoted format +# ' output as-is +# +# - left aligned +# +# width minimum and/or maximum field width: +# [width_min][.width_max] +# When minimum starts with 0, the field is zero-padded. +# String values exceeding maximum width are truncated. +# +# {arg} argument such as header name etc +# +# Format codes: +# +# % a literal % character +# sn Unique sequence number per log line entry +# err_code The ID of an error response served by Squid or +# a similar internal error identifier. +# err_detail Additional err_code-dependent error information. +# +# Connection related format codes: +# +# >a Client source IP address +# >A Client FQDN +# >p Client source port +# >eui Client source EUI (MAC address, EUI-48 or EUI-64 identifier) +# >la Local IP address the client connected to +# >lp Local port number the client connected to +# +# la Local listening IP address the client connection was connected to. +# lp Local listening port number the client connection was connected to. +# +# <a Server IP address of the last server or peer connection +# <A Server FQDN or peer name +# <p Server port number of the last server or peer connection +# <la Local IP address of the last server or peer connection +# <lp Local port number of the last server or peer connection +# +# Time related format codes: +# +# ts Seconds since epoch +# tu subsecond time (milliseconds) +# tl Local time. Optional strftime format argument +# default %d/%b/%Y:%H:%M:%S %z +# tg GMT time. Optional strftime format argument +# default %d/%b/%Y:%H:%M:%S %z +# tr Response time (milliseconds) +# dt Total time spent making DNS lookups (milliseconds) +# +# Access Control related format codes: +# +# et Tag returned by external acl +# ea Log string returned by external acl +# un User name (any available) +# ul User name from authentication +# ue User name from external acl helper +# ui User name from ident +# us User name from SSL +# +# HTTP related format codes: +# +# [http::]>h Original request header. Optional header name argument +# on the format header[:[separator]element] +# [http::]>ha The HTTP request headers after adaptation and redirection. +# Optional header name argument as for >h +# [http::]<h Reply header. Optional header name argument +# as for >h +# [http::]>Hs HTTP status code sent to the client +# [http::]<Hs HTTP status code received from the next hop +# [http::]<bs Number of HTTP-equivalent message body bytes +# received from the next hop, excluding chunked +# transfer encoding and control messages. +# Generated FTP/Gopher listings are treated as +# received bodies. +# [http::]mt MIME content type +# [http::]rm Request method (GET/POST etc) +# [http::]>rm Request method from client +# [http::]<rm Request method sent to server or peer +# [http::]ru Request URL from client (historic, filtered for logging) +# [http::]>ru Request URL from client +# [http::]<ru Request URL sent to server or peer +# [http::]rp Request URL-Path excluding hostname +# [http::]>rp Request URL-Path excluding hostname from client +# [http::]<rp Request URL-Path excluding hostname sento to server or peer +# [http::]rv Request protocol version +# [http::]>rv Request protocol version from client +# [http::]<rv Request protocol version sent to server or peer +# [http::]<st Sent reply size including HTTP headers +# [http::]>st Received request size including HTTP headers. In the +# case of chunked requests the chunked encoding metadata +# are not included +# [http::]>sh Received HTTP request headers size +# [http::]<sh Sent HTTP reply headers size +# [http::]st Request+Reply size including HTTP headers +# [http::]<sH Reply high offset sent +# [http::]<sS Upstream object size +# [http::]<pt Peer response time in milliseconds. The timer starts +# when the last request byte is sent to the next hop +# and stops when the last response byte is received. +# [http::]<tt Total server-side time in milliseconds. The timer +# starts with the first connect request (or write I/O) +# sent to the first selected peer. The timer stops +# with the last I/O with the last peer. +# +# Squid handling related format codes: +# +# Ss Squid request status (TCP_MISS etc) +# Sh Squid hierarchy status (DEFAULT_PARENT etc) +# +# If ICAP is enabled, the following code becomes available (as +# well as ICAP log codes documented with the icap_log option): +# +# icap::tt Total ICAP processing time for the HTTP +# transaction. The timer ticks when ICAP +# ACLs are checked and when ICAP +# transaction is in progress. +# +# If adaptation is enabled the following three codes become available: +# +# adapt::<last_h The header of the last ICAP response or +# meta-information from the last eCAP +# transaction related to the HTTP transaction. +# Like <h, accepts an optional header name +# argument. +# +# adapt::sum_trs Summed adaptation transaction response +# times recorded as a comma-separated list in +# the order of transaction start time. Each time +# value is recorded as an integer number, +# representing response time of one or more +# adaptation (ICAP or eCAP) transaction in +# milliseconds. When a failed transaction is +# being retried or repeated, its time is not +# logged individually but added to the +# replacement (next) transaction. See also: +# adapt::all_trs. +# +# adapt::all_trs All adaptation transaction response times. +# Same as adaptation_strs but response times of +# individual transactions are never added +# together. Instead, all transaction response +# times are recorded individually. +# +# You can prefix adapt::*_trs format codes with adaptation +# service name in curly braces to record response time(s) specific +# to that service. For example: %{my_service}adapt::sum_trs +# +# The default formats available (which do not need re-defining) are: +# +#logformat squid %ts.%03tu %6tr %>a %Ss/%03>Hs %<st %rm %ru %[un %Sh/%<a %mt +#logformat common %>a %[ui %[un [%tl] "%rm %ru HTTP/%rv" %>Hs %<st %Ss:%Sh +#logformat combined %>a %[ui %[un [%tl] "%rm %ru HTTP/%rv" %>Hs %<st "%{Referer}>h" "%{User-Agent}>h" %Ss:%Sh +#logformat referrer %ts.%03tu %>a %{Referer}>h %ru +#logformat useragent %>a [%tl] "%{User-Agent}>h" +# +# NOTE: When the log_mime_hdrs directive is set to ON. +# The squid, common and combined formats have a safely encoded copy +# of the mime headers appended to each line within a pair of brackets. +# +# NOTE: The common and combined formats are not quite true to the Apache definition. +# The logs from Squid contain an extra status and hierarchy code appended. +# +#Default: +# none + +# TAG: access_log +# These files log client request activities. Has a line every HTTP or +# ICP request. The format is: +# access_log <module>:<place> [<logformat name> [acl acl ...]] +# access_log none [acl acl ...]] +# +# Will log to the specified module:place using the specified format (which +# must be defined in a logformat directive) those entries which match +# ALL the acl's specified (which must be defined in acl clauses). +# If no acl is specified, all requests will be logged to this destination. +# +# ===== Modules Currently available ===== +# +# none Do not log any requests matching these ACL. +# Do not specify Place or logformat name. +# +# stdio Write each log line to disk immediately at the completion of +# each request. +# Place: the filename and path to be written. +# +# daemon Very similar to stdio. But instead of writing to disk the log +# line is passed to a daemon helper for asychronous handling instead. +# Place: varies depending on the daemon. +# +# log_file_daemon Place: the file name and path to be written. +# +# syslog To log each request via syslog facility. +# Place: The syslog facility and priority level for these entries. +# Place Format: facility.priority +# +# where facility could be any of: +# authpriv, daemon, local0 ... local7 or user. +# +# And priority could be any of: +# err, warning, notice, info, debug. +# +# udp To send each log line as text data to a UDP receiver. +# Place: The destination host name or IP and port. +# Place Format: //host:port +# +# tcp To send each log line as text data to a TCP receiver. +# Place: The destination host name or IP and port. +# Place Format: //host:port +# +# Default: +# access_log daemon:/var/log/squid/access.log squid +#Default: +# access_log daemon:/var/log/squid/access.log squid + +# TAG: icap_log +# ICAP log files record ICAP transaction summaries, one line per +# transaction. +# +# The icap_log option format is: +# icap_log <filepath> [<logformat name> [acl acl ...]] +# icap_log none [acl acl ...]] +# +# Please see access_log option documentation for details. The two +# kinds of logs share the overall configuration approach and many +# features. +# +# ICAP processing of a single HTTP message or transaction may +# require multiple ICAP transactions. In such cases, multiple +# ICAP transaction log lines will correspond to a single access +# log line. +# +# ICAP log uses logformat codes that make sense for an ICAP +# transaction. Header-related codes are applied to the HTTP header +# embedded in an ICAP server response, with the following caveats: +# For REQMOD, there is no HTTP response header unless the ICAP +# server performed request satisfaction. For RESPMOD, the HTTP +# request header is the header sent to the ICAP server. For +# OPTIONS, there are no HTTP headers. +# +# The following format codes are also available for ICAP logs: +# +# icap::<A ICAP server IP address. Similar to <A. +# +# icap::<service_name ICAP service name from the icap_service +# option in Squid configuration file. +# +# icap::ru ICAP Request-URI. Similar to ru. +# +# icap::rm ICAP request method (REQMOD, RESPMOD, or +# OPTIONS). Similar to existing rm. +# +# icap::>st Bytes sent to the ICAP server (TCP payload +# only; i.e., what Squid writes to the socket). +# +# icap::<st Bytes received from the ICAP server (TCP +# payload only; i.e., what Squid reads from +# the socket). +# +# icap::<bs Number of message body bytes received from the +# ICAP server. ICAP message body, if any, usually +# includes encapsulated HTTP message headers and +# possibly encapsulated HTTP message body. The +# HTTP body part is dechunked before its size is +# computed. +# +# icap::tr Transaction response time (in +# milliseconds). The timer starts when +# the ICAP transaction is created and +# stops when the transaction is completed. +# Similar to tr. +# +# icap::tio Transaction I/O time (in milliseconds). The +# timer starts when the first ICAP request +# byte is scheduled for sending. The timers +# stops when the last byte of the ICAP response +# is received. +# +# icap::to Transaction outcome: ICAP_ERR* for all +# transaction errors, ICAP_OPT for OPTION +# transactions, ICAP_ECHO for 204 +# responses, ICAP_MOD for message +# modification, and ICAP_SAT for request +# satisfaction. Similar to Ss. +# +# icap::Hs ICAP response status code. Similar to Hs. +# +# icap::>h ICAP request header(s). Similar to >h. +# +# icap::<h ICAP response header(s). Similar to <h. +# +# The default ICAP log format, which can be used without an explicit +# definition, is called icap_squid: +# +#logformat icap_squid %ts.%03tu %6icap::tr %>a %icap::to/%03icap::Hs %icap::<size %icap::rm %icap::ru% %un -/%icap::<A - +# +# See also: logformat, log_icap, and %adapt::<last_h +#Default: +# none + +# TAG: logfile_daemon +# Specify the path to the logfile-writing daemon. This daemon is +# used to write the access and store logs, if configured. +# +# Squid sends a number of commands to the log daemon: +# L<data>\n - logfile data +# R\n - rotate file +# T\n - truncate file +# O\n - reopen file +# F\n - flush file +# r<n>\n - set rotate count to <n> +# b<n>\n - 1 = buffer output, 0 = don't buffer output +# +# No responses is expected. +#Default: +# logfile_daemon /usr/lib64/squid/log_file_daemon + +# TAG: log_access allow|deny acl acl... +# This options allows you to control which requests gets logged +# to access.log (see access_log directive). Requests denied for +# logging will also not be accounted for in performance counters. +# +# This clause only supports fast acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. +#Default: +# none + +# TAG: log_icap +# This options allows you to control which requests get logged +# to icap.log. See the icap_log directive for ICAP log details. +#Default: +# none # TAG: cache_store_log # Logs the activities of the storage manager. Shows which # objects are ejected from the cache, and which objects are -# saved and for how long. To disable, enter "none". There are -# not really utilities to analyze this data, so you can safely -# disable it. -# +# saved and for how long. +# There are not really utilities to analyze this data, so you can safely +# disable it (the default). +# +# Store log uses modular logging outputs. See access_log for the list +# of modules supported. +# +# Example: +# cache_store_log stdio:/var/log/squid/store.log +# cache_store_log daemon:/var/log/squid/store.log #Default: -# cache_store_log /var/log/squid/store.log +# none -# TAG: cache_swap_log -# Location for the cache "swap.log." This log file holds the -# metadata of objects saved on disk. It is used to rebuild the -# cache during startup. Normally this file resides in each +# TAG: cache_swap_state +# Location for the cache "swap.state" file. This index file holds +# the metadata of objects saved on disk. It is used to rebuild +# the cache during startup. Normally this file resides in each # 'cache_dir' directory, but you may specify an alternate # pathname here. Note you must give a full filename, not just # a directory. Since this is the index for the whole object # list you CANNOT periodically rotate it! # -# If %s can be used in the file name then it will be replaced with a +# If %s can be used in the file name it will be replaced with a # a representation of the cache_dir name where each / is replaced # with '.'. This is needed to allow adding/removing cache_dir # lines when cache_swap_log is being used. -# +# # If have more than one 'cache_dir', and %s is not used in the name -# then these swap logs will have names such as: +# these swap logs will have names such as: # # cache_swap_log.00 # cache_swap_log.01 @@ -647,37 +3141,47 @@ no_cache deny QUERY # The numbered extension (which is added automatically) # corresponds to the order of the 'cache_dir' lines in this # configuration file. If you change the order of the 'cache_dir' -# lines in this file, then these log files will NOT correspond to +# lines in this file, these index files will NOT correspond to # the correct 'cache_dir' entry (unless you manually rename -# them). We recommend that you do NOT use this option. It is -# better to keep these log files in each 'cache_dir' directory. -# +# them). We recommend you do NOT use this option. It is +# better to keep these index files in each 'cache_dir' directory. #Default: # none -# TAG: emulate_httpd_log on|off -# The Cache can emulate the log file format which many 'httpd' -# programs use. To disable/enable this emulation, set -# emulate_httpd_log to 'off' or 'on'. The default -# is to use the native log format since it includes useful -# information that Squid-specific log analyzers use. +# TAG: logfile_rotate +# Specifies the number of logfile rotations to make when you +# type 'squid -k rotate'. The default is 10, which will rotate +# with extensions 0 through 9. Setting logfile_rotate to 0 will +# disable the file name rotation, but the logfiles are still closed +# and re-opened. This will enable you to rename the logfiles +# yourself just before sending the rotate signal. # +# Note, the 'squid -k rotate' command normally sends a USR1 +# signal to the running squid process. In certain situations +# (e.g. on Linux with Async I/O), USR1 is used for other +# purposes, so -k rotate uses another signal. It is best to get +# in the habit of using 'squid -k rotate' instead of 'kill -USR1 +# <pid>'. +# +# Note, from Squid-3.1 this option has no effect on the cache.log, +# that log can be rotated separately by using debug_options #Default: -# emulate_httpd_log off +# logfile_rotate 0 -# TAG: log_ip_on_direct on|off -# Log the destination IP address in the hierarchy log tag when going -# direct. Earlier Squid versions logged the hostname here. If you -# prefer the old way set this to off. -# +# TAG: emulate_httpd_log +# Replace this with an access_log directive using the format 'common' or 'combined'. +#Default: +# none + +# TAG: log_ip_on_direct +# Remove this option from your config. To log server or peer names use %<A in the log format. #Default: -# log_ip_on_direct on +# none # TAG: mime_table # Pathname to Squid's MIME table. You shouldn't need to change # this, but the default file contains examples and formatting # information if you do. -# #Default: # mime_table /etc/squid/mime.conf @@ -687,66 +3191,103 @@ no_cache deny QUERY # safely and will appear as two bracketed fields at the end of # the access log (for either the native or httpd-emulated log # formats). To enable this logging set log_mime_hdrs to 'on'. -# #Default: # log_mime_hdrs off # TAG: useragent_log -# Squid will write the User-Agent field from HTTP requests -# to the filename specified here. By default useragent_log -# is disabled. -# +# Replace this with an access_log directive using the format 'useragent'. #Default: # none # TAG: referer_log -# Note: This option is only available if Squid is rebuilt with the -# --enable-referer-log option -# -# Squid will write the Referer field from HTTP requests to the -# filename specified here. By default referer_log is disabled. -# +# Replace this with an access_log directive using the format 'referrer'. #Default: # none # TAG: pid_filename # A filename to write the process-id to. To disable, enter "none". -# #Default: # pid_filename /var/run/squid.pid +# TAG: log_fqdn +# Remove this option from your config. To log FQDN use %>A in the log format. +#Default: +# none + +# TAG: client_netmask +# A netmask for client addresses in logfiles and cachemgr output. +# Change this to protect the privacy of your cache clients. +# A netmask of 255.255.255.0 will log all IP's in that range with +# the last digit set to '0'. +#Default: +# client_netmask no_addr + +# TAG: forward_log +# Use a regular access.log with ACL limiting it to MISS events. +#Default: +# none + +# TAG: strip_query_terms +# By default, Squid strips query terms from requested URLs before +# logging. This protects your user's privacy. +#Default: +# strip_query_terms on + +# TAG: buffered_logs on|off +# cache.log log file is written with stdio functions, and as such +# it can be buffered or unbuffered. By default it will be unbuffered. +# Buffering it can speed up the writing slightly (though you are +# unlikely to need to worry unless you run with tons of debugging +# enabled in which case performance will suffer badly anyway..). +#Default: +# buffered_logs off + +# TAG: netdb_filename +# A filename where Squid stores it's netdb state between restarts. +# To disable, enter "none". +#Default: +# netdb_filename stdio:/var/log/squid/netdb.state + +# OPTIONS FOR TROUBLESHOOTING +# ----------------------------------------------------------------------------- + +# TAG: cache_log +# Cache logging file. This is where general information about +# your cache's behavior goes. You can increase the amount of data +# logged to this file and how often its rotated with "debug_options" +#Default: +# cache_log /var/log/squid/cache.log + # TAG: debug_options # Logging options are set as section,level where each source file # is assigned a unique section. Lower levels result in less # output, Full debugging (level 9) can result in a very large -# log file, so be careful. The magic word "ALL" sets debugging -# levels for all sections. We recommend normally running with -# "ALL,1". +# log file, so be careful. # +# The magic word "ALL" sets debugging levels for all sections. +# We recommend normally running with "ALL,1". +# +# The rotate=N option can be used to keep more or less of these logs +# than would otherwise be kept by logfile_rotate. +# For most uses a single log should be enough to monitor current +# events affecting Squid. #Default: # debug_options ALL,1 -# TAG: log_fqdn on|off -# Turn this on if you wish to log fully qualified domain names -# in the access.log. To do this Squid does a DNS lookup of all -# IP's connecting to it. This can (in some situations) increase -# latency, which makes your cache seem slower for interactive -# browsing. +# TAG: coredump_dir +# By default Squid leaves core files in the directory from where +# it was started. If you set 'coredump_dir' to a directory +# that exists, Squid will chdir() to that directory at startup +# and coredump files will be left there. # #Default: -# log_fqdn off - -# TAG: client_netmask -# A netmask for client addresses in logfiles and cachemgr output. -# Change this to protect the privacy of your cache clients. -# A netmask of 255.255.255.0 will log all IP's in that range with -# the last digit set to '0'. +# coredump_dir none # -#Default: -# client_netmask 255.255.255.255 +# Leave coredumps in the first cache dir +coredump_dir /var/spool/squid -# OPTIONS FOR EXTERNAL SUPPORT PROGRAMS +# OPTIONS FOR FTP GATEWAYING # ----------------------------------------------------------------------------- # TAG: ftp_user @@ -754,272 +3295,258 @@ no_cache deny QUERY # (and enable the use of picky ftp servers), set this to something # reasonable for your domain, like wwwuser@somewhere.net # -# The reason why this is domainless by default is that the +# The reason why this is domainless by default is the # request can be made on the behalf of a user in any domain, # depending on how the cache is used. -# Some ftp server also validate that the email address is valid +# Some ftp server also validate the email address is valid # (for example perl.com). -# #Default: # ftp_user Squid@ -# TAG: ftp_list_width -# Sets the width of ftp listings. This should be set to fit in -# the width of a standard browser. Setting this too small -# can cut off long filenames when browsing ftp sites. -# -#Default: -# ftp_list_width 32 - # TAG: ftp_passive # If your firewall does not allow Squid to use passive -# connections, then turn off this option. +# connections, turn off this option. # +# Use of ftp_epsv_all option requires this to be ON. #Default: # ftp_passive on -# TAG: cache_dns_program -# Note: This option is only available if Squid is rebuilt with the -# --disable-internal-dns option +# TAG: ftp_epsv_all +# FTP Protocol extensions permit the use of a special "EPSV ALL" command. # -# Specify the location of the executable for dnslookup process. +# NATs may be able to put the connection on a "fast path" through the +# translator, as the EPRT command will never be used and therefore, +# translation of the data portion of the segments will never be needed. +# +# When a client only expects to do two-way FTP transfers this may be +# useful. +# If squid finds that it must do a three-way FTP transfer after issuing +# an EPSV ALL command, the FTP session will fail. # +# If you have any doubts about this option do not use it. +# Squid will nicely attempt all other connection methods. +# +# Requires ftp_passive to be ON (default) for any effect. #Default: -# cache_dns_program /usr/lib/squid/ +# ftp_epsv_all off -# TAG: dns_children -# Note: This option is only available if Squid is rebuilt with the -# --disable-internal-dns option +# TAG: ftp_epsv +# FTP Protocol extensions permit the use of a special "EPSV" command. # -# The number of processes spawn to service DNS name lookups. -# For heavily loaded caches on large servers, you should -# probably increase this value to at least 10. The maximum -# is 32. The default is 5. +# NATs may be able to put the connection on a "fast path" through the +# translator using EPSV, as the EPRT command will never be used +# and therefore, translation of the data portion of the segments +# will never be needed. # -# You must have at least one dnsserver process. +# Turning this OFF will prevent EPSV being attempted. +# WARNING: Doing so will convert Squid back to the old behavior with all +# the related problems with external NAT devices/layers. # +# Requires ftp_passive to be ON (default) for any effect. #Default: -# dns_children 5 +# ftp_epsv on -# TAG: dns_retransmit_interval -# Initial retransmit interval for DNS queries. The interval is -# doubled each time all configured DNS servers have been tried. +# TAG: ftp_eprt +# FTP Protocol extensions permit the use of a special "EPRT" command. # +# This extension provides a protocol neutral alternative to the +# IPv4-only PORT command. When supported it enables active FTP data +# channels over IPv6 and efficient NAT handling. # -#Default: -# dns_retransmit_interval 5 seconds - -# TAG: dns_timeout -# DNS Query timeout. If no response is received to a DNS query -# within this time then all DNS servers for the queried domain -# is assumed to be unavailable. +# Turning this OFF will prevent EPRT being attempted and will skip +# straight to using PORT for IPv4 servers. # +# Some devices are known to not handle this extension correctly and +# may result in crashes. Devices which suport EPRT enough to fail +# cleanly will result in Squid attempting PORT anyway. This directive +# should only be disabled when EPRT results in device failures. +# +# WARNING: Doing so will convert Squid back to the old behavior with all +# the related problems with external NAT devices/layers and IPv4-only FTP. #Default: -# dns_timeout 5 minutes +# ftp_eprt on -# TAG: dns_defnames on|off -# Note: This option is only available if Squid is rebuilt with the -# --disable-internal-dns option -# -# Normally the 'dnsserver' disables the RES_DEFNAMES resolver -# option (see res_init(3)). This prevents caches in a hierarchy -# from interpreting single-component hostnames locally. To allow -# dnsserver to handle single-component names, enable this -# option. -# +# TAG: ftp_sanitycheck +# For security and data integrity reasons Squid by default performs +# sanity checks of the addresses of FTP data connections ensure the +# data connection is to the requested server. If you need to allow +# FTP connections to servers using another IP address for the data +# connection turn this off. #Default: -# dns_defnames off +# ftp_sanitycheck on -# TAG: dns_nameservers -# Use this if you want to specify a list of DNS name servers -# (IP addresses) to use instead of those given in your -# /etc/resolv.conf file. -# -# Example: dns_nameservers 10.0.0.1 192.172.0.4 +# TAG: ftp_telnet_protocol +# The FTP protocol is officially defined to use the telnet protocol +# as transport channel for the control connection. However, many +# implementations are broken and does not respect this aspect of +# the FTP protocol. # +# If you have trouble accessing files with ASCII code 255 in the +# path or similar problems involving this ASCII code you can +# try setting this directive to off. If that helps, report to the +# operator of the FTP server in question that their FTP server +# is broken and does not follow the FTP standard. #Default: -# none +# ftp_telnet_protocol on + +# OPTIONS FOR EXTERNAL SUPPORT PROGRAMS +# ----------------------------------------------------------------------------- # TAG: diskd_program # Specify the location of the diskd executable. -# Note that this is only useful if you have compiled in +# Note this is only useful if you have compiled in # diskd as one of the store io modules. -# #Default: -# diskd_program /usr/lib/squid/diskd +# diskd_program /usr/lib64/squid/diskd # TAG: unlinkd_program # Specify the location of the executable for file deletion process. -# #Default: -# unlinkd_program /usr/lib/squid/unlinkd +# unlinkd_program /usr/lib64/squid/unlinkd # TAG: pinger_program -# Note: This option is only available if Squid is rebuilt with the -# --enable-icmp option -# # Specify the location of the executable for the pinger process. -# This is only useful if you configured Squid (during compilation) -# with the '--enable-icmp' option. -# #Default: -# pinger_program /usr/lib/squid/ +# pinger_program /usr/lib64/squid/pinger -# TAG: redirect_program -# Specify the location of the executable for the URL redirector. -# Since they can perform almost any function there isn't one included. -# See the Release-Notes for information on how to write one. -# By default, a redirector is not used. -# +# TAG: pinger_enable +# Control whether the pinger is active at run-time. +# Enables turning ICMP pinger on and off with a simple +# squid -k reconfigure. #Default: -# none +# pinger_enable on -# TAG: redirect_children -# The number of redirector processes to spawn. If you start -# too few Squid will have to wait for them to process a backlog of -# URLs, slowing it down. If you start too many they will use RAM -# and other system resources. -# -#Default: -# redirect_children 5 +# OPTIONS FOR URL REWRITING +# ----------------------------------------------------------------------------- -# TAG: redirect_rewrites_host_header -# By default Squid rewrites any Host: header in redirected -# requests. If you are running a accelerator then this may -# not be a wanted effect of a redirector. +# TAG: url_rewrite_program +# Specify the location of the executable URL rewriter to use. +# Since they can perform almost any function there isn't one included. # -#Default: -# redirect_rewrites_host_header on - -# TAG: redirector_access -# If defined, this access list specifies which requests are -# sent to the redirector processes. By default all requests -# are sent. +# For each requested URL, the rewriter will receive on line with the format # -#Default: -# none - -# TAG: authenticate_program -# Specify the command for the external authenticator. Such a -# program reads a line containing "username password" and replies -# "OK" or "ERR" in an endless loop. If you use an authenticator, -# make sure you have 1 acl of type proxy_auth. By default, the -# authenticator_program is not used. +# URL <SP> client_ip "/" fqdn <SP> user <SP> method [<SP> kvpairs]<NL> # -# If you want to use the traditional proxy authentication, -# jump over to the ../auth_modules/NCSA directory and -# type: -# % make -# % make install +# In the future, the rewriter interface will be extended with +# key=value pairs ("kvpairs" shown above). Rewriter programs +# should be prepared to receive and possibly ignore additional +# whitespace-separated tokens on each input line. # -# Then, set this line to something like +# And the rewriter may return a rewritten URL. The other components of +# the request line does not need to be returned (ignored if they are). # -# authenticate_program /usr/bin/ncsa_auth /usr/etc/passwd +# The rewriter can also indicate that a client-side redirect should +# be performed to the new URL. This is done by prefixing the returned +# URL with "301:" (moved permanently) or 302: (moved temporarily), etc. # +# By default, a URL rewriter is not used. #Default: # none -# TAG: authenticate_children -# The number of authenticator processes to spawn (default 5). If you -# start too few Squid will have to wait for them to process a backlog -# of usercode/password verifications, slowing it down. When password -# verifications are done via a (slow) network you are likely to need -# lots of authenticator processes. +# TAG: url_rewrite_children +# The maximum number of redirector processes to spawn. If you limit +# it too few Squid will have to wait for them to process a backlog of +# URLs, slowing it down. If you allow too many they will use RAM +# and other system resources noticably. +# +# The startup= and idle= options allow some measure of skew in your +# tuning. +# +# startup= +# +# Sets a minimum of how many processes are to be spawned when Squid +# starts or reconfigures. When set to zero the first request will +# cause spawning of the first child process to handle it. +# +# Starting too few will cause an initial slowdown in traffic as Squid +# attempts to simultaneously spawn enough processes to cope. +# +# idle= +# +# Sets a minimum of how many processes Squid is to try and keep available +# at all times. When traffic begins to rise above what the existing +# processes can handle this many more will be spawned up to the maximum +# configured. A minimum setting of 1 is required. # -#Default: -# authenticate_children 5 - -# TAG: authenticate_ttl -# The time a checked username/password combination remains cached. -# If a wrong password is given for a cached user, the user gets -# removed from the username/password cache forcing a revalidation. +# concurrency= # +# The number of requests each redirector helper can handle in +# parallel. Defaults to 0 which indicates the redirector +# is a old-style single threaded redirector. +# +# When this directive is set to a value >= 1 then the protocol +# used to communicate with the helper is modified to include +# a request ID in front of the request/response. The request +# ID from the request must be echoed back with the response +# to that request. #Default: -# authenticate_ttl 1 hour +# url_rewrite_children 20 startup=0 idle=1 concurrency=0 -# TAG: authenticate_ip_ttl -# With this option you control how long a proxy authentication -# will be bound to a specific IP address. If a request using -# the same user name is received during this time then access -# will be denied and both users are required to reauthenticate -# them selves. The idea behind this is to make it annoying -# for people to share their password to their friends, but -# yet allow a dialup user to reconnect on a different dialup -# port. -# -# The default is 0 to disable the check. Recommended value -# if you have dialup users are no more than 60 seconds to allow -# the user to redial without hassle. If all your users are -# stationary then higher values may be used. -# -# See also authenticate_ip_ttl_is_strict -# +# TAG: url_rewrite_host_header +# To preserve same-origin security policies in browsers and +# prevent Host: header forgery by redirectors Squid rewrites +# any Host: header in redirected requests. +# +# If you are running an accelerator this may not be a wanted +# effect of a redirector. This directive enables you disable +# Host: alteration in reverse-proxy traffic. +# +# WARNING: Entries are cached on the result of the URL rewriting +# process, so be careful if you have domain-virtual hosts. +# +# WARNING: Squid and other software verifies the URL and Host +# are matching, so be careful not to relay through other proxies +# or inspecting firewalls with this disabled. #Default: -# authenticate_ip_ttl 0 seconds +# url_rewrite_host_header on -# TAG: authenticate_ip_ttl_is_strict -# This option makes authenticate_ip_ttl a bit stricted. With this -# enabled authenticate_ip_ttl will deny all access from other IP -# addresses until the TTL has expired, and the IP address "owning" -# the userid will not be forced to reauthenticate. +# TAG: url_rewrite_access +# If defined, this access list specifies which requests are +# sent to the redirector processes. By default all requests +# are sent. # +# This clause supports both fast and slow acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. #Default: -# authenticate_ip_ttl_is_strict on +# none +# TAG: url_rewrite_bypass +# When this is 'on', a request will not go through the +# redirector if all redirectors are busy. If this is 'off' +# and the redirector queue grows too large, Squid will exit +# with a FATAL error and ask you to increase the number of +# redirectors. You should only enable this if the redirectors +# are not critical to your caching system. If you use +# redirectors for access control, and you enable this option, +# users may have access to pages they should not +# be allowed to request. +#Default: +# url_rewrite_bypass off # OPTIONS FOR TUNING THE CACHE # ----------------------------------------------------------------------------- -# TAG: wais_relay_host -# TAG: wais_relay_port -# Relay WAIS request to host (1st arg) at port (2 arg). +# TAG: cache +# A list of ACL elements which, if matched and denied, cause the request to +# not be satisfied from the cache and the reply to not be cached. +# In other words, use this to force certain objects to never be cached. # -#Default: -# wais_relay_port 0 - -# TAG: request_header_max_size (KB) -# This specifies the maximum size for HTTP headers in a request. -# Request headers are usually relatively small (about 512 bytes). -# Placing a limit on the request header size will catch certain -# bugs (for example with persistent connections) and possibly -# buffer-overflow or denial-of-service attacks. +# You must use the words 'allow' or 'deny' to indicate whether items +# matching the ACL should be allowed or denied into the cache. # -#Default: -# request_header_max_size 10 KB - -# TAG: request_body_max_size (KB) -# This specifies the maximum size for an HTTP request body. -# In other words, the maximum size of a PUT/POST request. -# A user who attempts to send a request with a body larger -# than this limit receives an "Invalid Request" error message. -# If you set this parameter to a zero, there will be no limit -# imposed. +# Default is to allow all to be cached. # +# This clause supports both fast and slow acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. #Default: -# request_body_max_size 1 MB +# none -# TAG: reply_body_max_size (KB) -# This option specifies the maximum size of a reply body. It -# can be used to prevent users from downloading very large files, -# such as MP3's and movies. The reply size is checked twice. -# First when we get the reply headers, we check the -# content-length value. If the content length value exists and -# is larger than this parameter, the request is denied and the -# user receives an error message that says "the request or reply -# is too large." If there is no content-length, and the reply -# size exceeds this limit, the client's connection is just closed -# and they will receive a partial reply. -# -# NOTE: downstream caches probably can not detect a partial reply -# if there is no content-length header, so they will cache -# partial responses and give them out as hits. You should NOT -# use this option if you have downstream caches. -# -# If you set this parameter to zero (the default), there will be -# no limit imposed. -# +# TAG: max_stale time-units +# This option puts an upper limit on how stale content Squid +# will serve from the cache if cache validation fails. +# Can be overriden by the refresh_pattern max-stale option. #Default: -# reply_body_max_size 0 +# max_stale 1 week # TAG: refresh_pattern # usage: refresh_pattern [-i] regex min percent max [options] @@ -1040,18 +3567,31 @@ no_cache deny QUERY # 'Max' is an upper limit on how long objects without an explicit # expiry time will be considered fresh. # -# options: overrsde-expire +# options: override-expire # override-lastmod # reload-into-ims # ignore-reload +# ignore-no-store +# ignore-must-revalidate +# ignore-private +# ignore-auth +# max-stale=NN +# refresh-ims +# store-stale # # override-expire enforces min age even if the server -# sent a Expires: header. Doing this VIOLATES the HTTP -# standard. Enabling this feature could make you liable -# for problems which it causes. +# sent an explicit expiry time (e.g., with the +# Expires: header or Cache-Control: max-age). Doing this +# VIOLATES the HTTP standard. Enabling this feature +# could make you liable for problems which it causes. +# +# Note: override-expire does not enforce staleness - it only extends +# freshness / min. If the server returns a Expires time which +# is longer than your max time, Squid will still consider +# the object fresh for that period of time. # # override-lastmod enforces min age even on objects -# that was modified recently. +# that were modified recently. # # reload-into-ims changes client no-cache or ``reload'' # to If-Modified-Since requests. Doing this VIOLATES the @@ -1062,10 +3602,44 @@ no_cache deny QUERY # header. Doing this VIOLATES the HTTP standard. Enabling # this feature could make you liable for problems which # it causes. -# -# Please see the file doc/Release-Notes-1.1.txt for a full -# description of Squid's refresh algorithm. Basically a -# cached object is: (the order is changed from 1.1.X) +# +# ignore-no-store ignores any ``Cache-control: no-store'' +# headers received from a server. Doing this VIOLATES +# the HTTP standard. Enabling this feature could make you +# liable for problems which it causes. +# +# ignore-must-revalidate ignores any ``Cache-Control: must-revalidate`` +# headers received from a server. Doing this VIOLATES +# the HTTP standard. Enabling this feature could make you +# liable for problems which it causes. +# +# ignore-private ignores any ``Cache-control: private'' +# headers received from a server. Doing this VIOLATES +# the HTTP standard. Enabling this feature could make you +# liable for problems which it causes. +# +# ignore-auth caches responses to requests with authorization, +# as if the originserver had sent ``Cache-control: public'' +# in the response header. Doing this VIOLATES the HTTP standard. +# Enabling this feature could make you liable for problems which +# it causes. +# +# refresh-ims causes squid to contact the origin server +# when a client issues an If-Modified-Since request. This +# ensures that the client will receive an updated version +# if one is available. +# +# store-stale stores responses even if they don't have explicit +# freshness or a validator (i.e., Last-Modified or an ETag) +# present, or if they're already stale. By default, Squid will +# not cache such responses because they usually can't be +# reused. Note that such responses will be stale by default. +# +# max-stale=NN provide a maximum staleness factor. Squid won't +# serve objects more stale than this even if it failed to +# validate the object. Default: use the max_stale global limit. +# +# Basically a cached object is: # # FRESH if expires < now, else STALE # STALE if age > max @@ -1075,57 +3649,42 @@ no_cache deny QUERY # # The refresh_pattern lines are checked in the order listed here. # The first entry which matches is used. If none of the entries -# match, then the default will be used. +# match the default will be used. # # Note, you must uncomment all the default lines if you want # to change one. The default setting is only active if none is # used. # -#Default: -# refresh_pattern ^ftp: 1440 20% 10080 -# refresh_pattern ^gopher: 1440 0% 1440 -# refresh_pattern . 0 20% 4320 - -# TAG: reference_age -# As a part of normal operation, Squid performs Least Recently -# Used removal of cached objects. The LRU age for removal is -# computed dynamically, based on the amount of disk space in -# use. The dynamic value can be seen in the Cache Manager 'info' -# output. # -# The 'reference_age' parameter defines the maximum LRU age. For -# example, setting reference_age to '1 week' will cause objects -# to be removed if they have not been accessed for a week or -# more. The default value is one year. -# -# Specify a number here, followed by units of time. For example: -# 1 week -# 3.5 days -# 4 months -# 2.2 hours -# -# NOTE: this parameter is not used when using the enhanced -# replacement policies, GDSH or LFUDA. -# -#Default: -# reference_age 1 year + +# Add any of your own refresh_pattern entries above these. +refresh_pattern ^ftp: 1440 20% 10080 +refresh_pattern ^gopher: 1440 0% 1440 +refresh_pattern -i (/cgi-bin/|\?) 0 0% 0 +refresh_pattern . 0 20% 4320 # TAG: quick_abort_min (KB) +#Default: +# quick_abort_min 16 KB + # TAG: quick_abort_max (KB) +#Default: +# quick_abort_max 16 KB + # TAG: quick_abort_pct (percent) -# The cache can be configured to continue downloading aborted -# requests. This may be undesirable on slow (e.g. SLIP) links -# and/or very busy caches. Impatient users may tie up file -# descriptors and bandwidth by repeatedly requesting and -# immediately aborting downloads. +# The cache by default continues downloading aborted requests +# which are almost completed (less than 16 KB remaining). This +# may be undesirable on slow (e.g. SLIP) links and/or very busy +# caches. Impatient users may tie up file descriptors and +# bandwidth by repeatedly requesting and immediately aborting +# downloads. # # When the user aborts a request, Squid will check the # quick_abort values to the amount of data transfered until # then. # # If the transfer has less than 'quick_abort_min' KB remaining, -# it will finish the retrieval. Setting 'quick_abort_min' to -1 -# will disable the quick_abort feature. +# it will finish the retrieval. # # If the transfer has more than 'quick_abort_max' KB remaining, # it will abort the retrieval. @@ -1133,103 +3692,503 @@ no_cache deny QUERY # If more than 'quick_abort_pct' of the transfer has completed, # it will finish the retrieval. # +# If you do not want any retrieval to continue after the client +# has aborted, set both 'quick_abort_min' and 'quick_abort_max' +# to '0 KB'. +# +# If you want retrievals to always continue if they are being +# cached set 'quick_abort_min' to '-1 KB'. #Default: -# quick_abort_min 16 KB -# quick_abort_max 16 KB # quick_abort_pct 95 +# TAG: read_ahead_gap buffer-size +# The amount of data the cache will buffer ahead of what has been +# sent to the client when retrieving an object from another server. +#Default: +# read_ahead_gap 16 KB + # TAG: negative_ttl time-units -# Time-to-Live (TTL) for failed requests. Certain types of -# failures (such as "connection refused" and "404 Not Found") are -# negatively-cached for a configurable amount of time. The -# default is 5 minutes. Note that this is different from -# negative caching of DNS lookups. +# Set the Default Time-to-Live (TTL) for failed requests. +# Certain types of failures (such as "connection refused" and +# "404 Not Found") are able to be negatively-cached for a short time. +# Modern web servers should provide Expires: header, however if they +# do not this can provide a minimum TTL. +# The default is not to cache errors with unknown expiry details. +# +# Note that this is different from negative caching of DNS lookups. # +# WARNING: Doing this VIOLATES the HTTP standard. Enabling +# this feature could make you liable for problems which it +# causes. #Default: -# negative_ttl 5 minutes +# negative_ttl 0 seconds # TAG: positive_dns_ttl time-units -# Time-to-Live (TTL) for positive caching of successful DNS lookups. -# Default is 6 hours (360 minutes). If you want to minimize the -# use of Squid's ipcache, set this to 1, not 0. -# +# Upper limit on how long Squid will cache positive DNS responses. +# Default is 6 hours (360 minutes). This directive must be set +# larger than negative_dns_ttl. #Default: # positive_dns_ttl 6 hours # TAG: negative_dns_ttl time-units # Time-to-Live (TTL) for negative caching of failed DNS lookups. -# +# This also sets the lower cache limit on positive lookups. +# Minimum value is 1 second, and it is not recommendable to go +# much below 10 seconds. #Default: -# negative_dns_ttl 5 minutes +# negative_dns_ttl 1 minutes -# TAG: range_offset_limit (bytes) -# Sets a upper limit on how far into the the file a Range request -# may be to cause Squid to prefetch the whole file. If beyond this -# limit then Squid forwards the Range request as it is and the result -# is NOT cached. -# +# TAG: range_offset_limit size [acl acl...] +# usage: (size) [units] [[!]aclname] +# +# Sets an upper limit on how far (number of bytes) into the file +# a Range request may be to cause Squid to prefetch the whole file. +# If beyond this limit, Squid forwards the Range request as it is and +# the result is NOT cached. +# # This is to stop a far ahead range request (lets say start at 17MB) # from making Squid fetch the whole object up to that point before # sending anything to the client. +# +# Multiple range_offset_limit lines may be specified, and they will +# be searched from top to bottom on each request until a match is found. +# The first match found will be used. If no line matches a request, the +# default limit of 0 bytes will be used. +# +# 'size' is the limit specified as a number of units. +# +# 'units' specifies whether to use bytes, KB, MB, etc. +# If no units are specified bytes are assumed. +# +# A size of 0 causes Squid to never fetch more than the +# client requested. (default) +# +# A size of 'none' causes Squid to always fetch the object from the +# beginning so it may cache the result. (2.0 style) +# +# 'aclname' is the name of a defined ACL. +# +# NP: Using 'none' as the byte value here will override any quick_abort settings +# that may otherwise apply to the range request. The range request will +# be fully fetched from start to finish regardless of the client +# actions. This affects bandwidth usage. +#Default: +# none + +# TAG: minimum_expiry_time (seconds) +# The minimum caching time according to (Expires - Date) +# Headers Squid honors if the object can't be revalidated +# defaults to 60 seconds. In reverse proxy environments it +# might be desirable to honor shorter object lifetimes. It +# is most likely better to make your server return a +# meaningful Last-Modified header however. In ESI environments +# where page fragments often have short lifetimes, this will +# often be best set to 0. +#Default: +# minimum_expiry_time 60 seconds + +# TAG: store_avg_object_size (bytes) +# Average object size, used to estimate number of objects your +# cache can hold. The default is 13 KB. +#Default: +# store_avg_object_size 13 KB + +# TAG: store_objects_per_bucket +# Target number of objects per bucket in the store hash table. +# Lowering this value increases the total number of buckets and +# also the storage maintenance rate. The default is 20. +#Default: +# store_objects_per_bucket 20 + +# HTTP OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: request_header_max_size (KB) +# This specifies the maximum size for HTTP headers in a request. +# Request headers are usually relatively small (about 512 bytes). +# Placing a limit on the request header size will catch certain +# bugs (for example with persistent connections) and possibly +# buffer-overflow or denial-of-service attacks. +#Default: +# request_header_max_size 64 KB + +# TAG: reply_header_max_size (KB) +# This specifies the maximum size for HTTP headers in a reply. +# Reply headers are usually relatively small (about 512 bytes). +# Placing a limit on the reply header size will catch certain +# bugs (for example with persistent connections) and possibly +# buffer-overflow or denial-of-service attacks. +#Default: +# reply_header_max_size 64 KB + +# TAG: request_body_max_size (bytes) +# This specifies the maximum size for an HTTP request body. +# In other words, the maximum size of a PUT/POST request. +# A user who attempts to send a request with a body larger +# than this limit receives an "Invalid Request" error message. +# If you set this parameter to a zero (the default), there will +# be no limit imposed. +#Default: +# request_body_max_size 0 KB + +# TAG: client_request_buffer_max_size (bytes) +# This specifies the maximum buffer size of a client request. +# It prevents squid eating too much memory when somebody uploads +# a large file. +#Default: +# client_request_buffer_max_size 512 KB + +# TAG: chunked_request_body_max_size (bytes) +# A broken or confused HTTP/1.1 client may send a chunked HTTP +# request to Squid. Squid does not have full support for that +# feature yet. To cope with such requests, Squid buffers the +# entire request and then dechunks request body to create a +# plain HTTP/1.0 request with a known content length. The plain +# request is then used by the rest of Squid code as usual. # -# A value of -1 causes Squid to always fetch the object from the -# beginning so that it may cache the result. (2.0 style) +# The option value specifies the maximum size of the buffer used +# to hold the request before the conversion. If the chunked +# request size exceeds the specified limit, the conversion +# fails, and the client receives an "unsupported request" error, +# as if dechunking was disabled. # -# A value of 0 causes Squid to never fetch more than the -# client requested. (default) +# Dechunking is enabled by default. To disable conversion of +# chunked requests, set the maximum to zero. # +# Request dechunking feature and this option in particular are a +# temporary hack. When chunking requests and responses are fully +# supported, there will be no need to buffer a chunked request. #Default: -# range_offset_limit 0 KB +# chunked_request_body_max_size 64 KB +# TAG: broken_posts +# A list of ACL elements which, if matched, causes Squid to send +# an extra CRLF pair after the body of a PUT/POST request. +# +# Some HTTP servers has broken implementations of PUT/POST, +# and rely on an extra CRLF pair sent by some WWW clients. +# +# Quote from RFC2616 section 4.1 on this matter: +# +# Note: certain buggy HTTP/1.0 client implementations generate an +# extra CRLF's after a POST request. To restate what is explicitly +# forbidden by the BNF, an HTTP/1.1 client must not preface or follow +# a request with an extra CRLF. +# +# This clause only supports fast acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. +# +#Example: +# acl buggy_server url_regex ^http://.... +# broken_posts allow buggy_server +#Default: +# none + +# TAG: adaptation_uses_indirect_client on|off +# Controls whether the indirect client IP address (instead of the direct +# client IP address) is passed to adaptation services. +# +# See also: follow_x_forwarded_for adaptation_send_client_ip +#Default: +# adaptation_uses_indirect_client on + +# TAG: via on|off +# If set (default), Squid will include a Via header in requests and +# replies as required by RFC2616. +#Default: +# via on + +# TAG: ie_refresh on|off +# Microsoft Internet Explorer up until version 5.5 Service +# Pack 1 has an issue with transparent proxies, wherein it +# is impossible to force a refresh. Turning this on provides +# a partial fix to the problem, by causing all IMS-REFRESH +# requests from older IE versions to check the origin server +# for fresh content. This reduces hit ratio by some amount +# (~10% in my experience), but allows users to actually get +# fresh content when they want it. Note because Squid +# cannot tell if the user is using 5.5 or 5.5SP1, the behavior +# of 5.5 is unchanged from old versions of Squid (i.e. a +# forced refresh is impossible). Newer versions of IE will, +# hopefully, continue to have the new behavior and will be +# handled based on that assumption. This option defaults to +# the old Squid behavior, which is better for hit ratios but +# worse for clients using IE, if they need to be able to +# force fresh content. +#Default: +# ie_refresh off + +# TAG: vary_ignore_expire on|off +# Many HTTP servers supporting Vary gives such objects +# immediate expiry time with no cache-control header +# when requested by a HTTP/1.0 client. This option +# enables Squid to ignore such expiry times until +# HTTP/1.1 is fully implemented. +# +# WARNING: If turned on this may eventually cause some +# varying objects not intended for caching to get cached. +#Default: +# vary_ignore_expire off + +# TAG: request_entities +# Squid defaults to deny GET and HEAD requests with request entities, +# as the meaning of such requests are undefined in the HTTP standard +# even if not explicitly forbidden. +# +# Set this directive to on if you have clients which insists +# on sending request entities in GET or HEAD requests. But be warned +# that there is server software (both proxies and web servers) which +# can fail to properly process this kind of request which may make you +# vulnerable to cache pollution attacks if enabled. +#Default: +# request_entities off + +# TAG: request_header_access +# Usage: request_header_access header_name allow|deny [!]aclname ... +# +# WARNING: Doing this VIOLATES the HTTP standard. Enabling +# this feature could make you liable for problems which it +# causes. +# +# This option replaces the old 'anonymize_headers' and the +# older 'http_anonymizer' option with something that is much +# more configurable. A list of ACLs for each header name allows +# removal of specific header fields under specific conditions. +# +# This option only applies to outgoing HTTP request headers (i.e., +# headers sent by Squid to the next HTTP hop such as a cache peer +# or an origin server). The option has no effect during cache hit +# detection. The equivalent adaptation vectoring point in ICAP +# terminology is post-cache REQMOD. +# +# The option is applied to individual outgoing request header +# fields. For each request header field F, Squid uses the first +# qualifying sets of request_header_access rules: +# +# 1. Rules with header_name equal to F's name. +# 2. Rules with header_name 'Other', provided F's name is not +# on the hard-coded list of commonly used HTTP header names. +# 3. Rules with header_name 'All'. +# +# Within that qualifying rule set, rule ACLs are checked as usual. +# If ACLs of an "allow" rule match, the header field is allowed to +# go through as is. If ACLs of a "deny" rule match, the header is +# removed and request_header_replace is then checked to identify +# if the removed header has a replacement. If no rules within the +# set have matching ACLs, the header field is left as is. +# +# For example, to achieve the same behavior as the old +# 'http_anonymizer standard' option, you should use: +# +# request_header_access From deny all +# request_header_access Referer deny all +# request_header_access Server deny all +# request_header_access User-Agent deny all +# request_header_access WWW-Authenticate deny all +# request_header_access Link deny all +# +# Or, to reproduce the old 'http_anonymizer paranoid' feature +# you should use: +# +# request_header_access Allow allow all +# request_header_access Authorization allow all +# request_header_access WWW-Authenticate allow all +# request_header_access Proxy-Authorization allow all +# request_header_access Proxy-Authenticate allow all +# request_header_access Cache-Control allow all +# request_header_access Content-Encoding allow all +# request_header_access Content-Length allow all +# request_header_access Content-Type allow all +# request_header_access Date allow all +# request_header_access Expires allow all +# request_header_access Host allow all +# request_header_access If-Modified-Since allow all +# request_header_access Last-Modified allow all +# request_header_access Location allow all +# request_header_access Pragma allow all +# request_header_access Accept allow all +# request_header_access Accept-Charset allow all +# request_header_access Accept-Encoding allow all +# request_header_access Accept-Language allow all +# request_header_access Content-Language allow all +# request_header_access Mime-Version allow all +# request_header_access Retry-After allow all +# request_header_access Title allow all +# request_header_access Connection allow all +# request_header_access All deny all +# +# although many of those are HTTP reply headers, and so should be +# controlled with the reply_header_access directive. +# +# By default, all headers are allowed (no anonymizing is +# performed). +#Default: +# none + +# TAG: reply_header_access +# Usage: reply_header_access header_name allow|deny [!]aclname ... +# +# WARNING: Doing this VIOLATES the HTTP standard. Enabling +# this feature could make you liable for problems which it +# causes. +# +# This option only applies to reply headers, i.e., from the +# server to the client. +# +# This is the same as request_header_access, but in the other +# direction. Please see request_header_access for detailed +# documentation. +# +# For example, to achieve the same behavior as the old +# 'http_anonymizer standard' option, you should use: +# +# reply_header_access From deny all +# reply_header_access Referer deny all +# reply_header_access Server deny all +# reply_header_access User-Agent deny all +# reply_header_access WWW-Authenticate deny all +# reply_header_access Link deny all +# +# Or, to reproduce the old 'http_anonymizer paranoid' feature +# you should use: +# +# reply_header_access Allow allow all +# reply_header_access Authorization allow all +# reply_header_access WWW-Authenticate allow all +# reply_header_access Proxy-Authorization allow all +# reply_header_access Proxy-Authenticate allow all +# reply_header_access Cache-Control allow all +# reply_header_access Content-Encoding allow all +# reply_header_access Content-Length allow all +# reply_header_access Content-Type allow all +# reply_header_access Date allow all +# reply_header_access Expires allow all +# reply_header_access Host allow all +# reply_header_access If-Modified-Since allow all +# reply_header_access Last-Modified allow all +# reply_header_access Location allow all +# reply_header_access Pragma allow all +# reply_header_access Accept allow all +# reply_header_access Accept-Charset allow all +# reply_header_access Accept-Encoding allow all +# reply_header_access Accept-Language allow all +# reply_header_access Content-Language allow all +# reply_header_access Mime-Version allow all +# reply_header_access Retry-After allow all +# reply_header_access Title allow all +# reply_header_access Connection allow all +# reply_header_access All deny all +# +# although the HTTP request headers won't be usefully controlled +# by this directive -- see request_header_access for details. +# +# By default, all headers are allowed (no anonymizing is +# performed). +#Default: +# none + +# TAG: request_header_replace +# Usage: request_header_replace header_name message +# Example: request_header_replace User-Agent Nutscrape/1.0 (CP/M; 8-bit) +# +# This option allows you to change the contents of headers +# denied with request_header_access above, by replacing them +# with some fixed string. This replaces the old fake_user_agent +# option. +# +# This only applies to request headers, not reply headers. +# +# By default, headers are removed if denied. +#Default: +# none + +# TAG: reply_header_replace +# Usage: reply_header_replace header_name message +# Example: reply_header_replace Server Foo/1.0 +# +# This option allows you to change the contents of headers +# denied with reply_header_access above, by replacing them +# with some fixed string. +# +# This only applies to reply headers, not request headers. +# +# By default, headers are removed if denied. +#Default: +# none + +# TAG: relaxed_header_parser on|off|warn +# In the default "on" setting Squid accepts certain forms +# of non-compliant HTTP messages where it is unambiguous +# what the sending application intended even if the message +# is not correctly formatted. The messages is then normalized +# to the correct form when forwarded by Squid. +# +# If set to "warn" then a warning will be emitted in cache.log +# each time such HTTP error is encountered. +# +# If set to "off" then such HTTP errors will cause the request +# or response to be rejected. +#Default: +# relaxed_header_parser on # TIMEOUTS # ----------------------------------------------------------------------------- +# TAG: forward_timeout time-units +# This parameter specifies how long Squid should at most attempt in +# finding a forwarding path for the request before giving up. +#Default: +# forward_timeout 4 minutes + # TAG: connect_timeout time-units -# Some systems (notably Linux) can not be relied upon to properly -# time out connect(2) requests. Therefore the Squid process -# enforces its own timeout on server connections. This parameter -# specifies how long to wait for the connect to complete. The -# default is two minutes (120 seconds). -# +# This parameter specifies how long to wait for the TCP connect to +# the requested server or peer to complete before Squid should +# attempt to find another path where to forward the request. #Default: -# connect_timeout 2 minutes +# connect_timeout 1 minute # TAG: peer_connect_timeout time-units # This parameter specifies how long to wait for a pending TCP # connection to a peer cache. The default is 30 seconds. You # may also set different timeout values for individual neighbors # with the 'connect-timeout' option on a 'cache_peer' line. -# #Default: # peer_connect_timeout 30 seconds -# TAG: siteselect_timeout time-units -# For URN to multiple URL's URL selection -# -#Default: -# siteselect_timeout 4 seconds - # TAG: read_timeout time-units # The read_timeout is applied on server-side connections. After # each successful read(), the timeout will be extended by this # amount. If no data is read again after this amount of time, # the request is aborted and logged with ERR_READ_TIMEOUT. The # default is 15 minutes. -# #Default: # read_timeout 15 minutes +# TAG: write_timeout time-units +# This timeout is tracked for all connections that have data +# available for writing and are waiting for the socket to become +# ready. After each successful write, the timeout is extended by +# the configured amount. If Squid has data to write but the +# connection is not ready for the configured duration, the +# transaction associated with the connection is terminated. The +# default is 15 minutes. +#Default: +# write_timeout 15 minutes + # TAG: request_timeout -# How long to wait for an HTTP request after connection -# establishment. For persistent connections, wait this long -# after the previous request completes. -# +# How long to wait for complete HTTP request headers after initial +# connection establishment. #Default: -# request_timeout 30 seconds +# request_timeout 5 minutes + +# TAG: client_idle_pconn_timeout +# How long to wait for the next HTTP request on a persistent +# client connection after the previous request completes. +#Default: +# client_idle_pconn_timeout 2 minutes # TAG: client_lifetime time-units -# The maximum amount of time that a client (browser) is allowed to +# The maximum amount of time a client (browser) is allowed to # remain connected to the cache process. This protects the Cache # from having a lot of sockets (and hence file descriptors) tied up # in a CLOSE_WAIT state from remote clients that go away without @@ -1242,8 +4201,7 @@ no_cache deny QUERY # should probably change client_lifetime only as a last resort. # If you seem to have many client connections tying up # filedescriptors, we recommend first tuning the read_timeout, -# request_timeout, pconn_timeout and quick_abort values. -# +# request_timeout, persistent_request_timeout and quick_abort values. #Default: # client_lifetime 1 day @@ -1251,35 +4209,33 @@ no_cache deny QUERY # Some clients may shutdown the sending side of their TCP # connections, while leaving their receiving sides open. Sometimes, # Squid can not tell the difference between a half-closed and a -# fully-closed TCP connection. By default, half-closed client -# connections are kept open until a read(2) or write(2) on the -# socket returns an error. Change this option to 'off' and Squid -# will immediately close client connections when read(2) returns -# "no more data to read." +# fully-closed TCP connection. # +# By default, Squid will immediately close client connections when +# read(2) returns "no more data to read." +# +# Change this option to 'on' and Squid will keep open connections +# until a read(2) or write(2) on the socket returns an error. +# This may show some benefits for reverse proxies. But if not +# it is recommended to leave OFF. #Default: -# half_closed_clients on +# half_closed_clients off -# TAG: pconn_timeout +# TAG: server_idle_pconn_timeout # Timeout for idle persistent connections to servers and other # proxies. -# #Default: -# pconn_timeout 120 seconds +# server_idle_pconn_timeout 1 minute # TAG: ident_timeout -# Maximum time to wait for IDENT requests. If this is too high, -# and you enabled 'ident_lookup', then you might be susceptible -# to denial-of-service by having many ident requests going at -# once. -# -# Only src type ACL checks are fully supported. A src_domain -# ACL might work at times, but it will not always provide -# the correct result. +# Note: This option is only available if Squid is rebuilt with the +# --enable-ident-lookups # -# This option may be disabled by using --disable-ident with -# the configure script. +# Maximum time to wait for IDENT lookups to complete. # +# If this is too high, and you enabled IDENT lookups from untrusted +# users, you might be susceptible to denial-of-service by having +# many ident requests going at once. #Default: # ident_timeout 10 seconds @@ -1289,292 +4245,103 @@ no_cache deny QUERY # This value is the lifetime to set for all open descriptors # during shutdown mode. Any active clients after this many # seconds will receive a 'timeout' message. -# #Default: # shutdown_lifetime 30 seconds -# https://qa.mandriva.com/show_bug.cgi?id=37801 +# shutdown_lifetime 5 seconds -# ACCESS CONTROLS +# ADMINISTRATIVE PARAMETERS # ----------------------------------------------------------------------------- -# TAG: acl -# Defining an Access List -# -# acl aclname acltype string1 ... -# acl aclname acltype "file" ... -# -# when using "file", the file should contain one item per line -# -# acltype is one of src dst srcdomain dstdomain url_pattern -# urlpath_pattern time port proto method browser user -# -# By default, regular expressions are CASE-SENSITIVE. To make -# them case-insensitive, use the -i option. -# -# acl aclname src ip-address/netmask ... (clients IP address) -# acl aclname src addr1-addr2/netmask ... (range of addresses) -# acl aclname dst ip-address/netmask ... (URL host's IP address) -# acl aclname myip ip-address/netmask ... (local socket IP address) -# -# acl aclname srcdomain .foo.com ... # reverse lookup, client IP -# acl aclname dstdomain .foo.com ... # Destination server from URL -# acl aclname srcdom_regex [-i] xxx ... # regex matching client name -# acl aclname dstdom_regex [-i] xxx ... # regex matching server -# # For dstdomain and dstdom_regex a reverse lookup is tried if a IP -# # based URL is used. The name "none" is used if the reverse lookup -# # fails. -# -# acl aclname time [day-abbrevs] [h1:m1-h2:m2] -# day-abbrevs: -# S - Sunday -# M - Monday -# T - Tuesday -# W - Wednesday -# H - Thursday -# F - Friday -# A - Saturday -# h1:m1 must be less than h2:m2 -# acl aclname url_regex [-i] ^http:// ... # regex matching on whole URL -# acl aclname urlpath_regex [-i] \.gif$ ... # regex matching on URL path -# acl aclname port 80 70 21 ... -# acl aclname port 0-1024 ... # ranges allowed -# acl aclname myport 3128 ... # (local socket TCP port) -# acl aclname proto HTTP FTP ... -# acl aclname method GET POST ... -# acl aclname browser [-i] regexp -# # pattern match on User-Agent header -# acl aclname ident username ... -# acl aclname ident_regex [-i] pattern ... -# # string match on ident output. -# # use REQUIRED to accept any non-null ident. -# acl aclname src_as number ... -# acl aclname dst_as number ... -# # Except for access control, AS numbers can be used for -# # routing of requests to specific caches. Here's an -# # example for routing all requests for AS#1241 and only -# # those to mycache.mydomain.net: -# # acl asexample dst_as 1241 -# # cache_peer_access mycache.mydomain.net allow asexample -# # cache_peer_access mycache_mydomain.net deny all -# -# acl aclname proxy_auth username ... -# acl aclname proxy_auth_regex [-i] pattern ... -# # list of valid usernames -# # use REQUIRED to accept any valid username. -# # -# # NOTE: when a Proxy-Authentication header is sent but it is not -# # needed during ACL checking the username is NOT logged -# # in access.log. -# # -# # NOTE: proxy_auth requires a EXTERNAL authentication program -# # to check username/password combinations (see -# # authenticate_program). -# # -# # WARNING: proxy_auth can't be used in a transparent proxy. It -# # collides with any authentication done by origin servers. It may -# # seem like it works at first, but it doesn't. -# -# acl aclname snmp_community string ... -# # A community string to limit access to your SNMP Agent -# # Example: -# # -# # acl snmppublic snmp_community public -# -# acl aclname maxconn number -# # This will be matched when the client's IP address has -# # more than <number> HTTP connections established. -# -# acl req_mime_type mime-type1 ... -# # regex match agains the mime type of the request generated -# # by the client. Can be used to detect file upload or some -# # types HTTP tunelling requests. -# # NOTE: This does NOT match the reply. You cannot use this -# # to match the returned file type. -# -#Examples: -#acl myexample dst_as 1241 -#acl mynetwork src -#acl password proxy_auth REQUIRED -#acl fileupload req_mime_type -i ^multipart/form-data$ -# -#Recommended minimum configuration: -acl all src 0.0.0.0/0.0.0.0 -acl manager proto cache_object -acl localhost src 127.0.0.1/255.255.255.255 -acl SSL_ports port 443 563 -acl Safe_ports port 80 # http -acl Safe_ports port 21 # ftp -acl Safe_ports port 443 563 # https, snews -acl Safe_ports port 70 # gopher -acl Safe_ports port 210 # wais -acl Safe_ports port 1025-65535 # unregistered ports -acl Safe_ports port 280 # http-mgmt -acl Safe_ports port 488 # gss-http -acl Safe_ports port 591 # filemaker -acl Safe_ports port 777 # multiling http -acl CONNECT method CONNECT - -# TAG: http_access -# Allowing or Denying access based on defined access lists -# -# Access to the HTTP port: -# http_access allow|deny [!]aclname ... -# -# NOTE on default values: -# -# If there are no "access" lines present, the default is to deny -# the request. -# -# If none of the "access" lines cause a match, the default is the -# opposite of the last line in the list. If the last line was -# deny, then the default is allow. Conversely, if the last line -# is allow, the default will be deny. For these reasons, it is a -# good idea to have an "deny all" or "allow all" entry at the end -# of your access lists to avoid potential confusion. -# -#Default: -# http_access deny all -# -#Recommended minimum configuration: -# -# Only allow cachemgr access from localhost -http_access allow manager localhost -http_access deny manager -# Deny requests to unknown ports -http_access deny !Safe_ports -# Deny CONNECT to other than SSL ports -http_access deny CONNECT !SSL_ports -# -# INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS -# -# And finally deny all other access to this proxy -http_access allow localhost -http_access deny all - -# TAG: icp_access -# Allowing or Denying access to the ICP port based on defined -# access lists -# -# icp_access allow|deny [!]aclname ... -# -# See http_access for details -# +# TAG: cache_mgr +# Email-address of local cache manager who will receive +# mail if the cache dies. The default is "webmaster." #Default: -# icp_access deny all -# -#Allow ICP queries from eveyone -icp_access allow all - -# TAG: miss_access -# Use to force your neighbors to use you as a sibling instead of -# a parent. For example: -# -# acl localclients src 172.16.0.0/16 -# miss_access allow localclients -# miss_access deny !localclients -# -# This means that only your local clients are allowed to fetch -# MISSES and all other clients can only fetch HITS. -# -# By default, allow all clients who passed the http_access rules -# to fetch MISSES from us. -# -#Default setting: -# miss_access allow all +# cache_mgr root -# TAG: cache_peer_access -# Similar to 'cache_peer_domain' but provides more flexibility by -# using ACL elements. -# -# cache_peer_access cache-host allow|deny [!]aclname ... -# -# The syntax is identical to 'http_access' and the other lists of -# ACL elements. See the comments for 'http_access' below, or -# the Squid FAQ (http://www.squid-cache.org/FAQ/FAQ-10.html). -# +# TAG: mail_from +# From: email-address for mail sent when the cache dies. +# The default is to use 'appname@unique_hostname'. +# Default appname value is "squid", can be changed into +# src/globals.h before building squid. #Default: # none -# TAG: proxy_auth_realm -# Specifies the realm name which is to be reported to the client for -# proxy authentication (part of the text the user will see when -# prompted their username and password). +# TAG: mail_program +# Email program used to send mail if the cache dies. +# The default is "mail". The specified program must comply +# with the standard Unix mail syntax: +# mail-program recipient < mailfile # +# Optional command line options can be specified. #Default: -# proxy_auth_realm Squid proxy-caching web server +# mail_program mail -# TAG: ident_lookup_access -# A list of ACL elements which, if matched, cause an ident -# (RFC 931) lookup to be performed for this request. For -# example, you might choose to always perform ident lookups -# for your main multi-user Unix boxes, but not for your Macs -# and PCs. By default, ident lookups are not performed for -# any requests. -# -# To enable ident lookups for specific client addresses, you -# can follow this example: -# -# acl ident_aware_hosts src 198.168.1.0/255.255.255.0 -# ident_lookup_access allow ident_aware_hosts -# ident_lookup_access deny all -# -# This option may be disabled by using --disable-ident with -# the configure script. -# +# TAG: cache_effective_user +# If you start Squid as root, it will change its effective/real +# UID/GID to the user specified below. The default is to change +# to UID of squid. +# see also; cache_effective_group #Default: -# ident_lookup_access deny all - - -# ADMINISTRATIVE PARAMETERS -# ----------------------------------------------------------------------------- - -# TAG: cache_mgr -# Email-address of local cache manager who will receive -# mail if the cache dies. The default is "webmaster." +# cache_effective_user squid # -#Default: -# cache_mgr root +cache_effective_user squid -# TAG: cache_effective_user # TAG: cache_effective_group +# Squid sets the GID to the effective user's default group ID +# (taken from the password file) and supplementary group list +# from the groups membership. # -# If the cache is run as root, it will change its effective/real -# UID/GID to the UID/GID specified below. The default is to -# change to UID to nobody and GID to nobody. +# If you want Squid to run with a specific GID regardless of +# the group memberships of the effective user then set this +# to the group (or GID) you want Squid to run as. When set +# all other group privileges of the effective user are ignored +# and only this GID is effective. If Squid is not started as +# root the user starting Squid MUST be member of the specified +# group. # -# If Squid is not started as root, the default is to keep the -# current UID/GID. Note that if Squid is not started as root then -# you cannot set http_port to a value lower than 1024. +# This option is not recommended by the Squid Team. +# Our preference is for administrators to configure a secure +# user account for squid with UID/GID matching system policies. +#Default: +# cache_effective_group squid # +cache_effective_group squid + +# TAG: httpd_suppress_version_string on|off +# Suppress Squid version string info in HTTP headers and HTML error pages. #Default: -# cache_effective_user nobody -# cache_effective_group nobody +# httpd_suppress_version_string off # TAG: visible_hostname # If you want to present a special hostname in error messages, etc, -# then define this. Otherwise, the return value of gethostname() +# define this. Otherwise, the return value of gethostname() # will be used. If you have multiple caches in a cluster and # get errors about IP-forwarding you must set them to have individual # names with this setting. -# #Default: -# none +# visible_hostname unconfigured # TAG: unique_hostname # If you want to have multiple machines with the same -# 'visible_hostname' then you must give each machine a different -# 'unique_hostname' so that forwarding loops can be detected. -# +# 'visible_hostname' you must give each machine a different +# 'unique_hostname' so forwarding loops can be detected. #Default: # none # TAG: hostname_aliases -# A list of other DNS names that your cache has. -# +# A list of other DNS names your cache has. #Default: # none +# TAG: umask +# Minimum umask which should be enforced while the proxy +# is running, in addition to the umask set at startup. +# +# For a traditional octal representation of umasks, start +# your value with 0. +#Default: +# umask 027 # OPTIONS FOR THE CACHE REGISTRATION SERVICE # ----------------------------------------------------------------------------- @@ -1603,17 +4370,21 @@ icp_access allow all # default is `0' which disables sending the announcement # messages. # -# To enable announcing your cache, just uncomment the line -# below. +# To enable announcing your cache, just set an announce period. # +# Example: +# announce_period 1 day #Default: # announce_period 0 -# -#To enable announcing your cache, just uncomment the line below. -#announce_period 1 day # TAG: announce_host +#Default: +# announce_host tracker.ircache.net + # TAG: announce_file +#Default: +# none + # TAG: announce_port # announce_host and announce_port set the hostname and port # number where the registration message will be sent. @@ -1622,333 +4393,693 @@ icp_access allow all # default default to 3131. If the 'filename' argument is given, # the contents of that file will be included in the announce # message. -# #Default: -# announce_host tracker.ircache.net # announce_port 3131 - # HTTPD-ACCELERATOR OPTIONS # ----------------------------------------------------------------------------- -# TAG: httpd_accel_host -# TAG: httpd_accel_port -# If you want to run Squid as an httpd accelerator, define the -# host name and port number where the real HTTP server is. +# TAG: httpd_accel_surrogate_id +# Surrogates (http://www.esi.org/architecture_spec_1.0.html) +# need an identification token to allow control targeting. Because +# a farm of surrogates may all perform the same tasks, they may share +# an identification token. # -# If you want virtual host support then specify the hostname -# as "virtual". -# -# If you want virtual port support then specify the port as "0". -# -# NOTE: enabling httpd_accel_host disables proxy-caching and -# ICP. If you want these features enabled also, then set -# the 'httpd_accel_with_proxy' option. +# The default ID is the visible_hostname +#Default: +# none + +# TAG: http_accel_surrogate_remote on|off +# Remote surrogates (such as those in a CDN) honour Surrogate-Control: no-store-remote. +# Set this to on to have squid behave as a remote surrogate. +#Default: +# http_accel_surrogate_remote off + +# TAG: esi_parser libxml2|expat|custom +# Note: This option is only available if Squid is rebuilt with the +# --enable-esi # +# ESI markup is not strictly XML compatible. The custom ESI parser +# will give higher performance, but cannot handle non ASCII character +# encodings. #Default: -# httpd_accel_port 80 +# esi_parser custom -# TAG: httpd_accel_single_host on|off -# If you are running Squid as a accelerator and have a single backend -# server then set this to on. This causes Squid to forward the request -# to this server irregardles of what any redirectors or Host headers -# says. +# DELAY POOL PARAMETERS +# ----------------------------------------------------------------------------- + +# TAG: delay_pools +# This represents the number of delay pools to be used. For example, +# if you have one class 2 delay pool and one class 3 delays pool, you +# have a total of 2 delay pools. +#Default: +# delay_pools 0 + +# TAG: delay_class +# This defines the class of each delay pool. There must be exactly one +# delay_class line for each delay pool. For example, to define two +# delay pools, one of class 2 and one of class 3, the settings above +# and here would be: +# +# Example: +# delay_pools 4 # 4 delay pools +# delay_class 1 2 # pool 1 is a class 2 pool +# delay_class 2 3 # pool 2 is a class 3 pool +# delay_class 3 4 # pool 3 is a class 4 pool +# delay_class 4 5 # pool 4 is a class 5 pool # -# Leave this at off if you have multiple backend servers, and use a -# redirector (or host table or private DNS) to map the requests to the -# appropriate backend servers. Note that the mapping needs to be a -# 1-1 mapping between requested and backend (from redirector) domain -# names or caching will fail, as cacing is performed using the -# URL returned from the redirector. +# The delay pool classes are: # -# See also redirect_rewrites_host_header. +# class 1 Everything is limited by a single aggregate +# bucket. # +# class 2 Everything is limited by a single aggregate +# bucket as well as an "individual" bucket chosen +# from bits 25 through 32 of the IPv4 address. +# +# class 3 Everything is limited by a single aggregate +# bucket as well as a "network" bucket chosen +# from bits 17 through 24 of the IP address and a +# "individual" bucket chosen from bits 17 through +# 32 of the IPv4 address. +# +# class 4 Everything in a class 3 delay pool, with an +# additional limit on a per user basis. This +# only takes effect if the username is established +# in advance - by forcing authentication in your +# http_access rules. +# +# class 5 Requests are grouped according their tag (see +# external_acl's tag= reply). +# +# +# Each pool also requires a delay_parameters directive to configure the pool size +# and speed limits used whenever the pool is applied to a request. Along with +# a set of delay_access directives to determine when it is used. +# +# NOTE: If an IP address is a.b.c.d +# -> bits 25 through 32 are "d" +# -> bits 17 through 24 are "c" +# -> bits 17 through 32 are "c * 256 + d" +# +# NOTE-2: Due to the use of bitmasks in class 2,3,4 pools they only apply to +# IPv4 traffic. Class 1 and 5 pools may be used with IPv6 traffic. #Default: -# httpd_accel_single_host off +# none -# TAG: httpd_accel_with_proxy on|off -# If you want to use Squid as both a local httpd accelerator -# and as a proxy, change this to 'on'. Note however that your -# proxy users may have trouble to reach the accelerated domains -# unless their browsers are configured not to use this proxy for -# those domains (for example via the no_proxy browser configuration -# setting) +# TAG: delay_access +# This is used to determine which delay pool a request falls into. +# +# delay_access is sorted per pool and the matching starts with pool 1, +# then pool 2, ..., and finally pool N. The first delay pool where the +# request is allowed is selected for the request. If it does not allow +# the request to any pool then the request is not delayed (default). # +# For example, if you want some_big_clients in delay +# pool 1 and lotsa_little_clients in delay pool 2: +# +#Example: +# delay_access 1 allow some_big_clients +# delay_access 1 deny all +# delay_access 2 allow lotsa_little_clients +# delay_access 2 deny all +# delay_access 3 allow authenticated_clients #Default: -# httpd_accel_with_proxy off +# none -# TAG: httpd_accel_uses_host_header on|off -# HTTP/1.1 requests include a Host: header which is basically the -# hostname from the URL. Squid can be an accelerator for -# different HTTP servers by looking at this header. However, -# Squid does NOT check the value of the Host header, so it opens -# a big security hole. We recommend that this option remain -# disabled unless you are sure of what you are doing. +# TAG: delay_parameters +# This defines the parameters for a delay pool. Each delay pool has +# a number of "buckets" associated with it, as explained in the +# description of delay_class. +# +# For a class 1 delay pool, the syntax is: +# delay_pools pool 1 +# delay_parameters pool aggregate +# +# For a class 2 delay pool: +# delay_pools pool 2 +# delay_parameters pool aggregate individual +# +# For a class 3 delay pool: +# delay_pools pool 3 +# delay_parameters pool aggregate network individual +# +# For a class 4 delay pool: +# delay_pools pool 4 +# delay_parameters pool aggregate network individual user +# +# For a class 5 delay pool: +# delay_pools pool 5 +# delay_parameters pool tagrate +# +# The option variables are: +# +# pool a pool number - ie, a number between 1 and the +# number specified in delay_pools as used in +# delay_class lines. +# +# aggregate the speed limit parameters for the aggregate bucket +# (class 1, 2, 3). +# +# individual the speed limit parameters for the individual +# buckets (class 2, 3). +# +# network the speed limit parameters for the network buckets +# (class 3). +# +# user the speed limit parameters for the user buckets +# (class 4). +# +# tagrate the speed limit parameters for the tag buckets +# (class 5). +# +# A pair of delay parameters is written restore/maximum, where restore is +# the number of bytes (not bits - modem and network speeds are usually +# quoted in bits) per second placed into the bucket, and maximum is the +# maximum number of bytes which can be in the bucket at any time. # -# However, you will need to enable this option if you run Squid -# as a transparent proxy. Otherwise, virtual servers which -# require the Host: header will not be properly cached. +# There must be one delay_parameters line for each delay pool. +# +# +# For example, if delay pool number 1 is a class 2 delay pool as in the +# above example, and is being used to strictly limit each host to 64Kbit/sec +# (plus overheads), with no overall limit, the line is: +# +# delay_parameters 1 -1/-1 8000/8000 # +# Note that 8 x 8000 KByte/sec -> 64Kbit/sec. +# +# Note that the figure -1 is used to represent "unlimited". +# +# +# And, if delay pool number 2 is a class 3 delay pool as in the above +# example, and you want to limit it to a total of 256Kbit/sec (strict limit) +# with each 8-bit network permitted 64Kbit/sec (strict limit) and each +# individual host permitted 4800bit/sec with a bucket maximum size of 64Kbits +# to permit a decent web page to be downloaded at a decent speed +# (if the network is not being limited due to overuse) but slow down +# large downloads more significantly: +# +# delay_parameters 2 32000/32000 8000/8000 600/8000 +# +# Note that 8 x 32000 KByte/sec -> 256Kbit/sec. +# 8 x 8000 KByte/sec -> 64Kbit/sec. +# 8 x 600 Byte/sec -> 4800bit/sec. +# +# +# Finally, for a class 4 delay pool as in the example - each user will +# be limited to 128Kbits/sec no matter how many workstations they are logged into.: +# +# delay_parameters 4 32000/32000 8000/8000 600/64000 16000/16000 #Default: -# httpd_accel_uses_host_header off +# none +# TAG: delay_initial_bucket_level (percent, 0-100) +# The initial bucket percentage is used to determine how much is put +# in each bucket when squid starts, is reconfigured, or first notices +# a host accessing it (in class 2 and class 3, individual hosts and +# networks only have buckets associated with them once they have been +# "seen" by squid). +#Default: +# delay_initial_bucket_level 50 -# MISCELLANEOUS +# CLIENT DELAY POOL PARAMETERS # ----------------------------------------------------------------------------- -# TAG: dns_testnames -# The DNS tests exit as soon as the first site is successfully looked up -# -# This test can be disabled with the -D command line option. +# TAG: client_delay_pools +# This option specifies the number of client delay pools used. It must +# preceed other client_delay_* options. # +#Example: +# client_delay_pools 2 #Default: -# dns_testnames netscape.com internic.net nlanr.net microsoft.com +# client_delay_pools 0 -# TAG: logfile_rotate -# Specifies the number of logfile rotations to make when you -# type 'squid -k rotate'. The default is 10, which will rotate -# with extensions 0 through 9. Setting logfile_rotate to 0 will -# disable the rotation, but the logfiles are still closed and -# re-opened. This will enable you to rename the logfiles -# yourself just before sending the rotate signal. +# TAG: client_delay_initial_bucket_level (percent, 0-no_limit) +# This option determines the initial bucket size as a percentage of +# max_bucket_size from client_delay_parameters. Buckets are created +# at the time of the "first" connection from the matching IP. Idle +# buckets are periodically deleted up. # -# Note, the 'squid -k rotate' command normally sends a USR1 -# signal to the running squid process. In certain situations -# (e.g. on Linux with Async I/O), USR1 is used for other -# purposes, so -k rotate uses another signal. It is best to get -# in the habit of using 'squid -k rotate' instead of 'kill -USR1 -# <pid>'. +# You can specify more than 100 percent but note that such "oversized" +# buckets are not refilled until their size goes down to max_bucket_size +# from client_delay_parameters. # +#Example: +# client_delay_initial_bucket_level 50 #Default: -# logfile_rotate 0 +# client_delay_initial_bucket_level 50 -# TAG: append_domain -# Appends local domain name to hostnames without any dots in -# them. append_domain must begin with a period. +# TAG: client_delay_parameters +# +# This option configures client-side bandwidth limits using the +# following format: +# +# client_delay_parameters pool speed_limit max_bucket_size +# +# pool is an integer ID used for client_delay_access matching. +# +# speed_limit is bytes added to the bucket per second. +# +# max_bucket_size is the maximum size of a bucket, enforced after any +# speed_limit additions. +# +# Please see the delay_parameters option for more information and +# examples. # #Example: -# append_domain .yourdomain.com +# client_delay_parameters 1 1024 2048 +# client_delay_parameters 2 51200 16384 +#Default: +# none + +# TAG: client_delay_access +# +# This option determines the client-side delay pool for the +# request: +# +# client_delay_access pool_ID allow|deny acl_name # +# All client_delay_access options are checked in their pool ID +# order, starting with pool 1. The first checked pool with allowed +# request is selected for the request. If no ACL matches or there +# are no client_delay_access options, the request bandwidth is not +# limited. +# +# The ACL-selected pool is then used to find the +# client_delay_parameters for the request. Client-side pools are +# not used to aggregate clients. Clients are always aggregated +# based on their source IP addresses (one bucket per source IP). +# +# Please see delay_access for more examples. +# +#Example: +# client_delay_access 1 allow low_rate_network +# client_delay_access 2 allow vips_network #Default: # none -# TAG: tcp_recv_bufsize (bytes) -# Size of receive buffer to set for TCP sockets. Probably just -# as easy to change your kernel's default. Set to zero to use -# the default buffer size. +# WCCPv1 AND WCCPv2 CONFIGURATION OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: wccp_router +# Use this option to define your WCCP ``home'' router for +# Squid. +# +# wccp_router supports a single WCCP(v1) router # +# wccp2_router supports multiple WCCPv2 routers +# +# only one of the two may be used at the same time and defines +# which version of WCCP to use. #Default: -# tcp_recv_bufsize 0 bytes +# wccp_router any_addr -# TAG: err_html_text -# HTML text to include in error messages. Make this a "mailto" -# URL to your admin address, or maybe just a link to your -# organizations Web page. +# TAG: wccp2_router +# Use this option to define your WCCP ``home'' router for +# Squid. # -# To include this in your error messages, you must rewrite -# the error template files (found in the "errors" directory). -# Wherever you want the 'err_html_text' line to appear, -# insert a %L tag in the error template file. +# wccp_router supports a single WCCP(v1) router +# +# wccp2_router supports multiple WCCPv2 routers # +# only one of the two may be used at the same time and defines +# which version of WCCP to use. #Default: # none -# TAG: deny_info -# Usage: deny_info err_page_name acl -# Example: deny_info ERR_CUSTOM_ACCESS_DENIED bad_guys +# TAG: wccp_version +# This directive is only relevant if you need to set up WCCP(v1) +# to some very old and end-of-life Cisco routers. In all other +# setups it must be left unset or at the default setting. +# It defines an internal version in the WCCP(v1) protocol, +# with version 4 being the officially documented protocol. # -# This can be used to return a ERR_ page for requests which -# do not pass the 'http_access' rules. A single ACL will cause -# the http_access check to fail. If a 'deny_info' line exists -# for that ACL then Squid returns a corresponding error page. +# According to some users, Cisco IOS 11.2 and earlier only +# support WCCP version 3. If you're using that or an earlier +# version of IOS, you may need to change this value to 3, otherwise +# do not specify this parameter. +#Default: +# wccp_version 4 + +# TAG: wccp2_rebuild_wait +# If this is enabled Squid will wait for the cache dir rebuild to finish +# before sending the first wccp2 HereIAm packet +#Default: +# wccp2_rebuild_wait on + +# TAG: wccp2_forwarding_method +# WCCP2 allows the setting of forwarding methods between the +# router/switch and the cache. Valid values are as follows: # -# You may use ERR_ pages that come with Squid or create your own pages -# and put them into the configured errors/ directory. +# gre - GRE encapsulation (forward the packet in a GRE/WCCP tunnel) +# l2 - L2 redirect (forward the packet using Layer 2/MAC rewriting) # +# Currently (as of IOS 12.4) cisco routers only support GRE. +# Cisco switches only support the L2 redirect assignment method. #Default: -# none +# wccp2_forwarding_method gre -# TAG: memory_pools on|off -# If set, Squid will keep pools of allocated (but unused) memory -# available for future use. If memory is a premium on your -# system and you believe your malloc library outperforms Squid -# routines, disable this. +# TAG: wccp2_return_method +# WCCP2 allows the setting of return methods between the +# router/switch and the cache for packets that the cache +# decides not to handle. Valid values are as follows: +# +# gre - GRE encapsulation (forward the packet in a GRE/WCCP tunnel) +# l2 - L2 redirect (forward the packet using Layer 2/MAC rewriting) +# +# Currently (as of IOS 12.4) cisco routers only support GRE. +# Cisco switches only support the L2 redirect assignment. # +# If the "ip wccp redirect exclude in" command has been +# enabled on the cache interface, then it is still safe for +# the proxy server to use a l2 redirect method even if this +# option is set to GRE. #Default: -# memory_pools on +# wccp2_return_method gre -# TAG: memory_pools_limit (bytes) -# Used only with memory_pools on: -# memory_pools_limit 50 MB +# TAG: wccp2_assignment_method +# WCCP2 allows the setting of methods to assign the WCCP hash +# Valid values are as follows: # -# If set to a non-zero value, Squid will keep at most the specified -# limit of allocated (but unused) memory in memory pools. All free() -# requests that exceed this limit will be handled by your malloc -# library. Squid does not pre-allocate any memory, just safe-keeps -# objects that otherwise would be free()d. Thus, it is safe to set -# memory_pools_limit to a reasonably high value even if your -# configuration will use less memory. +# hash - Hash assignment +# mask - Mask assignment # -# If not set (default) or set to zero, Squid will keep all memory it -# can. That is, there will be no limit on the total amount of memory -# used for safe-keeping. +# As a general rule, cisco routers support the hash assignment method +# and cisco switches support the mask assignment method. +#Default: +# wccp2_assignment_method hash + +# TAG: wccp2_service +# WCCP2 allows for multiple traffic services. There are two +# types: "standard" and "dynamic". The standard type defines +# one service id - http (id 0). The dynamic service ids can be from +# 51 to 255 inclusive. In order to use a dynamic service id +# one must define the type of traffic to be redirected; this is done +# using the wccp2_service_info option. # -# To disable memory allocation optimization, do not set -# memory_pools_limit to 0. Set memory_pools to "off" instead. +# The "standard" type does not require a wccp2_service_info option, +# just specifying the service id will suffice. # -# An overhead for maintaining memory pools is not taken into account -# when the limit is checked. This overhead is close to four bytes per -# object kept. However, pools may actually _save_ memory because of -# reduced memory thrashing in your malloc library. +# MD5 service authentication can be enabled by adding +# "password=<password>" to the end of this service declaration. +# +# Examples: # +# wccp2_service standard 0 # for the 'web-cache' standard service +# wccp2_service dynamic 80 # a dynamic service type which will be +# # fleshed out with subsequent options. +# wccp2_service standard 0 password=foo #Default: -# none +# wccp2_service standard 0 -# TAG: forwarded_for on|off -# If set, Squid will include your system's IP address or name -# in the HTTP requests it forwards. By default it looks like -# this: +# TAG: wccp2_service_info +# Dynamic WCCPv2 services require further information to define the +# traffic you wish to have diverted. # -# X-Forwarded-For: 192.1.2.3 +# The format is: # -# If you disable this, it will appear as +# wccp2_service_info <id> protocol=<protocol> flags=<flag>,<flag>.. +# priority=<priority> ports=<port>,<port>.. # -# X-Forwarded-For: unknown +# The relevant WCCPv2 flags: +# + src_ip_hash, dst_ip_hash +# + source_port_hash, dst_port_hash +# + src_ip_alt_hash, dst_ip_alt_hash +# + src_port_alt_hash, dst_port_alt_hash +# + ports_source +# +# The port list can be one to eight entries. +# +# Example: # +# wccp2_service_info 80 protocol=tcp flags=src_ip_hash,ports_source +# priority=240 ports=80 +# +# Note: the service id must have been defined by a previous +# 'wccp2_service dynamic <id>' entry. #Default: -# forwarded_for on +# none -# TAG: log_icp_queries on|off -# If set, ICP queries are logged to access.log. You may wish -# do disable this if your ICP load is VERY high to speed things -# up or to simplify log analysis. +# TAG: wccp2_weight +# Each cache server gets assigned a set of the destination +# hash proportional to their weight. +#Default: +# wccp2_weight 10000 + +# TAG: wccp_address +#Default: +# wccp_address 0.0.0.0 + +# TAG: wccp2_address +# Use this option if you require WCCP to use a specific +# interface address. # +# The default behavior is to not bind to any specific address. #Default: -# log_icp_queries on +# wccp2_address 0.0.0.0 -# TAG: icp_hit_stale on|off -# If you want to return ICP_HIT for stale cache objects, set this -# option to 'on'. If you have sibling relationships with caches -# in other administrative domains, this should be 'off'. If you only -# have sibling relationships with caches under your control, then -# it is probably okay to set this to 'on'. +# PERSISTENT CONNECTION HANDLING +# ----------------------------------------------------------------------------- # +# Also see "pconn_timeout" in the TIMEOUTS section + +# TAG: client_persistent_connections #Default: -# icp_hit_stale off +# client_persistent_connections on -# TAG: minimum_direct_hops -# If using the ICMP pinging stuff, do direct fetches for sites -# which are no more than this many hops away. +# TAG: server_persistent_connections +# Persistent connection support for clients and servers. By +# default, Squid uses persistent connections (when allowed) +# with its clients and servers. You can use these options to +# disable persistent connections with clients and/or servers. +#Default: +# server_persistent_connections on + +# TAG: persistent_connection_after_error +# With this directive the use of persistent connections after +# HTTP errors can be disabled. Useful if you have clients +# who fail to handle errors on persistent connections proper. +#Default: +# persistent_connection_after_error on + +# TAG: detect_broken_pconn +# Some servers have been found to incorrectly signal the use +# of HTTP/1.0 persistent connections even on replies not +# compatible, causing significant delays. This server problem +# has mostly been seen on redirects. # +# By enabling this directive Squid attempts to detect such +# broken replies and automatically assume the reply is finished +# after 10 seconds timeout. #Default: -# minimum_direct_hops 4 +# detect_broken_pconn off -# TAG: minimum_direct_rtt -# If using the ICMP pinging stuff, do direct fetches for sites -# which are no more than this many rtt milliseconds away. +# CACHE DIGEST OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: digest_generation +# This controls whether the server will generate a Cache Digest +# of its contents. By default, Cache Digest generation is +# enabled if Squid is compiled with --enable-cache-digests defined. +#Default: +# digest_generation on + +# TAG: digest_bits_per_entry +# This is the number of bits of the server's Cache Digest which +# will be associated with the Digest entry for a given HTTP +# Method and URL (public key) combination. The default is 5. +#Default: +# digest_bits_per_entry 5 + +# TAG: digest_rebuild_period (seconds) +# This is the wait time between Cache Digest rebuilds. +#Default: +# digest_rebuild_period 1 hour + +# TAG: digest_rewrite_period (seconds) +# This is the wait time between Cache Digest writes to +# disk. +#Default: +# digest_rewrite_period 1 hour + +# TAG: digest_swapout_chunk_size (bytes) +# This is the number of bytes of the Cache Digest to write to +# disk at a time. It defaults to 4096 bytes (4KB), the Squid +# default swap page. +#Default: +# digest_swapout_chunk_size 4096 bytes + +# TAG: digest_rebuild_chunk_percentage (percent, 0-100) +# This is the percentage of the Cache Digest to be scanned at a +# time. By default it is set to 10% of the Cache Digest. +#Default: +# digest_rebuild_chunk_percentage 10 + +# SNMP OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: snmp_port +# The port number where Squid listens for SNMP requests. To enable +# SNMP support set this to a suitable port number. Port number +# 3401 is often used for the Squid SNMP agent. By default it's +# set to "0" (disabled) # +# Example: +# snmp_port 3401 #Default: -# minimum_direct_rtt 400 +# snmp_port 0 -# TAG: cachemgr_passwd -# Specify passwords for cachemgr operations. +# TAG: snmp_access +# Allowing or denying access to the SNMP port. # -# Usage: cachemgr_passwd password action action ... +# All access to the agent is denied by default. +# usage: # -# Some valid actions are (see cache manager menu for a full list): -# 5min -# 60min -# asndb -# authenticator -# cbdata -# client_list -# comm_incoming -# config * -# counters -# delay -# digest_stats -# dns -# events -# filedescriptors -# fqdncache -# histograms -# http_headers -# info -# io -# ipcache -# mem -# menu -# netdb -# non_peers -# objects -# pconn -# peer_select -# redirector -# refresh -# server_list -# shutdown * -# store_digest -# storedir -# utilization -# via_headers -# vm_objects +# snmp_access allow|deny [!]aclname ... # -# * Indicates actions which will not be performed without a -# valid password, others can be performed if not listed here. +# This clause only supports fast acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. +#Example: +# snmp_access allow snmppublic localhost +# snmp_access deny all +#Default: +# snmp_access deny all + +# TAG: snmp_incoming_address +#Default: +# snmp_incoming_address any_addr + +# TAG: snmp_outgoing_address +# Just like 'udp_incoming_address', but for the SNMP port. # -# To disable an action, set the password to "disable". -# To allow performing an action without a password, set the -# password to "none". +# snmp_incoming_address is used for the SNMP socket receiving +# messages from SNMP agents. +# snmp_outgoing_address is used for SNMP packets returned to SNMP +# agents. # -# Use the keyword "all" to set the same password for all actions. +# The default snmp_incoming_address is to listen on all +# available network interfaces. # -#Example: -# cachemgr_passwd secret shutdown -# cachemgr_passwd lesssssssecret info stats/objects -# cachemgr_passwd disable all +# If snmp_outgoing_address is not set it will use the same socket +# as snmp_incoming_address. Only change this if you want to have +# SNMP replies sent using another address than where this Squid +# listens for SNMP queries. # +# NOTE, snmp_incoming_address and snmp_outgoing_address can not have +# the same value since they both use port 3401. #Default: -# none +# snmp_outgoing_address no_addr -# TAG: store_avg_object_size (kbytes) -# Average object size, used to estimate number of objects your -# cache can hold. See doc/Release-Notes-1.1.txt. The default is -# 13 KB. +# ICP OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: icp_port +# The port number where Squid sends and receives ICP queries to +# and from neighbor caches. The standard UDP port for ICP is 3130. +# Default is disabled (0). # +# Example: +# icp_port 3130 #Default: -# store_avg_object_size 13 KB +# icp_port 0 -# TAG: store_objects_per_bucket -# Target number of objects per bucket in the store hash table. -# Lowering this value increases the total number of buckets and -# also the storage maintenance rate. The default is 50. +# TAG: htcp_port +# The port number where Squid sends and receives HTCP queries to +# and from neighbor caches. To turn it on you want to set it to +# 4827. By default it is set to "0" (disabled). # +# Example: +# htcp_port 4827 #Default: -# store_objects_per_bucket 20 +# htcp_port 0 -# TAG: client_db on|off -# If you want to disable collecting per-client statistics, then -# turn off client_db here. +# TAG: log_icp_queries on|off +# If set, ICP queries are logged to access.log. You may wish +# do disable this if your ICP load is VERY high to speed things +# up or to simplify log analysis. +#Default: +# log_icp_queries on + +# TAG: udp_incoming_address +# udp_incoming_address is used for UDP packets received from other +# caches. +# +# The default behavior is to not bind to any specific address. # +# Only change this if you want to have all UDP queries received on +# a specific interface/address. +# +# NOTE: udp_incoming_address is used by the ICP, HTCP, and DNS +# modules. Altering it will affect all of them in the same manner. +# +# see also; udp_outgoing_address +# +# NOTE, udp_incoming_address and udp_outgoing_address can not +# have the same value since they both use the same port. #Default: -# client_db on +# udp_incoming_address any_addr + +# TAG: udp_outgoing_address +# udp_outgoing_address is used for UDP packets sent out to other +# caches. +# +# The default behavior is to not bind to any specific address. +# +# Instead it will use the same socket as udp_incoming_address. +# Only change this if you want to have UDP queries sent using another +# address than where this Squid listens for UDP queries from other +# caches. +# +# NOTE: udp_outgoing_address is used by the ICP, HTCP, and DNS +# modules. Altering it will affect all of them in the same manner. +# +# see also; udp_incoming_address +# +# NOTE, udp_incoming_address and udp_outgoing_address can not +# have the same value since they both use the same port. +#Default: +# udp_outgoing_address no_addr + +# TAG: icp_hit_stale on|off +# If you want to return ICP_HIT for stale cache objects, set this +# option to 'on'. If you have sibling relationships with caches +# in other administrative domains, this should be 'off'. If you only +# have sibling relationships with caches under your control, +# it is probably okay to set this to 'on'. +# If set to 'on', your siblings should use the option "allow-miss" +# on their cache_peer lines for connecting to you. +#Default: +# icp_hit_stale off + +# TAG: minimum_direct_hops +# If using the ICMP pinging stuff, do direct fetches for sites +# which are no more than this many hops away. +#Default: +# minimum_direct_hops 4 + +# TAG: minimum_direct_rtt +# If using the ICMP pinging stuff, do direct fetches for sites +# which are no more than this many rtt milliseconds away. +#Default: +# minimum_direct_rtt 400 # TAG: netdb_low +#Default: +# netdb_low 900 + # TAG: netdb_high # The low and high water marks for the ICMP measurement # database. These are counts, not percents. The defaults are # 900 and 1000. When the high water mark is reached, database # entries will be deleted until the low mark is reached. -# #Default: -# netdb_low 900 # netdb_high 1000 # TAG: netdb_ping_period # The minimum period for measuring a site. There will be at # least this much delay between successive pings to the same # network. The default is five minutes. -# #Default: # netdb_ping_period 5 minutes @@ -1957,14 +5088,13 @@ icp_access allow all # replies, enable this option. # # If your peer has configured Squid (during compilation) with -# '--enable-icmp' then that peer will send ICMP pings to origin server -# sites of the URLs it receives. If you enable this option then the +# '--enable-icmp' that peer will send ICMP pings to origin server +# sites of the URLs it receives. If you enable this option the # ICP replies from that peer will include the ICMP data (if available). # Then, when choosing a parent cache, Squid will choose the parent with # the minimal RTT to the origin server. When this happens, the # hierarchy field of the access.log will be # "CLOSEST_PARENT_MISS". This option is off by default. -# #Default: # query_icmp off @@ -1972,41 +5102,332 @@ icp_access allow all # When this is 'on', ICP MISS replies will be ICP_MISS_NOFETCH # instead of ICP_MISS if the target host is NOT in the ICMP # database, or has a zero RTT. -# #Default: # test_reachability off -# TAG: buffered_logs on|off -# Some log files (cache.log, useragent.log) are written with -# stdio functions, and as such they can be buffered or -# unbuffered. By default they will be unbuffered. Buffering them -# can speed up the writing slightly (though you are unlikely to -# need to worry). +# TAG: icp_query_timeout (msec) +# Normally Squid will automatically determine an optimal ICP +# query timeout value based on the round-trip-time of recent ICP +# queries. If you want to override the value determined by +# Squid, set this 'icp_query_timeout' to a non-zero value. This +# value is specified in MILLISECONDS, so, to use a 2-second +# timeout (the old default), you would write: # +# icp_query_timeout 2000 #Default: -# buffered_logs off +# icp_query_timeout 0 -# TAG: reload_into_ims on|off -# When you enable this option, client no-cache or ``reload'' -# requests will be changed to If-Modified-Since requests. -# Doing this VIOLATES the HTTP standard. Enabling this -# feature could make you liable for problems which it -# causes. -# -# see also refresh_pattern for a more selective approach. +# TAG: maximum_icp_query_timeout (msec) +# Normally the ICP query timeout is determined dynamically. But +# sometimes it can lead to very large values (say 5 seconds). +# Use this option to put an upper limit on the dynamic timeout +# value. Do NOT use this option to always use a fixed (instead +# of a dynamic) timeout value. To set a fixed timeout see the +# 'icp_query_timeout' directive. +#Default: +# maximum_icp_query_timeout 2000 + +# TAG: minimum_icp_query_timeout (msec) +# Normally the ICP query timeout is determined dynamically. But +# sometimes it can lead to very small timeouts, even lower than +# the normal latency variance on your link due to traffic. +# Use this option to put an lower limit on the dynamic timeout +# value. Do NOT use this option to always use a fixed (instead +# of a dynamic) timeout value. To set a fixed timeout see the +# 'icp_query_timeout' directive. +#Default: +# minimum_icp_query_timeout 5 + +# TAG: background_ping_rate time-units +# Controls how often the ICP pings are sent to siblings that +# have background-ping set. +#Default: +# background_ping_rate 10 seconds + +# MULTICAST ICP OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: mcast_groups +# This tag specifies a list of multicast groups which your server +# should join to receive multicasted ICP queries. # -# This option may be disabled by using --disable-http-violations -# with the configure script. +# NOTE! Be very careful what you put here! Be sure you +# understand the difference between an ICP _query_ and an ICP +# _reply_. This option is to be set only if you want to RECEIVE +# multicast queries. Do NOT set this option to SEND multicast +# ICP (use cache_peer for that). ICP replies are always sent via +# unicast, so this option does not affect whether or not you will +# receive replies from multicast group members. +# +# You must be very careful to NOT use a multicast address which +# is already in use by another group of caches. +# +# If you are unsure about multicast, please read the Multicast +# chapter in the Squid FAQ (http://www.squid-cache.org/FAQ/). # +# Usage: mcast_groups 239.128.16.128 224.0.1.20 +# +# By default, Squid doesn't listen on any multicast groups. #Default: -# reload_into_ims off +# none + +# TAG: mcast_miss_addr +# Note: This option is only available if Squid is rebuilt with the +# -DMULTICAST_MISS_STREAM define +# +# If you enable this option, every "cache miss" URL will +# be sent out on the specified multicast address. +# +# Do not enable this option unless you are are absolutely +# certain you understand what you are doing. +#Default: +# mcast_miss_addr no_addr + +# TAG: mcast_miss_ttl +# Note: This option is only available if Squid is rebuilt with the +# -DMULTICAST_MISS_STREAM define +# +# This is the time-to-live value for packets multicasted +# when multicasting off cache miss URLs is enabled. By +# default this is set to 'site scope', i.e. 16. +#Default: +# mcast_miss_ttl 16 + +# TAG: mcast_miss_port +# Note: This option is only available if Squid is rebuilt with the +# -DMULTICAST_MISS_STREAM define +# +# This is the port number to be used in conjunction with +# 'mcast_miss_addr'. +#Default: +# mcast_miss_port 3135 + +# TAG: mcast_miss_encode_key +# Note: This option is only available if Squid is rebuilt with the +# -DMULTICAST_MISS_STREAM define +# +# The URLs that are sent in the multicast miss stream are +# encrypted. This is the encryption key. +#Default: +# mcast_miss_encode_key XXXXXXXXXXXXXXXX + +# TAG: mcast_icp_query_timeout (msec) +# For multicast peers, Squid regularly sends out ICP "probes" to +# count how many other peers are listening on the given multicast +# address. This value specifies how long Squid should wait to +# count all the replies. The default is 2000 msec, or 2 +# seconds. +#Default: +# mcast_icp_query_timeout 2000 + +# INTERNAL ICON OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: icon_directory +# Where the icons are stored. These are normally kept in +# /usr/share/squid/icons +#Default: +# icon_directory /usr/share/squid/icons + +# TAG: global_internal_static +# This directive controls is Squid should intercept all requests for +# /squid-internal-static/ no matter which host the URL is requesting +# (default on setting), or if nothing special should be done for +# such URLs (off setting). The purpose of this directive is to make +# icons etc work better in complex cache hierarchies where it may +# not always be possible for all corners in the cache mesh to reach +# the server generating a directory listing. +#Default: +# global_internal_static on + +# TAG: short_icon_urls +# If this is enabled Squid will use short URLs for icons. +# If disabled it will revert to the old behavior of including +# it's own name and port in the URL. +# +# If you run a complex cache hierarchy with a mix of Squid and +# other proxies you may need to disable this directive. +#Default: +# short_icon_urls on + +# ERROR PAGE OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: error_directory +# If you wish to create your own versions of the default +# error files to customize them to suit your company copy +# /usr/share/squid/errors contains sets of error files +# in different languages. The default error directory +# is /etc/squid/errors, which is a link to one of these +# error sets. +# +# WARNING: This option will disable multi-language support +# on error pages if used. +# +# The squid developers are interested in making squid available in +# a wide variety of languages. If you are making translations for a +# language that Squid does not currently provide please consider +# contributing your translation back to the project. +# http://wiki.squid-cache.org/Translations +# +# The squid developers working on translations are happy to supply drop-in +# translated error files in exchange for any new language contributions. +#Default: +# none + +# TAG: error_default_language +# Set the default language which squid will send error pages in +# if no existing translation matches the clients language +# preferences. +# +# If unset (default) generic English will be used. +# +# The squid developers are interested in making squid available in +# a wide variety of languages. If you are interested in making +# translations for any language see the squid wiki for details. +# http://wiki.squid-cache.org/Translations +#Default: +# none + +# TAG: error_log_languages +# Log to cache.log what languages users are attempting to +# auto-negotiate for translations. +# +# Successful negotiations are not logged. Only failures +# have meaning to indicate that Squid may need an upgrade +# of its error page translations. +#Default: +# error_log_languages on + +# TAG: err_page_stylesheet +# CSS Stylesheet to pattern the display of Squid default error pages. +# +# For information on CSS see http://www.w3.org/Style/CSS/ +#Default: +# err_page_stylesheet /etc/squid/errorpage.css + +# TAG: err_html_text +# HTML text to include in error messages. Make this a "mailto" +# URL to your admin address, or maybe just a link to your +# organizations Web page. +# +# To include this in your error messages, you must rewrite +# the error template files (found in the "errors" directory). +# Wherever you want the 'err_html_text' line to appear, +# insert a %L tag in the error template file. +#Default: +# none + +# TAG: email_err_data on|off +# If enabled, information about the occurred error will be +# included in the mailto links of the ERR pages (if %W is set) +# so that the email body contains the data. +# Syntax is <A HREF="mailto:%w%W">%w</A> +#Default: +# email_err_data on + +# TAG: deny_info +# Usage: deny_info err_page_name acl +# or deny_info http://... acl +# or deny_info TCP_RESET acl +# +# This can be used to return a ERR_ page for requests which +# do not pass the 'http_access' rules. Squid remembers the last +# acl it evaluated in http_access, and if a 'deny_info' line exists +# for that ACL Squid returns a corresponding error page. +# +# The acl is typically the last acl on the http_access deny line which +# denied access. The exceptions to this rule are: +# - When Squid needs to request authentication credentials. It's then +# the first authentication related acl encountered +# - When none of the http_access lines matches. It's then the last +# acl processed on the last http_access line. +# - When the decision to deny access was made by an adaptation service, +# the acl name is the corresponding eCAP or ICAP service_name. +# +# NP: If providing your own custom error pages with error_directory +# you may also specify them by your custom file name: +# Example: deny_info ERR_CUSTOM_ACCESS_DENIED bad_guys +# +# By defaut Squid will send "403 Forbidden". A different 4xx or 5xx +# may be specified by prefixing the file name with the code and a colon. +# e.g. 404:ERR_CUSTOM_ACCESS_DENIED +# +# Alternatively you can tell Squid to reset the TCP connection +# by specifying TCP_RESET. +# +# Or you can specify an error URL or URL pattern. The browsers will +# get redirected to the specified URL after formatting tags have +# been replaced. Redirect will be done with 302 or 307 according to +# HTTP/1.1 specs. A different 3xx code may be specified by prefixing +# the URL. e.g. 303:http://example.com/ +# +# URL FORMAT TAGS: +# %a - username (if available. Password NOT included) +# %B - FTP path URL +# %e - Error number +# %E - Error description +# %h - Squid hostname +# %H - Request domain name +# %i - Client IP Address +# %M - Request Method +# %o - Message result from external ACL helper +# %p - Request Port number +# %P - Request Protocol name +# %R - Request URL path +# %T - Timestamp in RFC 1123 format +# %U - Full canonical URL from client +# (HTTPS URLs terminate with *) +# %u - Full canonical URL from client +# %w - Admin email from squid.conf +# %x - Error name +# %% - Literal percent (%) code +# +#Default: +# none + +# OPTIONS INFLUENCING REQUEST FORWARDING +# ----------------------------------------------------------------------------- + +# TAG: nonhierarchical_direct +# By default, Squid will send any non-hierarchical requests +# (matching hierarchy_stoplist or not cacheable request type) direct +# to origin servers. +# +# If you set this to off, Squid will prefer to send these +# requests to parents. +# +# Note that in most configurations, by turning this off you will only +# add latency to these request without any improvement in global hit +# ratio. +# +# If you are inside an firewall see never_direct instead of +# this directive. +#Default: +# nonhierarchical_direct on + +# TAG: prefer_direct +# Normally Squid tries to use parents for most requests. If you for some +# reason like it to first try going direct and only use a parent if +# going direct fails set this to on. +# +# By combining nonhierarchical_direct off and prefer_direct on you +# can set up Squid to use a parent as a backup path if going direct +# fails. +# +# Note: If you want Squid to use parents for all requests see +# the never_direct directive. prefer_direct only modifies how Squid +# acts on cacheable requests. +#Default: +# prefer_direct off # TAG: always_direct # Usage: always_direct allow|deny [!]aclname ... # # Here you can use ACL elements to specify requests which should -# ALWAYS be forwarded directly to origin servers. For example, -# to always directly forward requests for local servers use +# ALWAYS be forwarded by Squid to the origin servers without using +# any peers. For example, to always directly forward requests for +# local servers ignoring any parents or siblings you may have use # something like: # # acl local-servers dstdomain my.domain.net @@ -2024,13 +5445,21 @@ icp_access allow all # some other rule. Example: # # acl local-external dstdomain external.foo.net -# acl local-servers dstdomain foo.net +# acl local-servers dstdomain .foo.net # always_direct deny local-external # always_direct allow local-servers # -# This option replaces some v1.1 options such as local_domain -# and local_ip. +# NOTE: If your goal is to make the client forward the request +# directly to the origin server bypassing Squid then this needs +# to be done in the client configuration. Squid configuration +# can only tell Squid how Squid should fetch the object. # +# NOTE: This directive is not related to caching. The replies +# is cached as usual even if you use always_direct. To not cache +# the replies see the 'cache' directive. +# +# This clause supports both fast and slow acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. #Default: # none @@ -2045,661 +5474,1112 @@ icp_access allow all # servers. For example, to force the use of a proxy for all # requests, except those in your local domain use something like: # -# acl local-servers dstdomain foo.net -# acl all src 0.0.0.0/0.0.0.0 +# acl local-servers dstdomain .foo.net # never_direct deny local-servers # never_direct allow all -# -# or if squid is inside a firewall and there is local intranet -# servers inside the firewall then use something like: # -# acl local-intranet dstdomain foo.net +# or if Squid is inside a firewall and there are local intranet +# servers inside the firewall use something like: +# +# acl local-intranet dstdomain .foo.net # acl local-external dstdomain external.foo.net # always_direct deny local-external # always_direct allow local-intranet # never_direct allow all -# -# This option replaces some v1.1 options such as inside_firewall -# and firewall_ip. # +# This clause supports both fast and slow acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. #Default: # none -# TAG: anonymize_headers -# Usage: anonymize_headers allow|deny header_name ... +# ADVANCED NETWORKING OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: incoming_udp_average +# Heavy voodoo here. I can't even believe you are reading this. +# Are you crazy? Don't even think about adjusting these unless +# you understand the algorithms in comm_select.c first! +#Default: +# incoming_udp_average 6 + +# TAG: incoming_tcp_average +# Heavy voodoo here. I can't even believe you are reading this. +# Are you crazy? Don't even think about adjusting these unless +# you understand the algorithms in comm_select.c first! +#Default: +# incoming_tcp_average 4 + +# TAG: incoming_dns_average +# Heavy voodoo here. I can't even believe you are reading this. +# Are you crazy? Don't even think about adjusting these unless +# you understand the algorithms in comm_select.c first! +#Default: +# incoming_dns_average 4 + +# TAG: min_udp_poll_cnt +# Heavy voodoo here. I can't even believe you are reading this. +# Are you crazy? Don't even think about adjusting these unless +# you understand the algorithms in comm_select.c first! +#Default: +# min_udp_poll_cnt 8 + +# TAG: min_dns_poll_cnt +# Heavy voodoo here. I can't even believe you are reading this. +# Are you crazy? Don't even think about adjusting these unless +# you understand the algorithms in comm_select.c first! +#Default: +# min_dns_poll_cnt 8 + +# TAG: min_tcp_poll_cnt +# Heavy voodoo here. I can't even believe you are reading this. +# Are you crazy? Don't even think about adjusting these unless +# you understand the algorithms in comm_select.c first! +#Default: +# min_tcp_poll_cnt 8 + +# TAG: accept_filter +# FreeBSD: # -# This option replaces the old 'http_anonymizer' option with -# something that is much more configurable. You may now -# specify exactly which headers are to be allowed, or which -# are to be removed from outgoing requests. +# The name of an accept(2) filter to install on Squid's +# listen socket(s). This feature is perhaps specific to +# FreeBSD and requires support in the kernel. # -# There are two methods of using this option. You may either -# allow specific headers (thus denying all others), or you -# may deny specific headers (thus allowing all others). +# The 'httpready' filter delays delivering new connections +# to Squid until a full HTTP request has been received. +# See the accf_http(9) man page for details. # -# For example, to achieve the same behavior as the old -# 'http_anonymizer standard' option, you should use: +# The 'dataready' filter delays delivering new connections +# to Squid until there is some data to process. +# See the accf_dataready(9) man page for details. # -# anonymize_headers deny From Referer Server -# anonymize_headers deny User-Agent WWW-Authenticate Link -# -# Or, to reproduce the old 'http_anonymizer paranoid' feature -# you should use: +# Linux: +# +# The 'data' filter delays delivering of new connections +# to Squid until there is some data to process by TCP_ACCEPT_DEFER. +# You may optionally specify a number of seconds to wait by +# 'data=N' where N is the number of seconds. Defaults to 30 +# if not specified. See the tcp(7) man page for details. +#EXAMPLE: +## FreeBSD +#accept_filter httpready +## Linux +#accept_filter data +#Default: +# none + +# TAG: client_ip_max_connections +# Set an absolute limit on the number of connections a single +# client IP can use. Any more than this and Squid will begin to drop +# new connections from the client until it closes some links. # -# anonymize_headers allow Allow Authorization Cache-Control -# anonymize_headers allow Content-Encoding Content-Length -# anonymize_headers allow Content-Type Date Expires Host -# anonymize_headers allow If-Modified-Since Last-Modified -# anonymize_headers allow Location Pragma Accept -# anonymize_headers allow Accept-Encoding Accept-Language -# anonymize_headers allow Content-Language Mime-Version -# anonymize_headers allow Retry-After Title Connection -# anonymize_headers allow Proxy-Connection +# Note that this is a global limit. It affects all HTTP, HTCP, Gopher and FTP +# connections from the client. For finer control use the ACL access controls. # -# NOTE: You can not mix "allow" and "deny". All 'anonymize_headers' -# lines must have the same second argument. +# Requires client_db to be enabled (the default). # -# By default, all headers are allowed (no anonymizing is -# performed). +# WARNING: This may noticably slow down traffic received via external proxies +# or NAT devices and cause them to rebound error messages back to their clients. +#Default: +# client_ip_max_connections -1 + +# TAG: tcp_recv_bufsize (bytes) +# Size of receive buffer to set for TCP sockets. Probably just +# as easy to change your kernel's default. Set to zero to use +# the default buffer size. +#Default: +# tcp_recv_bufsize 0 bytes + +# ICAP OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: icap_enable on|off +# If you want to enable the ICAP module support, set this to on. +#Default: +# icap_enable off + +# TAG: icap_connect_timeout +# This parameter specifies how long to wait for the TCP connect to +# the requested ICAP server to complete before giving up and either +# terminating the HTTP transaction or bypassing the failure. # +# The default for optional services is peer_connect_timeout. +# The default for essential services is connect_timeout. +# If this option is explicitly set, its value applies to all services. #Default: # none -# TAG: fake_user_agent -# If you filter the User-Agent header with 'anonymize_headers' it -# may cause some Web servers to refuse your request. Use this to -# fake one up. For example: -# -# fake_user_agent Nutscrape/1.0 (CP/M; 8-bit) -# (credit to Paul Southworth pauls@etext.org for this one!) +# TAG: icap_io_timeout time-units +# This parameter specifies how long to wait for an I/O activity on +# an established, active ICAP connection before giving up and +# either terminating the HTTP transaction or bypassing the +# failure. # +# The default is read_timeout. #Default: # none -# TAG: icon_directory -# Where the icons are stored. These are normally kept in -# /usr/lib/squid/icons +# TAG: icap_service_failure_limit limit [in memory-depth time-units] +# The limit specifies the number of failures that Squid tolerates +# when establishing a new TCP connection with an ICAP service. If +# the number of failures exceeds the limit, the ICAP service is +# not used for new ICAP requests until it is time to refresh its +# OPTIONS. +# +# A negative value disables the limit. Without the limit, an ICAP +# service will not be considered down due to connectivity failures +# between ICAP OPTIONS requests. +# +# Squid forgets ICAP service failures older than the specified +# value of memory-depth. The memory fading algorithm +# is approximate because Squid does not remember individual +# errors but groups them instead, splitting the option +# value into ten time slots of equal length. +# +# When memory-depth is 0 and by default this option has no +# effect on service failure expiration. +# +# Squid always forgets failures when updating service settings +# using an ICAP OPTIONS transaction, regardless of this option +# setting. # +# For example, +# # suspend service usage after 10 failures in 5 seconds: +# icap_service_failure_limit 10 in 5 seconds #Default: -# icon_directory /usr/lib/squid/icons +# icap_service_failure_limit 10 -# TAG: error_directory -# Directory where the error files are read from. -# /usr/lib/squid/errors contains sets of error files -# in different languages. The default error directory -# is /etc/squid/errors, which is a link to one of these -# error sets. -# -# If you wish to create your own versions of the error files, -# either to customize them to suit your language or company, -# copy the template English files to another -# directory and point this tag at them. -# -#error_directory /etc/squid/errors +# TAG: icap_service_revival_delay +# The delay specifies the number of seconds to wait after an ICAP +# OPTIONS request failure before requesting the options again. The +# failed ICAP service is considered "down" until fresh OPTIONS are +# fetched. # +# The actual delay cannot be smaller than the hardcoded minimum +# delay of 30 seconds. #Default: -# error_directory /etc/squid/errors +# icap_service_revival_delay 180 -# TAG: minimum_retry_timeout (seconds) -# This specifies the minimum connect timeout, for when the -# connect timeout is reduced to compensate for the availability -# of multiple IP addresses. +# TAG: icap_preview_enable on|off +# The ICAP Preview feature allows the ICAP server to handle the +# HTTP message by looking only at the beginning of the message body +# or even without receiving the body at all. In some environments, +# previews greatly speedup ICAP processing. # -# When a connection to a host is initiated, and that host has -# several IP addresses, the default connection timeout is reduced -# by dividing it by the number of addresses. So, a site with 15 -# addresses would then have a timeout of 8 seconds for each -# address attempted. To avoid having the timeout reduced to the -# point where even a working host would not have a chance to -# respond, this setting is provided. The default, and the -# minimum value, is five seconds, and the maximum value is sixty -# seconds, or half of connect_timeout, whichever is greater and -# less than connect_timeout. +# During an ICAP OPTIONS transaction, the server may tell Squid what +# HTTP messages should be previewed and how big the preview should be. +# Squid will not use Preview if the server did not request one. # +# To disable ICAP Preview for all ICAP services, regardless of +# individual ICAP server OPTIONS responses, set this option to "off". +#Example: +#icap_preview_enable off #Default: -# minimum_retry_timeout 5 seconds +# icap_preview_enable on -# TAG: maximum_single_addr_tries -# This sets the maximum number of connection attempts for a -# host that only has one address (for multiple-address hosts, -# each address is tried once). +# TAG: icap_preview_size +# The default size of preview data to be sent to the ICAP server. +# -1 means no preview. This value might be overwritten on a per server +# basis by OPTIONS requests. +#Default: +# icap_preview_size -1 + +# TAG: icap_206_enable on|off +# 206 (Partial Content) responses is an ICAP extension that allows the +# ICAP agents to optionally combine adapted and original HTTP message +# content. The decision to combine is postponed until the end of the +# ICAP response. Squid supports Partial Content extension by default. # -# The default value is three tries, the (not recommended) -# maximum is 255 tries. A warning message will be generated -# if it is set to a value greater than ten. +# Activation of the Partial Content extension is negotiated with each +# ICAP service during OPTIONS exchange. Most ICAP servers should handle +# negotation correctly even if they do not support the extension, but +# some might fail. To disable Partial Content support for all ICAP +# services and to avoid any negotiation, set this option to "off". # +# Example: +# icap_206_enable off #Default: -# maximum_single_addr_tries 3 +# icap_206_enable on -# TAG: snmp_port -# Squid can now serve statistics and status information via SNMP. -# By default it listens to port 3401 on the machine. If you don't -# wish to use SNMP, set this to "0". +# TAG: icap_default_options_ttl +# The default TTL value for ICAP OPTIONS responses that don't have +# an Options-TTL header. +#Default: +# icap_default_options_ttl 60 + +# TAG: icap_persistent_connections on|off +# Whether or not Squid should use persistent connections to +# an ICAP server. +#Default: +# icap_persistent_connections on + +# TAG: adaptation_send_client_ip on|off +# If enabled, Squid shares HTTP client IP information with adaptation +# services. For ICAP, Squid adds the X-Client-IP header to ICAP requests. +# For eCAP, Squid sets the libecap::metaClientIp transaction option. # -# NOTE: SNMP support requires use the --enable-snmp configure -# command line option. +# See also: adaptation_uses_indirect_client +#Default: +# adaptation_send_client_ip off + +# TAG: adaptation_send_username on|off +# This sends authenticated HTTP client username (if available) to +# the adaptation service. # +# For ICAP, the username value is encoded based on the +# icap_client_username_encode option and is sent using the header +# specified by the icap_client_username_header option. #Default: -# snmp_port 3401 +# adaptation_send_username off -# TAG: snmp_access -# Allowing or denying access to the SNMP port. +# TAG: icap_client_username_header +# ICAP request header name to use for send_username. +#Default: +# icap_client_username_header X-Client-Username + +# TAG: icap_client_username_encode on|off +# Whether to base64 encode the authenticated client username. +#Default: +# icap_client_username_encode off + +# TAG: icap_service +# Defines a single ICAP service using the following format: # -# All access to the agent is denied by default. -# usage: +# icap_service id vectoring_point uri [option ...] # -# snmp_access allow|deny [!]aclname ... +# id: ID +# an opaque identifier or name which is used to direct traffic to +# this specific service. Must be unique among all adaptation +# services in squid.conf. # -#Example: -# snmp_access allow snmppublic localhost -# snmp_access deny all +# vectoring_point: reqmod_precache|reqmod_postcache|respmod_precache|respmod_postcache +# This specifies at which point of transaction processing the +# ICAP service should be activated. *_postcache vectoring points +# are not yet supported. # -#Default: -# snmp_access deny all - -# TAG: snmp_incoming_address -# TAG: snmp_outgoing_address -# Just like 'udp_incoming_address' above, but for the SNMP port. +# uri: icap://servername:port/servicepath +# ICAP server and service location. # -# snmp_incoming_address is used for the SNMP socket receiving -# messages from SNMP agents. -# snmp_outgoing_address is used for SNMP packets returned to SNMP -# agents. +# ICAP does not allow a single service to handle both REQMOD and RESPMOD +# transactions. Squid does not enforce that requirement. You can specify +# services with the same service_url and different vectoring_points. You +# can even specify multiple identical services as long as their +# service_names differ. # -# The default snmp_incoming_address (0.0.0.0) is to listen on all -# available network interfaces. # -# If snmp_outgoing_address is set to 255.255.255.255 (the default) -# then it will use the same socket as snmp_incoming_address. Only -# change this if you want to have SNMP replies sent using another -# address than where this Squid listens for SNMP queries. +# Service options are separated by white space. ICAP services support +# the following name=value options: # -# NOTE, snmp_incoming_address and snmp_outgoing_address can not have -# the same value since they both use port 3401. +# bypass=on|off|1|0 +# If set to 'on' or '1', the ICAP service is treated as +# optional. If the service cannot be reached or malfunctions, +# Squid will try to ignore any errors and process the message as +# if the service was not enabled. No all ICAP errors can be +# bypassed. If set to 0, the ICAP service is treated as +# essential and all ICAP errors will result in an error page +# returned to the HTTP client. +# +# Bypass is off by default: services are treated as essential. +# +# routing=on|off|1|0 +# If set to 'on' or '1', the ICAP service is allowed to +# dynamically change the current message adaptation plan by +# returning a chain of services to be used next. The services +# are specified using the X-Next-Services ICAP response header +# value, formatted as a comma-separated list of service names. +# Each named service should be configured in squid.conf. Other +# services are ignored. An empty X-Next-Services value results +# in an empty plan which ends the current adaptation. +# +# Dynamic adaptation plan may cross or cover multiple supported +# vectoring points in their natural processing order. # +# Routing is not allowed by default: the ICAP X-Next-Services +# response header is ignored. +# +# ipv6=on|off +# Only has effect on split-stack systems. The default on those systems +# is to use IPv4-only connections. When set to 'on' this option will +# make Squid use IPv6-only connections to contact this ICAP service. +# +# on-overload=block|bypass|wait|force +# If the service Max-Connections limit has been reached, do +# one of the following for each new ICAP transaction: +# * block: send an HTTP error response to the client +# * bypass: ignore the "over-connected" ICAP service +# * wait: wait (in a FIFO queue) for an ICAP connection slot +# * force: proceed, ignoring the Max-Connections limit +# +# In SMP mode with N workers, each worker assumes the service +# connection limit is Max-Connections/N, even though not all +# workers may use a given service. +# +# The default value is "bypass" if service is bypassable, +# otherwise it is set to "wait". +# +# +# max-conn=number +# Use the given number as the Max-Connections limit, regardless +# of the Max-Connections value given by the service, if any. +# +# Older icap_service format without optional named parameters is +# deprecated but supported for backward compatibility. +# +#Example: +#icap_service svcBlocker reqmod_precache icap://icap1.mydomain.net:1344/reqmod bypass=0 +#icap_service svcLogger reqmod_precache icap://icap2.mydomain.net:1344/respmod routing=on #Default: -# snmp_incoming_address 0.0.0.0 -# snmp_outgoing_address 255.255.255.255 +# none -# TAG: as_whois_server -# WHOIS server to query for AS numbers. NOTE: AS numbers are -# queried only when Squid starts up, not for every request. +# TAG: icap_class +# This deprecated option was documented to define an ICAP service +# chain, even though it actually defined a set of similar, redundant +# services, and the chains were not supported. # +# To define a set of redundant services, please use the +# adaptation_service_set directive. For service chains, use +# adaptation_service_chain. #Default: -# as_whois_server whois.ra.net -# as_whois_server whois.ra.net +# none -# TAG: wccp_router -# Use this option to define your WCCP ``home'' router for -# Squid. Setting the 'wccp_router' to 0.0.0.0 (the default) -# disables WCCP. -# +# TAG: icap_access +# This option is deprecated. Please use adaptation_access, which +# has the same ICAP functionality, but comes with better +# documentation, and eCAP support. #Default: -# wccp_router 0.0.0.0 +# none -# TAG: wccp_version -# According to some users, Cisco IOS 11.2 only supports WCCP -# version 3. If you're using that version of IOS, change -# this value to 3. -# +# eCAP OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: ecap_enable on|off +# Controls whether eCAP support is enabled. #Default: -# wccp_version 4 +# ecap_enable off -# TAG: wccp_incoming_address -# TAG: wccp_outgoing_address -# wccp_incoming_address Use this option if you require WCCP -# messages to be received on only one -# interface. Do NOT use this option if -# you're unsure how many interfaces you -# have, or if you know you have only one -# interface. +# TAG: ecap_service +# Defines a single eCAP service # -# wccp_outgoing_address Use this option if you require WCCP -# messages to be sent out on only one -# interface. Do NOT use this option if -# you're unsure how many interfaces you -# have, or if you know you have only one -# interface. +# ecap_service id vectoring_point uri [option ...] # -# The default behavior is to not bind to any specific address. +# id: ID +# an opaque identifier or name which is used to direct traffic to +# this specific service. Must be unique among all adaptation +# services in squid.conf. # -# NOTE, wccp_incoming_address and wccp_outgoing_address can not have -# the same value since they both use port 2048. +# vectoring_point: reqmod_precache|reqmod_postcache|respmod_precache|respmod_postcache +# This specifies at which point of transaction processing the +# eCAP service should be activated. *_postcache vectoring points +# are not yet supported. # -#Default: -# wccp_incoming_address 0.0.0.0 -# wccp_outgoing_address 255.255.255.255 - - -# DELAY POOL PARAMETERS (all require DELAY_POOLS compilation option) -# ----------------------------------------------------------------------------- - -# TAG: delay_pools -# This represents the number of delay pools to be used. For example, -# if you have one class 2 delay pool and one class 3 delays pool, you -# have a total of 2 delay pools. +# uri: ecap://vendor/service_name?custom&cgi=style¶meters=optional +# Squid uses the eCAP service URI to match this configuration +# line with one of the dynamically loaded services. Each loaded +# eCAP service must have a unique URI. Obtain the right URI from +# the service provider. # -# To enable this option, you must use --enable-delay-pools with the -# configure script. # -#Default: -# delay_pools 0 - -# TAG: delay_class -# This defines the class of each delay pool. There must be exactly one -# delay_class line for each delay pool. For example, to define two -# delay pools, one of class 2 and one of class 3, the settings above -# and here would be: +# Service options are separated by white space. eCAP services support +# the following name=value options: # -#Example: -# delay_pools 2 # 2 delay pools -# delay_class 1 2 # pool 1 is a class 2 pool -# delay_class 2 3 # pool 2 is a class 3 pool +# bypass=on|off|1|0 +# If set to 'on' or '1', the eCAP service is treated as optional. +# If the service cannot be reached or malfunctions, Squid will try +# to ignore any errors and process the message as if the service +# was not enabled. No all eCAP errors can be bypassed. +# If set to 'off' or '0', the eCAP service is treated as essential +# and all eCAP errors will result in an error page returned to the +# HTTP client. # -# The delay pool classes are: +# Bypass is off by default: services are treated as essential. # -# class 1 Everything is limited by a single aggregate -# bucket. +# routing=on|off|1|0 +# If set to 'on' or '1', the eCAP service is allowed to +# dynamically change the current message adaptation plan by +# returning a chain of services to be used next. # -# class 2 Everything is limited by a single aggregate -# bucket as well as an "individual" bucket chosen -# from bits 25 through 32 of the IP address. +# Dynamic adaptation plan may cross or cover multiple supported +# vectoring points in their natural processing order. # -# class 3 Everything is limited by a single aggregate -# bucket as well as a "network" bucket chosen -# from bits 17 through 24 of the IP address and a -# "individual" bucket chosen from bits 17 through -# 32 of the IP address. +# Routing is not allowed by default. +# +# Older ecap_service format without optional named parameters is +# deprecated but supported for backward compatibility. # -# NOTE: If an IP address is a.b.c.d -# -> bits 25 through 32 are "d" -# -> bits 17 through 24 are "c" -# -> bits 17 through 32 are "c * 256 + d" # +#Example: +#ecap_service s1 reqmod_precache ecap://filters.R.us/leakDetector?on_error=block bypass=off +#ecap_service s2 respmod_precache ecap://filters.R.us/virusFilter config=/etc/vf.cfg bypass=on #Default: # none -# TAG: delay_access -# This is used to determine which delay pool a request falls into. -# The first matched delay pool is always used, i.e., if a request falls -# into delay pool number one, no more delay are checked, otherwise the -# rest are checked in order of their delay pool number until they have -# all been checked. For example, if you want some_big_clients in delay -# pool 1 and lotsa_little_clients in delay pool 2: -# +# TAG: loadable_modules +# Instructs Squid to load the specified dynamic module(s) or activate +# preloaded module(s). #Example: -# delay_access 1 allow some_big_clients -# delay_access 1 deny all -# delay_access 2 allow lotsa_little_clients -# delay_access 2 deny all -# +#loadable_modules /usr/lib/MinimalAdapter.so #Default: # none -# TAG: delay_parameters -# This defines the parameters for a delay pool. Each delay pool has -# a number of "buckets" associated with it, as explained in the -# description of delay_class. For a class 1 delay pool, the syntax is: +# MESSAGE ADAPTATION OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: adaptation_service_set # -#delay_parameters pool aggregate +# Configures an ordered set of similar, redundant services. This is +# useful when hot standby or backup adaptation servers are available. # -# For a class 2 delay pool: +# adaptation_service_set set_name service_name1 service_name2 ... # -#delay_parameters pool aggregate individual +# The named services are used in the set declaration order. The first +# applicable adaptation service from the set is used first. The next +# applicable service is tried if and only if the transaction with the +# previous service fails and the message waiting to be adapted is still +# intact. # -# For a class 3 delay pool: +# When adaptation starts, broken services are ignored as if they were +# not a part of the set. A broken service is a down optional service. # -#delay_parameters pool aggregate network individual +# The services in a set must be attached to the same vectoring point +# (e.g., pre-cache) and use the same adaptation method (e.g., REQMOD). # -# The variables here are: +# If all services in a set are optional then adaptation failures are +# bypassable. If all services in the set are essential, then a +# transaction failure with one service may still be retried using +# another service from the set, but when all services fail, the master +# transaction fails as well. # -# pool a pool number - ie, a number between 1 and the -# number specified in delay_pools as used in -# delay_class lines. +# A set may contain a mix of optional and essential services, but that +# is likely to lead to surprising results because broken services become +# ignored (see above), making previously bypassable failures fatal. +# Technically, it is the bypassability of the last failed service that +# matters. # -# aggregate the "delay parameters" for the aggregate bucket -# (class 1, 2, 3). +# See also: adaptation_access adaptation_service_chain # -# individual the "delay parameters" for the individual -# buckets (class 2, 3). +#Example: +#adaptation_service_set svcBlocker urlFilterPrimary urlFilterBackup +#adaptation service_set svcLogger loggerLocal loggerRemote +#Default: +# none + +# TAG: adaptation_service_chain # -# network the "delay parameters" for the network buckets -# (class 3). +# Configures a list of complementary services that will be applied +# one-by-one, forming an adaptation chain or pipeline. This is useful +# when Squid must perform different adaptations on the same message. # -# A pair of delay parameters is written restore/maximum, where restore is -# the number of bytes (not bits - modem and network speeds are usually -# quoted in bits) per second placed into the bucket, and maximum is the -# maximum number of bytes which can be in the bucket at any time. +# adaptation_service_chain chain_name service_name1 svc_name2 ... # -# For example, if delay pool number 1 is a class 2 delay pool as in the -# above example, and is being used to strictly limit each host to 64kbps -# (plus overheads), with no overall limit, the line is: +# The named services are used in the chain declaration order. The first +# applicable adaptation service from the chain is used first. The next +# applicable service is applied to the successful adaptation results of +# the previous service in the chain. # -#delay_parameters 1 -1/-1 8000/8000 +# When adaptation starts, broken services are ignored as if they were +# not a part of the chain. A broken service is a down optional service. # -# Note that the figure -1 is used to represent "unlimited". +# Request satisfaction terminates the adaptation chain because Squid +# does not currently allow declaration of RESPMOD services at the +# "reqmod_precache" vectoring point (see icap_service or ecap_service). # -# And, if delay pool number 2 is a class 3 delay pool as in the above -# example, and you want to limit it to a total of 256kbps (strict limit) -# with each 8-bit network permitted 64kbps (strict limit) and each -# individual host permitted 4800bps with a bucket maximum size of 64kb -# to permit a decent web page to be downloaded at a decent speed -# (if the network is not being limited due to overuse) but slow down -# large downloads more significantly: +# The services in a chain must be attached to the same vectoring point +# (e.g., pre-cache) and use the same adaptation method (e.g., REQMOD). # -#delay_parameters 2 32000/32000 8000/8000 600/64000 +# A chain may contain a mix of optional and essential services. If an +# essential adaptation fails (or the failure cannot be bypassed for +# other reasons), the master transaction fails. Otherwise, the failure +# is bypassed as if the failed adaptation service was not in the chain. # -# There must be one delay_parameters line for each delay pool. +# See also: adaptation_access adaptation_service_set # +#Example: +#adaptation_service_chain svcRequest requestLogger urlFilter leakDetector #Default: # none -# TAG: delay_initial_bucket_level (percent, 0-100) -# The initial bucket percentage is used to determine how much is put -# in each bucket when squid starts, is reconfigured, or first notices -# a host accessing it (in class 2 and class 3, individual hosts and -# networks only have buckets associated with them once they have been -# "seen" by squid). +# TAG: adaptation_access +# Sends an HTTP transaction to an ICAP or eCAP adaptation service. # -#Default: -# delay_initial_bucket_level 50 - -# TAG: incoming_icp_average -# TAG: incoming_http_average -# TAG: incoming_dns_average -# TAG: min_icp_poll_cnt -# TAG: min_dns_poll_cnt -# TAG: min_http_poll_cnt -# Heavy voodoo here. I can't even believe you are reading this. -# Are you crazy? Don't even think about adjusting these unless -# you understand the algorithms in comm_select.c first! +# adaptation_access service_name allow|deny [!]aclname... +# adaptation_access set_name allow|deny [!]aclname... # -#Default: -# incoming_icp_average 6 -# incoming_http_average 4 -# incoming_dns_average 4 -# min_icp_poll_cnt 8 -# min_dns_poll_cnt 8 -# min_http_poll_cnt 8 - -# TAG: max_open_disk_fds -# To avoid having disk as the I/O bottleneck Squid can optionally -# bypass the on-disk cache if more than this amount of disk file -# descriptors are open. +# At each supported vectoring point, the adaptation_access +# statements are processed in the order they appear in this +# configuration file. Statements pointing to the following services +# are ignored (i.e., skipped without checking their ACL): # -# A value of 0 indicates no limit. +# - services serving different vectoring points +# - "broken-but-bypassable" services +# - "up" services configured to ignore such transactions +# (e.g., based on the ICAP Transfer-Ignore header). # -#Default: -# max_open_disk_fds 0 - -# TAG: offline_mode -# Enable this option and Squid will never try to validate cached -# objects. +# When a set_name is used, all services in the set are checked +# using the same rules, to find the first applicable one. See +# adaptation_service_set for details. +# +# If an access list is checked and there is a match, the +# processing stops: For an "allow" rule, the corresponding +# adaptation service is used for the transaction. For a "deny" +# rule, no adaptation service is activated. # +# It is currently not possible to apply more than one adaptation +# service at the same vectoring point to the same HTTP transaction. +# +# See also: icap_service and ecap_service +# +#Example: +#adaptation_access service_1 allow all #Default: -# offline_mode off +# none -# TAG: uri_whitespace -# What to do with requests that have whitespace characters in the -# URI. Options: +# TAG: adaptation_service_iteration_limit +# Limits the number of iterations allowed when applying adaptation +# services to a message. If your longest adaptation set or chain +# may have more than 16 services, increase the limit beyond its +# default value of 16. If detecting infinite iteration loops sooner +# is critical, make the iteration limit match the actual number +# of services in your longest adaptation set or chain. # -# strip: The whitespace characters are stripped out of the URL. -# This is the behavior recommended by RFC2616. -# deny: The request is denied. The user receives an "Invalid -# Request" message. -# allow: The request is allowed and the URI is not changed. The -# whitespace characters remain in the URI. Note the -# whitespace is passed to redirector processes if they -# are in use. -# encode: The request is allowed and the whitespace characters are -# encoded according to RFC1738. This could be considered -# a violation of the HTTP/1.1 -# RFC because proxies are not allowed to rewrite URI's. -# chop: The request is allowed and the URI is chopped at the -# first whitespace. This might also be considered a -# violation. +# Infinite adaptation loops are most likely with routing services. # +# See also: icap_service routing=1 #Default: -# uri_whitespace strip +# adaptation_service_iteration_limit 16 -# TAG: broken_posts -# A list of ACL elements which, if matched, causes Squid to send -# a extra CRLF pair after the body of a PUT/POST request. +# TAG: adaptation_masterx_shared_names +# For each master transaction (i.e., the HTTP request and response +# sequence, including all related ICAP and eCAP exchanges), Squid +# maintains a table of metadata. The table entries are (name, value) +# pairs shared among eCAP and ICAP exchanges. The table is destroyed +# with the master transaction. # -# Some HTTP servers has broken implementations of PUT/POST, -# and rely on a extra CRLF pair sent by some WWW clients. +# This option specifies the table entry names that Squid must accept +# from and forward to the adaptation transactions. # -# Quote from RFC 2068 section 4.1 on this matter: +# An ICAP REQMOD or RESPMOD transaction may set an entry in the +# shared table by returning an ICAP header field with a name +# specified in adaptation_masterx_shared_names. # -# Note: certain buggy HTTP/1.0 client implementations generate an -# extra CRLF's after a POST request. To restate what is explicitly -# forbidden by the BNF, an HTTP/1.1 client must not preface or follow -# a request with an extra CRLF. +# An eCAP REQMOD or RESPMOD transaction may set an entry in the +# shared table by implementing the libecap::visitEachOption() API +# to provide an option with a name specified in +# adaptation_masterx_shared_names. # -#Example: -# acl buggy_server url_regex ^http://.... -# broken_posts allow buggy_server +# Squid will store and forward the set entry to subsequent adaptation +# transactions within the same master transaction scope. +# +# Only one shared entry name is supported at this time. # +#Example: +## share authentication information among ICAP services +#adaptation_masterx_shared_names X-Subscriber-ID #Default: # none -# TAG: mcast_miss_addr -# Note: This option is only available if Squid is rebuilt with the -# -DMULTICAST_MISS_STREAM option +# TAG: adaptation_meta +# This option allows Squid administrator to add custom ICAP request +# headers or eCAP options to Squid ICAP requests or eCAP transactions. +# Use it to pass custom authentication tokens and other +# transaction-state related meta information to an ICAP/eCAP service. +# +# The addition of a meta header is ACL-driven: +# adaptation_meta name value [!]aclname ... +# +# Processing for a given header name stops after the first ACL list match. +# Thus, it is impossible to add two headers with the same name. If no ACL +# lists match for a given header name, no such header is added. For +# example: +# +# # do not debug transactions except for those that need debugging +# adaptation_meta X-Debug 1 needs_debugging +# +# # log all transactions except for those that must remain secret +# adaptation_meta X-Log 1 !keep_secret +# +# # mark transactions from users in the "G 1" group +# adaptation_meta X-Authenticated-Groups "G 1" authed_as_G1 +# +# The "value" parameter may be a regular squid.conf token or a "double +# quoted string". Within the quoted string, use backslash (\) to escape +# any character, which is currently only useful for escaping backslashes +# and double quotes. For example, +# "this string has one backslash (\\) and two \"quotes\"" +#Default: +# none + +# TAG: icap_retry +# This ACL determines which retriable ICAP transactions are +# retried. Transactions that received a complete ICAP response +# and did not have to consume or produce HTTP bodies to receive +# that response are usually retriable. # -# If you enable this option, every "cache miss" URL will -# be sent out on the specified multicast address. +# icap_retry allow|deny [!]aclname ... # -# Do not enable this option unless you are are absolutely -# certain you understand what you are doing. +# Squid automatically retries some ICAP I/O timeouts and errors +# due to persistent connection race conditions. # +# See also: icap_retry_limit #Default: -# mcast_miss_addr 255.255.255.255 +# icap_retry deny all -# TAG: mcast_miss_ttl -# Note: This option is only available if Squid is rebuilt with the -# -DMULTICAST_MISS_TTL option +# TAG: icap_retry_limit +# Limits the number of retries allowed. When set to zero (default), +# no retries are allowed. # -# This is the time-to-live value for packets multicasted -# when multicasting off cache miss URLs is enabled. By -# default this is set to 'site scope', i.e. 16. +# Communication errors due to persistent connection race +# conditions are unavoidable, automatically retried, and do not +# count against this limit. # +# See also: icap_retry #Default: -# mcast_miss_ttl 16 +# icap_retry_limit 0 -# TAG: mcast_miss_port +# DNS OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: check_hostnames +# For security and stability reasons Squid can check +# hostnames for Internet standard RFC compliance. If you want +# Squid to perform these checks turn this directive on. +#Default: +# check_hostnames off + +# TAG: allow_underscore +# Underscore characters is not strictly allowed in Internet hostnames +# but nevertheless used by many sites. Set this to off if you want +# Squid to be strict about the standard. +# This check is performed only when check_hostnames is set to on. +#Default: +# allow_underscore on + +# TAG: cache_dns_program # Note: This option is only available if Squid is rebuilt with the -# -DMULTICAST_MISS_STREAM option -# -# This is the port number to be used in conjunction with -# 'mcast_miss_addr'. +# --disable-internal-dns # +# Specify the location of the executable for dnslookup process. #Default: -# mcast_miss_port 3135 +# cache_dns_program /usr/lib64/squid/dnsserver -# TAG: mcast_miss_encode_key +# TAG: dns_children # Note: This option is only available if Squid is rebuilt with the -# -DMULTICAST_MISS_STREAM option -# -# The URLs that are sent in the multicast miss stream are -# encrypted. This is the encryption key. +# --disable-internal-dns # +# The maximum number of processes spawn to service DNS name lookups. +# If you limit it too few Squid will have to wait for them to process +# a backlog of requests, slowing it down. If you allow too many they +# will use RAM and other system resources noticably. +# The maximum this may be safely set to is 32. +# +# The startup= and idle= options allow some measure of skew in your +# tuning. +# +# startup= +# +# Sets a minimum of how many processes are to be spawned when Squid +# starts or reconfigures. When set to zero the first request will +# cause spawning of the first child process to handle it. +# +# Starting too few will cause an initial slowdown in traffic as Squid +# attempts to simultaneously spawn enough processes to cope. +# +# idle= +# +# Sets a minimum of how many processes Squid is to try and keep available +# at all times. When traffic begins to rise above what the existing +# processes can handle this many more will be spawned up to the maximum +# configured. A minimum setting of 1 is required. #Default: -# mcast_miss_encode_key XXXXXXXXXXXXXXXX +# dns_children 32 startup=1 idle=1 -# TAG: nonhierarchical_direct -# By default, Squid will send any non-hierarchical requests -# (matching hierarchy_stoplist or not cachable request type) direct -# to origin servers. -# -# If you set this to off, then Squid will prefer to send these -# requests to parents. -# -# Note that in most configurations, by turning this off you will only -# add latency to these request without any improvement in global hit -# ratio. -# -# If you are inside an firewall then see never_direct instead of -# this directive. -# +# TAG: dns_retransmit_interval +# Initial retransmit interval for DNS queries. The interval is +# doubled each time all configured DNS servers have been tried. #Default: -# nonhierarchical_direct on +# dns_retransmit_interval 5 seconds -# TAG: prefer_direct -# Normally Squid tries to use parents for most requests. If you by some -# reason like it to first try going direct and only use a parent if -# going direct fails then set this to off. -# -# By combining nonhierarchical_direct off and prefer_direct on you -# can set up Squid to use a parent as a backup path if going direct -# fails. -# +# TAG: dns_timeout +# DNS Query timeout. If no response is received to a DNS query +# within this time all DNS servers for the queried domain +# are assumed to be unavailable. #Default: -# prefer_direct off +# dns_timeout 30 seconds -# TAG: strip_query_terms -# By default, Squid strips query terms from requested URLs before -# logging. This protects your user's privacy. -# +# TAG: dns_packet_max +# Maximum number of bytes packet size to advertise via EDNS. +# Set to "none" to disable EDNS large packet support. +# +# For legacy reasons DNS UDP replies will default to 512 bytes which +# is too small for many responses. EDNS provides a means for Squid to +# negotiate receiving larger responses back immediately without having +# to failover with repeat requests. Responses larger than this limit +# will retain the old behaviour of failover to TCP DNS. +# +# Squid has no real fixed limit internally, but allowing packet sizes +# over 1500 bytes requires network jumbogram support and is usually not +# necessary. +# +# WARNING: The RFC also indicates that some older resolvers will reply +# with failure of the whole request if the extension is added. Some +# resolvers have already been identified which will reply with mangled +# EDNS response on occasion. Usually in response to many-KB jumbogram +# sizes being advertised by Squid. +# Squid will currently treat these both as an unable-to-resolve domain +# even if it would be resolvable without EDNS. #Default: -# strip_query_terms on +# none -# TAG: coredump_dir -# By default Squid leaves core files in the first cache_dir -# directory. If you set 'coredump_dir' to a directory -# that exists, Squid will chdir() to that directory at startup -# and coredump files will be left there. +# TAG: dns_defnames on|off +# Normally the RES_DEFNAMES resolver option is disabled +# (see res_init(3)). This prevents caches in a hierarchy +# from interpreting single-component hostnames locally. To allow +# Squid to handle single-component names, enable this option. +#Default: +# dns_defnames off + +# TAG: dns_nameservers +# Use this if you want to specify a list of DNS name servers +# (IP addresses) to use instead of those given in your +# /etc/resolv.conf file. +# On Windows platforms, if no value is specified here or in +# the /etc/resolv.conf file, the list of DNS name servers are +# taken from the Windows registry, both static and dynamic DHCP +# configurations are supported. # +# Example: dns_nameservers 10.0.0.1 192.172.0.4 #Default: # none -# TAG: redirector_bypass -# When this is 'on', a request will not go through the -# redirector if all redirectors are busy. If this is 'off' -# and the redirector queue grows too large, Squid will exit -# with a FATAL error and ask you to increase the number of -# redirectors. You should only enable this if the redirectors -# are not critical to your caching system. If you use -# redirectors for access control, and you enable this option, -# then users may have access to pages that they should not -# be allowed to request. +# TAG: hosts_file +# Location of the host-local IP name-address associations +# database. Most Operating Systems have such a file on different +# default locations: +# - Un*X & Linux: /etc/hosts +# - Windows NT/2000: %SystemRoot%\system32\drivers\etc\hosts +# (%SystemRoot% value install default is c:\winnt) +# - Windows XP/2003: %SystemRoot%\system32\drivers\etc\hosts +# (%SystemRoot% value install default is c:\windows) +# - Windows 9x/Me: %windir%\hosts +# (%windir% value is usually c:\windows) +# - Cygwin: /etc/hosts +# +# The file contains newline-separated definitions, in the +# form ip_address_in_dotted_form name [name ...] names are +# whitespace-separated. Lines beginning with an hash (#) +# character are comments. +# +# The file is checked at startup and upon configuration. +# If set to 'none', it won't be checked. +# If append_domain is used, that domain will be added to +# domain-local (i.e. not containing any dot character) host +# definitions. +#Default: +# hosts_file /etc/hosts + +# TAG: append_domain +# Appends local domain name to hostnames without any dots in +# them. append_domain must begin with a period. # +# Be warned there are now Internet names with no dots in +# them using only top-domain names, so setting this may +# cause some Internet sites to become unavailable. +# +#Example: +# append_domain .yourdomain.com #Default: -# redirector_bypass off +# none # TAG: ignore_unknown_nameservers # By default Squid checks that DNS responses are received -# from the same IP addresses that they are sent to. If they +# from the same IP addresses they are sent to. If they # don't match, Squid ignores the response and writes a warning # message to cache.log. You can allow responses from unknown # nameservers by setting this option to 'off'. -# #Default: # ignore_unknown_nameservers on -# TAG: digest_generation -# Note: This option is only available if Squid is rebuilt with the -# --enable-cache-digests option +# TAG: dns_v4_first +# With the IPv6 Internet being as fast or faster than IPv4 Internet +# for most networks Squid prefers to contact websites over IPv6. # -# This controls whether the server will generate a Cache Digest -# of its contents. By default, Cache Digest generation is -# enabled if Squid is compiled with USE_CACHE_DIGESTS defined. +# This option reverses the order of preference to make Squid contact +# dual-stack websites over IPv4 first. Squid will still perform both +# IPv6 and IPv4 DNS lookups before connecting. # +# WARNING: +# This option will restrict the situations under which IPv6 +# connectivity is used (and tested). Hiding network problems +# which would otherwise be detected and warned about. #Default: -# digest_generation on +# dns_v4_first off -# TAG: digest_bits_per_entry -# Note: This option is only available if Squid is rebuilt with the -# --enable-cache-digests option +# TAG: ipcache_size (number of entries) +#Default: +# ipcache_size 1024 + +# TAG: ipcache_low (percent) +#Default: +# ipcache_low 90 + +# TAG: ipcache_high (percent) +# The size, low-, and high-water marks for the IP cache. +#Default: +# ipcache_high 95 + +# TAG: fqdncache_size (number of entries) +# Maximum number of FQDN cache entries. +#Default: +# fqdncache_size 1024 + +# MISCELLANEOUS +# ----------------------------------------------------------------------------- + +# TAG: memory_pools on|off +# If set, Squid will keep pools of allocated (but unused) memory +# available for future use. If memory is a premium on your +# system and you believe your malloc library outperforms Squid +# routines, disable this. +#Default: +# memory_pools on + +# TAG: memory_pools_limit (bytes) +# Used only with memory_pools on: +# memory_pools_limit 50 MB # -# This is the number of bits of the server's Cache Digest which -# will be associated with the Digest entry for a given HTTP -# Method and URL (public key) combination. The default is 5. +# If set to a non-zero value, Squid will keep at most the specified +# limit of allocated (but unused) memory in memory pools. All free() +# requests that exceed this limit will be handled by your malloc +# library. Squid does not pre-allocate any memory, just safe-keeps +# objects that otherwise would be free()d. Thus, it is safe to set +# memory_pools_limit to a reasonably high value even if your +# configuration will use less memory. # +# If set to none, Squid will keep all memory it can. That is, there +# will be no limit on the total amount of memory used for safe-keeping. +# +# To disable memory allocation optimization, do not set +# memory_pools_limit to 0 or none. Set memory_pools to "off" instead. +# +# An overhead for maintaining memory pools is not taken into account +# when the limit is checked. This overhead is close to four bytes per +# object kept. However, pools may actually _save_ memory because of +# reduced memory thrashing in your malloc library. #Default: -# digest_bits_per_entry 5 +# memory_pools_limit 5 MB -# TAG: digest_rebuild_period (seconds) -# Note: This option is only available if Squid is rebuilt with the -# --enable-cache-digests option +# TAG: forwarded_for on|off|transparent|truncate|delete +# If set to "on", Squid will append your client's IP address +# in the HTTP requests it forwards. By default it looks like: # -# This is the number of seconds between Cache Digest rebuilds. +# X-Forwarded-For: 192.1.2.3 +# +# If set to "off", it will appear as +# +# X-Forwarded-For: unknown +# +# If set to "transparent", Squid will not alter the +# X-Forwarded-For header in any way. # +# If set to "delete", Squid will delete the entire +# X-Forwarded-For header. +# +# If set to "truncate", Squid will remove all existing +# X-Forwarded-For entries, and place the client IP as the sole entry. #Default: -# digest_rebuild_period 1 hour +# forwarded_for on -# TAG: digest_rewrite_period (seconds) -# Note: This option is only available if Squid is rebuilt with the -# --enable-cache-digests option +# TAG: cachemgr_passwd +# Specify passwords for cachemgr operations. # -# This is the number of seconds between Cache Digest writes to -# disk. +# Usage: cachemgr_passwd password action action ... # +# Some valid actions are (see cache manager menu for a full list): +# 5min +# 60min +# asndb +# authenticator +# cbdata +# client_list +# comm_incoming +# config * +# counters +# delay +# digest_stats +# dns +# events +# filedescriptors +# fqdncache +# histograms +# http_headers +# info +# io +# ipcache +# mem +# menu +# netdb +# non_peers +# objects +# offline_toggle * +# pconn +# peer_select +# reconfigure * +# redirector +# refresh +# server_list +# shutdown * +# store_digest +# storedir +# utilization +# via_headers +# vm_objects +# +# * Indicates actions which will not be performed without a +# valid password, others can be performed if not listed here. +# +# To disable an action, set the password to "disable". +# To allow performing an action without a password, set the +# password to "none". +# +# Use the keyword "all" to set the same password for all actions. +# +#Example: +# cachemgr_passwd secret shutdown +# cachemgr_passwd lesssssssecret info stats/objects +# cachemgr_passwd disable all #Default: -# digest_rewrite_period 1 hour +# none -# TAG: digest_swapout_chunk_size (bytes) -# Note: This option is only available if Squid is rebuilt with the -# --enable-cache-digests option +# TAG: client_db on|off +# If you want to disable collecting per-client statistics, +# turn off client_db here. +#Default: +# client_db on + +# TAG: refresh_all_ims on|off +# When you enable this option, squid will always check +# the origin server for an update when a client sends an +# If-Modified-Since request. Many browsers use IMS +# requests when the user requests a reload, and this +# ensures those clients receive the latest version. # -# This is the number of bytes of the Cache Digest to write to -# disk at a time. It defaults to 4096 bytes (4KB), the Squid -# default swap page. +# By default (off), squid may return a Not Modified response +# based on the age of the cached version. +#Default: +# refresh_all_ims off + +# TAG: reload_into_ims on|off +# When you enable this option, client no-cache or ``reload'' +# requests will be changed to If-Modified-Since requests. +# Doing this VIOLATES the HTTP standard. Enabling this +# feature could make you liable for problems which it +# causes. # +# see also refresh_pattern for a more selective approach. #Default: -# digest_swapout_chunk_size 4096 bytes +# reload_into_ims off -# TAG: digest_rebuild_chunk_percentage (percent, 0-100) -# Note: This option is only available if Squid is rebuilt with the -# --enable-cache-digests option +# TAG: connect_retries +# This sets the maximum number of connection attempts made for each +# TCP connection. The connect_retries attempts must all still +# complete within the connection timeout period. # -# This is the percentage of the Cache Digest to be scanned at a -# time. By default it is set to 10% of the Cache Digest. +# The default is not to re-try if the first connection attempt fails. +# The (not recommended) maximum is 10 tries. +# +# A warning message will be generated if it is set to a too-high +# value and the configured value will be over-ridden. # +# Note: These re-tries are in addition to forward_max_tries +# which limit how many different addresses may be tried to find +# a useful server. #Default: -# digest_rebuild_chunk_percentage 10 +# connect_retries 0 -# TAG: chroot -# Use this to have Squid do a chroot() while initializing. This -# also causes Squid to fully drop root privileges after -# initializing. This means, for example, that if you use a HTTP -# port less than 1024 and try to reconfigure, you will get an -# error. +# TAG: retry_on_error +# If set to ON Squid will automatically retry requests when +# receiving an error response with status 403 (Forbidden), +# 500 (Internal Error), 501 or 503 (Service not available). +# Status 502 and 504 (Gateway errors) are always retried. +# +# This is mainly useful if you are in a complex cache hierarchy to +# work around access control errors. +# +# NOTE: This retry will attempt to find another working destination. +# Which is different from the server which just failed. +#Default: +# retry_on_error off + +# TAG: as_whois_server +# WHOIS server to query for AS numbers. NOTE: AS numbers are +# queried only when Squid starts up, not for every request. +#Default: +# as_whois_server whois.ra.net + +# TAG: offline_mode +# Enable this option and Squid will never try to validate cached +# objects. +#Default: +# offline_mode off + +# TAG: uri_whitespace +# What to do with requests that have whitespace characters in the +# URI. Options: # +# strip: The whitespace characters are stripped out of the URL. +# This is the behavior recommended by RFC2396. +# deny: The request is denied. The user receives an "Invalid +# Request" message. +# allow: The request is allowed and the URI is not changed. The +# whitespace characters remain in the URI. Note the +# whitespace is passed to redirector processes if they +# are in use. +# encode: The request is allowed and the whitespace characters are +# encoded according to RFC1738. This could be considered +# a violation of the HTTP/1.1 +# RFC because proxies are not allowed to rewrite URI's. +# chop: The request is allowed and the URI is chopped at the +# first whitespace. This might also be considered a +# violation. +#Default: +# uri_whitespace strip + +# TAG: chroot +# Specifies a directory where Squid should do a chroot() while +# initializing. This also causes Squid to fully drop root +# privileges after initializing. This means, for example, if you +# use a HTTP port less than 1024 and try to reconfigure, you may +# get an error saying that Squid can not open the port. #Default: # none -# TAG: client_persistent_connections -# TAG: server_persistent_connections -# Persistent connection support for clients and servers. By -# default, Squid uses persistent connections (when allowed) -# with its clients and servers. You can use these options to -# disable persistent connections with clients and/or servers. +# TAG: balance_on_multiple_ip +# Modern IP resolvers in squid sort lookup results by preferred access. +# By default squid will use these IP in order and only rotates to +# the next listed when the most preffered fails. +# +# Some load balancing servers based on round robin DNS have been +# found not to preserve user session state across requests +# to different IP addresses. # +# Enabling this directive Squid rotates IP's per request. #Default: -# client_persistent_connections on -# server_persistent_connections on +# balance_on_multiple_ip off # TAG: pipeline_prefetch # To boost the performance of pipelined requests to closer -# match that of a non-proxied environment Squid tries to fetch -# up to two requests in parallell from a pipeline. +# match that of a non-proxied environment Squid can try to fetch +# up to two requests in parallel from a pipeline. # -#Default: -# pipeline_prefetch on - -# TAG: extension_methods -# Squid only knows about standardized HTTP request methods. -# You can add up to 20 additional "extension" methods here. +# Defaults to off for bandwidth management and access logging +# reasons. # +# WARNING: pipelining breaks NTLM and Negotiate/Kerberos authentication. #Default: -# none +# pipeline_prefetch off # TAG: high_response_time_warning (msec) # If the one-minute median response time exceeds this value, # Squid prints a WARNING with debug level 0 to get the # administrators attention. The value is in milliseconds. -# #Default: # high_response_time_warning 0 @@ -2708,53 +6588,85 @@ icp_access allow all # value, Squid prints a WARNING with debug level 0 to get # the administrators attention. The value is in page faults # per second. -# #Default: # high_page_fault_warning 0 # TAG: high_memory_warning # If the memory usage (as determined by mallinfo) exceeds -# value, Squid prints a WARNING with debug level 0 to get +# this amount, Squid prints a WARNING with debug level 0 to get # the administrators attention. -# #Default: -# high_memory_warning 0 +# high_memory_warning 0 KB -# TAG: store_dir_select_algorithm -# Set this to 'round-robin' as an alternative. -# +# TAG: sleep_after_fork (microseconds) +# When this is set to a non-zero value, the main Squid process +# sleeps the specified number of microseconds after a fork() +# system call. This sleep may help the situation where your +# system reports fork() failures due to lack of (virtual) +# memory. Note, however, if you have a lot of child +# processes, these sleep delays will add up and your +# Squid will not service requests for some amount of time +# until all the child processes have been started. +# On Windows value less then 1000 (1 milliseconds) are +# rounded to 1000. #Default: -# store_dir_select_algorithm least-load +# sleep_after_fork 0 -# TAG: forward_log +# TAG: windows_ipaddrchangemonitor on|off # Note: This option is only available if Squid is rebuilt with the -# -DWIP_FWD_LOG option +# MS Windows # -# Logs the server-side requests. +# On Windows Squid by default will monitor IP address changes and will +# reconfigure itself after any detected event. This is very useful for +# proxies connected to internet with dial-up interfaces. +# In some cases (a Proxy server acting as VPN gateway is one) it could be +# desiderable to disable this behaviour setting this to 'off'. +# Note: after changing this, Squid service must be restarted. +#Default: +# windows_ipaddrchangemonitor on + +# TAG: eui_lookup +# Whether to lookup the EUI or MAC address of a connected client. +#Default: +# eui_lookup on + +# TAG: max_filedescriptors +# The maximum number of filedescriptors supported. # -# This is currently work in progress. +# The default "0" means Squid inherits the current ulimit setting. # +# Note: Changing this requires a restart of Squid. Also +# not all comm loops supports large values. #Default: -# none +# max_filedescriptors 0 -# TAG: ie_refresh on|off -# Microsoft Internet Explorer up until version 5.5 Service -# Pack 1 has an issue with transparent proxies, wherein it -# is impossible to force a refresh. Turning this on provides -# a partial fix to the problem, by causing all IMS-REFRESH -# requests from older IE versions to check the origin server -# for fresh content. This reduces hit ratio by some amount -# (~10% in my experience), but allows users to actually get -# fresh content when they want it. Note that because Squid -# cannot tell if the user is using 5.5 or 5.5SP1, the behavior -# of 5.5 is unchanged from old versions of Squid (i.e. a -# forced refresh is impossible). Newer versions of IE will, -# hopefully, continue to have the new behavior and will be -# handled based on that assumption. This option defaults to -# the old Squid behavior, which is better for hit ratios but -# worse for clients using IE, if they need to be able to -# force fresh content. +# TAG: workers +# Number of main Squid processes or "workers" to fork and maintain. +# 0: "no daemon" mode, like running "squid -N ..." +# 1: "no SMP" mode, start one main Squid process daemon (default) +# N: start N main Squid process daemons (i.e., SMP mode) # +# In SMP mode, each worker does nearly all what a single Squid daemon +# does (e.g., listen on http_port and forward HTTP requests). #Default: -# ie_refresh off +# workers 1 + +# TAG: cpu_affinity_map +# Usage: cpu_affinity_map process_numbers=P1,P2,... cores=C1,C2,... +# +# Sets 1:1 mapping between Squid processes and CPU cores. For example, +# +# cpu_affinity_map process_numbers=1,2,3,4 cores=1,3,5,7 +# +# affects processes 1 through 4 only and places them on the first +# four even cores, starting with core #1. +# +# CPU cores are numbered starting from 1. Requires support for +# sched_getaffinity(2) and sched_setaffinity(2) system calls. +# +# Multiple cpu_affinity_map options are merged. +# +# See also: workers +#Default: +# none |