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| -rw-r--r-- | sysvinitfiles | 117 |
1 files changed, 115 insertions, 2 deletions
diff --git a/sysvinitfiles b/sysvinitfiles index ab0c510d..7fed5046 100644 --- a/sysvinitfiles +++ b/sysvinitfiles @@ -1,9 +1,110 @@ +Writing a System V init script for Red Hat Linux +================================================ + +All System V init scripts are named /etc/rc.d/init.d/<servicename> +where <servicename> is the name of the service. There must be no +".init" suffix. + + +Sample Script +============= + +#!/bin/bash +# +# /etc/rc.d/init.d/<servicename> +# +# <description of the *service*> +# <any general comments about this init script> +# +# <tags -- see below for tag definitions. *Every line* from the top +# of the file to the end of the tags section must begin with a # +# character. After the tags section, there should be a blank line. +# This keeps normal comments in the rest of the file from being +# mistaken for tags, should they happen to fit the pattern.> + +# Source function library. +. /etc/rc.d/init.d/functions + +<define any local shell functions used by the code that follows> + +case "$1" in + start) + echo -n "Starting <servicename> services: " + <start daemons, perhaps with the daemon function> + touch /var/lock/subsys/<servicename> + ;; + stop) + echo -n "Shutting down <servicename> services: " + <stop daemons, perhaps with the killproc function> + rm -f /var/lock/subsys/<servicename> + ;; + status) + <report the status of the daemons in free-form format, + perhaps with the status function> + ;; + restart) + <restart the daemons, normally with $0 stop; $0 start> + ;; + reload) + <cause the service configuration to be reread, either with + kill -HUP or by restarting the daemons, possibly with + $0 stop; $0 start> + ;; + probe) + <optional. If it exists, then it should determine whether + or not the service needs to be restarted or reloaded (or + whatever) in order to activate any changes in the configuration + scripts. It should print out a list of commands to give to + $0; see the description under the probe tag below.> + ;; + *) + echo "Usage: <servicename> {start|stop|status|reload|restart[|probe]" + exit 1 + ;; +esac + + + +Functions in /etc/rc.d/init.d/functions +======================================= + +daemon [+/-nicelevel] program [arguments] [&] + + Starts a daemon, if it is not already running. Does + other useful things like keeping the daemon from dumping + core if it terminates unexpectedly. + +killproc program [signal] + + Sends a signal to the program; by default it sends a SIGTERM, + and if the process doesn't die, it sends a SIGKILL a few + seconds later. + + It also tries to remove the pidfile, if it finds one. + +pidofproc program + + Tries to find the pid of a program; checking likely pidfiles, + using the pidof program, or even using ps. Used mainly from + within other functions in this file, but also available to + scripts. + +status program + + Prints status information. Assumes that the program name is + the same as the servicename. + + +Tags +==== + # chkconfig: <startlevellist> <startpriority> <endpriority> Required. <startlevellist> is a list of levels in which the service should be started by default. <startpriority> and <endpriority> are priority numbers. For example: # chkconfig: 2345 20 80 + Read 'man chkconfig' for more information. # description: <multi-line description of service> @@ -45,7 +146,19 @@ Optional, used IN PLACE of autoreload, processname, config, and pidfile. If it exists, then a proper reload-if-necessary - cycle may be acheived by running this command: - /etc/rc.d/init.d/SCRIPT `/etc/rd.d/init.d/SCRIPT probe` + cycle may be acheived by running these commands: + + command=$(/etc/rd.d/init.d/SCRIPT probe) + [ -n "$command" ] && /etc/rc.d/init.d/SCRIPT $command + where SCRIPT is the name of the service's sysv init script. + Scripts that need to do complex processing could, as an + example, return "run /var/tmp/<servicename.probe.$$" + and implement a "run" command which would execute the + named script and then remove it. + + Note that the probe command should simply "exit 0" if nothing + needs to be done to bring the service into sync with its + configuration files. + |