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<H1>[Mageia-dev] systemd vs dm</H1>
<B>Colin Guthrie</B>
<A HREF="mailto:mageia-dev%40mageia.org?Subject=Re%3A%20%5BMageia-dev%5D%20systemd%20vs%20dm&In-Reply-To=%3C4E747E5A.3060904%40colin.guthr.ie%3E"
TITLE="[Mageia-dev] systemd vs dm">mageia at colin.guthr.ie
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<I>Sat Sep 17 13:02:50 CEST 2011</I>
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<PRE>'Twas brillig, and Dick Gevers at 17/09/11 11:40 did gyre and gimble:
><i> On Sat, 17 Sep 2011 11:16:57 +0100, Colin Guthrie wrote about Re:
</I>><i> [Mageia-dev] systemd vs dm:
</I>><i>
</I>>><i> Well that's slightly disturbing. It seems that rsyslog was started but
</I>>><i> not by systemd.
</I>>><i>
</I>>><i> Can do do some kind of pstree type analysis (perhaps also using cgroups
</I>>><i> stuff) to work out what process actually started rsyslog?
</I>><i>
</I>><i> pstree is not quite unequivocal, because it shows systemd at the top of
</I>><i> every running process, even those surely not started by systemd but e.g. by
</I>><i> the current user.
</I>
Yeah that's expected. Everything is a child of pid 1 really, but what
would be interesting is if rsyslog is a direct child of pid 1 or if
there are any other processes in between, but I guess not.
><i> But on the other hand systemd has PID 1 so it's reasonable to assume
</I>><i> everything stems from it.
</I>
Yup.
><i> Although when I do lsof |grep rsys |grep syst it returns nothing, so
</I>><i> perhaps that means rsyslog was not started by systemd: we'd have to compare
</I>><i> with a system where systemctl status rsyslog.service gives a better result.
</I>
Nah I wouldn't expect rsyslog to know anything specifically about
systemd, so this would be the expected output.
><i> "lsof |grep cgrou" returns only one line:
</I>><i>
</I>><i> systemd 1 root 6r DIR 0,18
</I>><i> 0 193 /sys/fs/cgroup/systemd/system
</I>><i>
</I>><i> I hope this gives some clues.
</I>
Sadly not.
What would be useful is to find the pid of rsyslog (mine is 1505), and
then do:
[<A HREF="https://www.mageia.org/mailman/listinfo/mageia-dev">root at jimmy</A> ~]# cat /proc/1505/cgroup
8:blkio:/
7:net_cls:/
6:freezer:/
5:devices:/
4:memory:/
3:cpuacct,cpu:/system/rsyslog.service
2:cpuset:/
1:name=systemd:/system/rsyslog.service
If it looks similar to mine then it has been started by systemd but it's
somehow "lost" that info.
I wonder, do you do anything special with either /var /var/run or /run
directories? Are they on separate partitions or anything?
Col
--
Colin Guthrie
mageia(at)colin.guthr.ie
<A HREF="http://colin.guthr.ie/">http://colin.guthr.ie/</A>
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