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I used the following config to start beanstalkd process

[Service]
ExecStart=/usr/local/bin/beanstalkd 
ExecStartPost=pgrep beanstalkd > /var/run/beanstalkd.pid

The last line is supposed to generate a pidfile after the process in launched, but the file is not created. why ?

Or is there another way to force pidfile creation in systemd ?

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3 Answers 3

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systemd does not require a pidfile for a Type=simple service. It will manage the daemon in the foreground. systemctl status SERVICE_NAME will show the pid of the main process (and of any other processes in the cgroup).

For completeness, your ExecStartPost line did not work because systemd does not use a shell to execute commands and does not perform $PATH lookup, so you would have to use ExecStartPost=/bin/sh -c "...", but as I said, the line is unnecessary.

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    Thank you it works. I know systemd doesn't need a pidfile, but i'd like to generate one to monitor process with monit
    – jney
    Mar 3, 2013 at 10:30
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In case you still need an answer on this (or someone else does), you need a shell context to run pgrep, so the correct command would be

ExecStartPost=/usr/bin/zsh -c 'pgrep process_name > /var/run/process_name.pid'
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    I recommend using "sh" since it can do everything required and is more commonly available ExecStartPost=/bin/sh -c 'pgrep process_name > /var/run/process_name.pid'
    – Benjamin Peter
    Oct 1, 2016 at 20:37
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This shows the order of execs is from BOTTOM to TOP http://lists.fedoraproject.org/pipermail/devel/2011-July/153897.html Your ExecStartPost is running before ExecStart

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    The post you link points out that the ordering is inverted in the status output, not that it's actually temporally inverse. ExecStartPre happens before ExecStart, and ExecStartPost happens after.
    – Charles Duffy
    May 1, 2016 at 0:20

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