[systemd-devel] Quick ? about ExecStartPre and Restart

Reindl Harald h.reindl at thelounge.net
Wed Jul 3 16:51:31 PDT 2013

Am 04.07.2013 01:45, schrieb Paul D. DeRocco:
>> From: Reindl Harald [mailto:h.reindl at thelounge.net] 
>> Am 04.07.2013 00:38, schrieb Paul D. DeRocco:
>>> I'm new to systemd, and I'm confused about something. The 
>>> docs include the
>>> following sentence under the Restart directive:
>>> "Configures whether the service shall be restarted when the 
>>> service process
>>> exits, is killed, or a timeout is reached. The service 
>>> process may be the
>>> main service process, but also one of the processes specified with
>>> ExecStartPre=, ExecStartPost=, ExecStopPre=, ExecStopPost=, 
>>> or ExecReload=."
>>> Read literally, this suggests that if I set this to "on-success" or
>>> "always", and I have an ExecStartPre that runs a quick 
>>> command (in my case,
>>> to copy my main service executable from a flash drive to a 
>>> RAM drive), then
>>> as soon as that completes, systemd will say, "Hey, the service has
>>> terminated, time to restart it" and never get around to the 
>>> ExecStart that
>>> really does the work.
>>> Is that really true? Or is that just a mistake in the docs? 
>>> If it's not a
>>> mistake, how do I configure it so that it won't restart 
>>> when the command
>>> launched by ExecStartPre terminates with a 0 exit code, but 
>>> will restart if
>>> the actual service started by ExecStart terminates with a 0 
>>> exit code?
>> it is not true and the documentation has no mistake
>> systemd does *not* consider the service as failed if ExecStartPre
>> terminates with a clean 0 exit code - it is considered as failed
>> if the ExecStartPre command does return a *non zero* code and
>> even that can be avoided with ExecStartPre=-/path/to/bin as the
>> doc states
> I understand that, but I want the service to be restarted on success, not on
> failure. By that I mean that if my ExecStart process (the actual service)
> ever terminates with a 0 exit code, I want the whole thing to restart,
> beginning with the ExecStartPre. But I DON'T want the 0 exit code from
> ExecStartPre to restart anything, because that's not the actual service

so make *two* services while the first replaces ExecStartPre
and it's "ExecStartPost=/usr/bin/systemctl start service2.service"

"but I want the service to be restarted on success" is generally
very uncommon and you can hardly have two commands in a single
service with the opposite behavior

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