[sr-dev] systemd watchdog

[Daniel-Constantin Mierla]

As I understand, the application has to periodically send the
notification to systemd service manager. I am not sure if this will help
with kamailio multiprocesses, when each of them can hung, not only the
main process.

Anyhow, there is systemdops module that tries to collect the features
related to systemd.

The best would be if there is a shutdown time limit that systemd can
watch and if not, do kill -9.

Cheers,
Daniel

On 26.06.21 19:08, Sergey Safarov wrote:
> I have observed a case when Kamaili debug module try to grab the lock
> on shutdown and not able to do it.
> As a result, the Kamailio process is stuck and not able to restart
> (dead lock).
>
> To resolve such a case i want to utilize systemd watchdog feature
> https://www.freedesktop.org/software/systemd/man/sd_watchdog_enabled.html#
> <https://www.freedesktop.org/software/systemd/man/sd_watchdog_enabled.html#>
>
> To use this feature I need send  sd_notify(3) with a message string of
> "WATCHDOG=1" from main process
> https://www.freedesktop.org/software/systemd/man/sd_watchdog_enabled.html#
> <https://www.freedesktop.org/software/systemd/man/sd_watchdog_enabled.html#>
>
> According to systemd doc only one process to send watchdog
> If the $WATCHDOG_USEC environment variable is set, and the
> $WATCHDOG_PID variable is unset or set to the PID of the current
> process, the service manager expects notifications from this process.
> https://www.freedesktop.org/software/systemd/man/sd_watchdog_enabled.html#
> <https://www.freedesktop.org/software/systemd/man/sd_watchdog_enabled.html#>
>  
> Additional info at
> https://lists.freedesktop.org/archives/systemd-devel/2018-January/040185.html
> <https://lists.freedesktop.org/archives/systemd-devel/2018-January/040185.html>
>
> Could you suggest how to embed this systemd call to the main process?
>
> Sergey
>
>
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-- 
Daniel-Constantin Mierla -- www.asipto.com
www.twitter.com/miconda -- www.linkedin.com/in/miconda

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