Restart OpenDKIM from time to time

[link2xt]

OpenDKIM leaks memory, reaches 5 GB and keeps growing.

We can set WatchdocSec= (see systemd.service(5)) to restart it from time to time. And need to make sure systemd restarts the service when it is killed by watchdog.

[missytake]

I don't think WatchdocSec= works for us; it would only trigger when opendkim stops responding, and as far as I understood it, functionality doesn't actually deteriorate.

But it seems RuntimeMaxSec= does what we want: https://stackoverflow.com/a/50332245

[adbenitez]

WatchdogSec would also work for restarting (I have been using it to restart DC bots every 1h etc) and it is the accepted answer in the linked SO question, but it probably makes sense to use the more modern approach