systemd

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Auto-restart services

For non-systemd-native services like apache2 or coturn, you can implement the systemd behavior of auto-restart services by adding a config override:

cat /etc/systemd/system/coturn.service.d/override.conf
[Service]
Restart=always
RestartSec=5s
PIDFile=/var/run/turnserver.pid
RemainAfterExit=no
Type=forking

You can add that with systemctl edit coturn.service or apply via ansible like in commit [master 454c0a8] Autorestart coturn on failure

For a normal service where systemd correctly detects that the service is failed when the process died, you only need to add:

[Service]
Restart=always
RestartSec=5s

Note, that to restart forever, RestartSec will need to be >=3s, because of the defaults listed in /etc/systemd/system.conf:

#DefaultStartLimitIntervalSec=10s
#DefaultStartLimitBurst=5

If you want to restart faster, you need to change those values, for example:

[Unit]
StartLimitIntervalSec=0

However, you may also want to consider setting StartLimitAction= (man systemd.unit) to reboot the system.