Any way to register application with systemd watchdog at runtime ? I mean don't use systemd unit file, via systemd API for example
Linux watchdog is used for system reset only ? Can it be used for application reset ?
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Systemd's watchdog can be mainly used for 3 different actions:
example unit file:
[Unit] Description=My Little Daemon Documentation=man:mylittled(8) [Service] ExecStart=/usr/bin/mylittled WatchdogSec=30s Restart=on-failure StartLimitInterval=5min StartLimitBurst=4 StartLimitAction=reboot-force
The example is taken from: http://0pointer.de/blog/projects/watchdog.html, which gives a pretty complete overview of what and how you can use the watchdog service.
The Linux watchdog daemon should be used for system reset jobs, though it can also run a "repair binary" on persistent errors that could be used to fix or restart a process. Generally speaking, to monitor daemon processes and restart them you should use the init/upstart/systemd supported methods as already answered and keep the watchdog operation for the most serious "only a reboot is likely to fix things" situations.