cheatsheet:systemdtimer [Tuxtrooper Wiki]

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====== Timers ======
Create a service
<code>
[Unit]
Description=IPv6 monitoring

[Service]
User=root
ExecStart=/usr/local/bin/test-ip6

[Install]
WantedBy=basic.target
</code>
Create a timer with the same name but suffixed with .timer
<code>
[Unit]
Description=Run test-ip6 every 10 minutes

[Timer]
OnBootSec=10min
OnUnitActiveSec=10min
Unit=test.service

[Install]
WantedBy=timers.target
</code>
Timer options:
  * OnBootSec: duration after boot before starting the service
  * OnUnitActiveSec: duration between two executions
  * Unit: define unit to use but by default look for the same name .service file
  * OnCalendar:Control the timer like a cron task
  * AccuracySec: define execution window
  * Persistent (Default is false): If true, it will do as anacron and store last execution to be detect if run is needed after inactivity (like when the device is powered off)


Enable the timer:
<code>
systemctl enable --now test.timer
</code>