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CarlosDomingues/systemd-timers-example.md

Created March 21, 2022 13:43
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systemd timers example
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systemd-timers-example.md

A simple example of systemd timers. Inspired by this blog post.

1 - Go to /etc/systemd/system

2 - Create a FreeMemoryStatistics.service unit file like so:

[Unit]
Description=Logs free memory statistics to the systemd journal
Wants=FreeMemoryStatistics.timer

[Service]
Type=oneshot
ExecStart=/usr/bin/free

[Install]
WantedBy=multi-user.target

3 - Create a FreeMemoryStatistics.timer unit file like so:

[Unit]
Description=Logs free memory statistics to the systemd journal
Requires=FreeMemoryStatistics.service

[Timer]
Unit=FreeMemoryStatistics.service
OnCalendar=*-*-* *:*:00

[Install]
WantedBy=timers.target

4 - Start the service: sudo systemctl start FreeMemoryStatistics.service

5 - You should see the output of the free command being executed every minut: journalctl -S today -f -u FreeMemoryStatistics.service

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