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Systemd provides unit.timer files that go together with unit.service files to schedule the service file
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When using systemd timers, the timer should be enabled / started, and NOT the service unit
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systemd timers are often installed from RPM packages
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In the timer unit file, the OnCalendar option specifies when the service should be started
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On RHEL 9, systemd timers are the default way for scheduling recurring services