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Fix a systemd Timer That Never Runs: OnCalendar, Persistent and Service Failures

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Self-Hosting & Infra intermediate 6 min read $0.01 Updated 2026-10-19

Debugging systemd timers: systemctl list-timers, systemd-analyze calendar, timer versus service enablement, Persistent=true for missed runs, RandomizedDelaySec, user timers and linger, environment differences from a shell, and journal logs.

Your .timer is enabled but the job never runs. Check list-timers, validate OnCalendar with systemd-analyze, enable the timer not the service, read the service journal, and fix environment and path assumptions.

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#systemd#timers#linux#scheduling#oncalendar

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