Linux CLI - Cron and Scheduling
Why might a systemd timer with
OnCalendar=*-*-* 00:00:00 and Persistent=false miss running after a system reboot?Why might a systemd timer with OnCalendar=*-*-* 00:00:00 and Persistent=false miss running after a system reboot?
hard📝 Conceptual Q10 of 15
Step-by-Step Solution
Solution:
Step 1: Understand Persistent=false effect
When Persistent is false, systemd does not run missed timer events after the system was off.Step 2: Analyze other options
OnCalendar supports midnight times. Timers start automatically if enabled. Timers can run at midnight.Final Answer:
Persistent=false disables running missed jobs after downtime -> Option DQuick Check:
Persistent=false skips missed timer runs after reboot [OK]
Quick Trick: Persistent=false skips missed timer runs after reboot [OK]
Common Mistakes:
- Thinking OnCalendar can't run at midnight
- Assuming timers need manual start after reboot
- Believing timers can't run at midnight
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