📖 ~1 min read
Table of contents
Symptom & Impact
Scheduled maintenance and automation tasks do not execute on time.
Environment & Reproduction
Appears after upgrades, daemon disablement, or malformed crontab entries.
Root Cause Analysis
Cron daemon inactive or invalid job definitions prevent schedule execution.
Quick Triage
Check cron daemon status and verify recent task execution markers.
Step-by-Step Diagnosis
Inspect system and user crontabs, environment assumptions, and log output.
Solution – Primary Fix
Restore cron service, correct job syntax, and ensure executable permissions.
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Solution – Alternative Approaches
Migrate critical jobs to systemd timers for stronger dependency control.
Verification & Acceptance Criteria
Jobs run at expected intervals and produce validated outputs.
Rollback Plan
Reinstate previous crontab and service settings if behavior regresses.
Prevention & Hardening
Add cron health checks and alert on missed execution windows.
Related Errors & Cross-Refs
Related to PATH assumptions and shell interpreter mismatches in jobs.
Related tutorial: View the step-by-step tutorial for debian-11.
View all debian-11 tutorials on the Tutorials Hub →
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
Cron operations and timer migration guidance for Debian.
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