Ubuntu 14.04 LTS – cron jobs stop running unexpectedly

📖 ~1 min read

Table of contents

1. Symptom & Impact
2. Environment & Reproduction
3. Root Cause Analysis
4. Quick Triage
5. Step-by-Step Diagnosis
6. Solution – Primary Fix
7. Solution – Alternative Approaches
8. Verification & Acceptance Criteria
9. Rollback Plan
10. Prevention & Hardening
11. Related Errors & Cross-Refs
12. References & Further Reading

Symptom & Impact

Scheduled scripts fail to execute, causing missed maintenance and stale data.

Environment & Reproduction

Seen after permission changes, malformed crontabs, or cron service interruptions.

Root Cause Analysis

cron daemon not running or job definitions fail due environment and syntax issues.

Quick Triage

Check cron service status, system logs, and crontab parse validity.

Step-by-Step Diagnosis

Review cron logs, script permissions, and executable path assumptions.

Solution – Primary Fix

Correct crontab syntax, set explicit environment paths, and restart cron service.

Solution – Alternative Approaches

Migrate critical schedules to monitored orchestration tools for reliability.

Verification & Acceptance Criteria

Jobs run at expected intervals and produce successful execution logs.

Rollback Plan

Restore previous crontab entries and scripts if new schedule fails.

Prevention & Hardening

Implement cron health checks and alerting for missed run windows.

Related Errors & Cross-Refs

Related issues include bad minute format and command not found in cron context.

Related tutorial: View the step-by-step tutorial for Ubuntu 14.04 LTS.

View all Ubuntu 14.04 LTS tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

See Ubuntu cron administration and scheduler troubleshooting documentation.