Ubuntu 14.04 LTS Cron Jobs Not Running on Schedule

📖 ~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

Backups, reports, or maintenance tasks fail silently, creating operational risk and backlog.

Environment & Reproduction

Observed after timezone drift, crontab edits, or daemon restarts not completed.

Root Cause Analysis

Syntax errors, environment assumptions, or disabled daemon prevent scheduled execution.

Quick Triage

Confirm cron daemon is active and inspect logs for parser or permission errors.

Step-by-Step Diagnosis

Validate crontab syntax, script shebangs, executable bits, and PATH dependencies.

Solution – Primary Fix

Correct malformed entries, provide explicit env vars, and restart cron service.

Solution – Alternative Approaches

Migrate critical schedules to systemd timers on newer platforms where possible.

Verification & Acceptance Criteria

Scheduled jobs execute at expected intervals and produce logged completion markers.

Rollback Plan

Restore previous crontab from backup if revised schedule causes task duplication.

Prevention & Hardening

Use monitored wrapper scripts and alerting on missed schedule windows.

Related Errors & Cross-Refs

bad minute, command not found, and permission denied in cron contexts.

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

Cron manual pages and Ubuntu automation best practices.