Ubuntu 14.04 LTS – cron jobs stop running after environment changes – Fix & Prevention

📖 ~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 automation does not execute, causing data and maintenance delays.

Environment & Reproduction

Common after script relocations, permission changes, or shell profile updates.

Root Cause Analysis

Cron runs with minimal environment and fails commands relying on interactive PATH.

Quick Triage

Verify cron daemon state and review mailbox or syslog for command errors.

Step-by-Step Diagnosis

Check crontab syntax, executable bits, and environment assumptions.

Solution – Primary Fix

Use absolute paths, set required environment variables, and correct permissions.

Solution – Alternative Approaches

Migrate critical jobs to supervised task runners with explicit environment.

Verification & Acceptance Criteria

Jobs run on schedule and produce expected output artifacts.

Rollback Plan

Restore previous crontab and script versions if new schedule fails.

Prevention & Hardening

Add cron health checks and alerting on missed runs.

Related Errors & Cross-Refs

Often linked to time drift, permission denial, and missing binary paths.

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 administration and troubleshooting documentation.