Ubuntu 22.04 LTS – root filesystem full causes service failures – 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

Services fail to write state files, logs stop rotating, and package operations fail.

Environment & Reproduction

Typically caused by runaway logs, cache growth, or large temporary artifacts.

Root Cause Analysis

Root partition reaches 100 percent utilization, exhausting writable space for system operations.

Quick Triage

Find largest directories under root and identify recent growth patterns.

Step-by-Step Diagnosis

Inspect journal, apt caches, and container layers for major space consumers.

Solution – Primary Fix

Purge obsolete packages, rotate logs, and reclaim cache and temporary files safely.

Solution – Alternative Approaches

Extend root volume or move large data paths to dedicated storage mounts.

Verification & Acceptance Criteria

Root usage falls below operational threshold and impacted services recover.

Rollback Plan

Restore deleted artifacts from backup if application functionality is unexpectedly impacted.

Prevention & Hardening

Set disk usage alerts and enforce retention policies for logs and package caches.

Related Errors & Cross-Refs

May trigger read-only remounts, database write failures, and apt temporary file errors.

Related tutorial: View the step-by-step tutorial for Ubuntu 22.04 LTS.

View all Ubuntu 22.04 LTS tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

Disk space management and log retention best practices for Ubuntu 22.04 LTS hosts.