Ubuntu 22.04 LTS – Docker daemon fails after daemon.json change – 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

Containers stop because Docker daemon cannot start.

Environment & Reproduction

Appears after manual edits to daemon.json.

Root Cause Analysis

Malformed JSON or unsupported keys break daemon initialization.

Quick Triage

Inspect daemon config and service logs.

Step-by-Step Diagnosis

Locate invalid fields and compare with supported options.

Solution – Primary Fix

Correct daemon.json and restart Docker.

Solution – Alternative Approaches

Temporarily disable custom config and run default daemon settings.

Verification & Acceptance Criteria

Docker is active and test container runs successfully.

Rollback Plan

Restore known-good daemon config backup.

Prevention & Hardening

Validate daemon config changes in staging before rollout.

Related Errors & Cross-Refs

Related to cgroup driver mismatches and storage-driver issues.

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

Ubuntu Docker Engine configuration documentation.