Ubuntu 18.04 Docker Fails to Start After Upgrade

📖 ~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

Container workloads stop because Docker daemon cannot initialize.

Environment & Reproduction

Seen after kernel updates, storage driver changes, or package upgrades.

Root Cause Analysis

Incompatible cgroup config, corrupted overlay storage, or bad daemon.json settings.

Quick Triage

Check systemctl status docker and verify available disk/inode capacity.

Step-by-Step Diagnosis

Inspect daemon logs, validate storage driver, and test daemon config syntax.

Solution – Primary Fix

Fix daemon config, clear broken overlay artifacts, and restart docker service.

Solution – Alternative Approaches

Temporarily switch storage driver only if migration path is planned and validated.

Verification & Acceptance Criteria

docker ps, image pulls, and container restarts complete without errors.

Rollback Plan

Restore previous docker package version and daemon config from backup.

Prevention & Hardening

Validate runtime updates in staging and keep daemon config under version control.

Related Errors & Cross-Refs

Failed to start Docker daemon, overlay mount errors, cgroup initialization failed.

Related tutorial: View the step-by-step tutorial for Ubuntu 18.04 LTS.

View all Ubuntu 18.04 LTS tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

Docker engine docs and Ubuntu container host best practices.