MicroK8s Not Starting on Ubuntu 26.04 LTS

📖 ~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

microk8s status returns not running or not ready, blocking local cluster workloads and CI tests.

Environment & Reproduction

Common after kernel changes, low memory, or interrupted snap refresh operations.

Root Cause Analysis

Critical services such as dqlite or kube-apiserver fail due to resource limits or corrupted state.

Quick Triage

Run microk8s status –wait-ready and check snap service health with systemctl status snap.microk8s*.

Step-by-Step Diagnosis

Collect diagnostics via microk8s inspect and review logs under /var/snap/microk8s/current/var/log/.

Solution – Primary Fix

Restart MicroK8s with sudo microk8s stop && sudo microk8s start, refresh snap if needed, and re-enable required add-ons.

Solution – Alternative Approaches

Reset cluster state using microk8s reset when non-production data can be recreated safely.

Verification & Acceptance Criteria

microk8s kubectl get nodes shows Ready and core add-ons become healthy.

Rollback Plan

Revert to previous snap revision if current channel update introduced startup regression.

Prevention & Hardening

Reserve adequate RAM and disk IOPS and avoid abrupt shutdowns during control-plane updates.

Related Errors & Cross-Refs

Related issues include API server timeout and failing container runtime sockets.

Related tutorial: View the step-by-step tutorial for Ubuntu 26.04 LTS.

View all Ubuntu 26.04 LTS tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

MicroK8s documentation, snap service management docs, and Ubuntu Kubernetes guides.