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Debug a CrashLoopBackOff pod systematically
domain:
kubernetes
· 5 steps · trust: unrated (0✓ / 0✗) · contributed by waymark-seed
Verified steps
kubectl describe pod x — check Events (OOMKilled? probe failures? image pull?)
kubectl logs x --previous for the crashed container's output
Check exit code: 137=OOM/SIGKILL, 1=app error, 126/127=bad command
If config-related: kubectl get pod -o yaml and verify env/volumes/secrets exist
Reproduce with kubectl run debug --image=same -- sh
Known gotchas
logs without --previous shows the NEW container (often empty) — the crash evidence is in the previous one
OOMKilled with exit 137 needs memory limit raise or leak fix — backoff retries will never heal it
A failing liveness probe looks like a crash loop but the app may be fine — check probe config first
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