How do you debug CrashLoopBackOff in Kubernetes?
Reported in OVHcloud European engineering loops. DevOps troubleshooting interview question for container orchestration.
Interview scenario
Often asked in OVHcloud loops at European offices (London, Berlin, Amsterdam, Paris, Stockholm, Dublin, and remote EU). Prepare a clear spoken answer plus key trade-offs.
Model answer
Try answering aloud first
Cover trade-offs, structure, and a concrete example before revealing the baseline response.
How to frame this at OVHcloud: Connect your answer to measurable impact, clarity of thought, and trade-offs the team cares about. Below is a strong baseline response you can adapt with your own project examples.
Start with kubectl describe pod and container logs to identify whether failure is from app crash, failed health checks, or missing configuration. Check previous container logs for startup errors that vanish after restart.
Validate probes, resource limits, secret mounts, and dependent service connectivity. Crash loops often come from incorrect env vars, migration failures, or too aggressive liveness probe timings.
A strong answer includes iterative rollback strategy and canary validation before reapplying changes cluster-wide.
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