Kubernetes: how to debug CrashLoopBackOff

CrashLoopBackOff tells that a pod crashes right after the start. Kubernetes tries to start pod again, but again pod crashes and this goes in loop.

You can check pods logs for any error by kubectl logs <pod-name> -n <namespace> --previous

--previous will show you logs of the previous instantiation of a container

Next, you can check "state reason","last state reason" and "Events" Section by describing pod kubectl describe pod -n

"state reason","last state reason" enter image description here

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Sometimes the issue can be because of the Less Memory or CPU provided to application.

You can access the logs of your pods with

kubectl logs [podname] -p

the -p option will read the logs of the previous (crashed) instance

If the crash comes from the application, you should have useful logs in there.

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