Question : What is crashloopbackoff  and why the pods getting crashloopbackoff error ?

Answer :

CrashLoopBackOff is a common Kubernetes (k8s) error, indicating a pod constantly crashing in an endless loop. 

CrashLoopBackOff means the pod has failed/exited unexpectedly/has an error code that is not zero. 

The application inside the container keeps crashing. Some type of parameters of the pod or container have been configured incorrectly. An error has been made when deploying Kubernetes and you can find it by depending on the delay in your environment you'll want to toggle the time settings. This alert is configured to trigger if any pod restarts more than 3 times over a 4 minute span, which is usually an indicator of a CrashLoopBackOff event.