Kubectl

Get Kube configs from the .kube config file

kubectl config get-contexts

Select specific cluster to work on

kubectl config use-context yourClusterName

Get Kubernetes pods

kubectl get pods

Restart deployments - sometimes useful when implementing a new config change or pulling an updated image

kubectl rollout restart deployments deploymentName

Find out the storage Class Names

kubectl get sc

Get the details of the persistent volume - including how they are attached etc

kubectl get pv

If your cluster finds it self in a difficult spot and being starved of resources. Your pods might start to get evicted because of "Disk Pressure" or some other error. If you do not action these quickly, you can end up with a high number of evicted pods in the cluster. How would you identify them and remove them?

you can use these two commands:

To Identify them:

kubectl get pods --all-namespaces -o json | jq '.items[] | select(.status.reason=="Evicted") | {namespace: .metadata.namespace, name: .metadata.name, status: .status.phase, reason: .status.reason}'

To Remove them:

kubectl get pods --all-namespaces -o json | jq '.items[] | select(.status.reason!=null) | select(.status.reason | contains("Evicted")) | "kubectl delete pod \(.metadata.name) -n \(.metadata.namespace)"' | xargs -n 1 bash -c