Useful commands:
kubectl get # list resources
kubectl describe # resource details
kubectl explain
kubectl get componentstatuses # cluster component health
kubectl get pv --sort-by="spec.capacity.storage" # list persistent volumes by capacity
kubectl run -i --tty busybox --image=busybox -- sh # busybox interactive shell
kubectl run curl --image=radial/busyboxplus:curl -i --tty # interactive shell with curl