I was watching video about kubectl by janakiram and surprising I found there is also world of commands rather than create, delete, get. kubectl has lots of interesting easter eggs.

Some of the cool things I found as below,

  • List pod along with node name on which they are running
kubectl get pods -o wide
  • If you want yaml or json configurations of your application(maybe pod,deployment or service,etc)
kubectl get pod web -o=yaml/json
  • CLI hacks to retrieve minimal information (In this case, pod name and node name)
kubectl get pod -o wide | awk {'print $1" " $7'} | column -t
  • you can directly edit configurations
kubectl edit pod/web
  • You can mention editor of your choice using KUBE_EDITOR variable,
KUBE_EDITOR="sublime" kubectl edit pod/web
  • If we want to get any specific thing from configurations
kubectl get pods web -o jsonpath={.spec.containers[*].name}
  • cordon will mark node as unschedulable
kubectl cordon <ip-of-node>
  • uncordon will mark node as schedulable again
kubectl uncordon <ip-of-node>
  • The given node will be marked unschedulable to prevent new pods from arriving. ‘drain’ evicts the pods . Otherwise, The ‘drain’ evicts or deletes all pods except replicationcontrollers pods, etc
kubectl drain <node>
  • Drain node “foo”, even if there are pods not managed by a ReplicationController, ReplicaSet, Job, DaemonSet or StatefulSet on it
kubectl drain <node> --force
  • Create proxy server between localhost and kubernetes API server
kubectl proxy
  • you can mention port of your choice as well,
kubectl proxy --port=8000
  • We can forward local ports to pod (useful for debugging frontend application)
kubectl port-forward <pod_name> <host_port>:<container_port>
  • Copy files to and from container to our machine
kubectl cp <file> <podname>:<path>
  • Sometime you need shortcuts to increase your speed, productivity something like po for pods, deploy for deployments, you can find all shortcuts here,
kubectl explain

Thanks janakiram for awesome tutorial.

Reference