[create a Namespace]
$ kubectl create ns prod-nginx

[details of the Pod]
$ kubectl get pod -n prod-nginx -o wide --show-labels

[details of the Service]
$ kubectl get svc -n prod-nginx -o wide --show-labels

[create a Pod]
$ kubectl run -it --rm -n prod-nginx --image xxradar/hackon --env="POD=$POD" debug

[create a NetworkPolicy]
$ kubectl apply -n prod-nginx -f NetworkPolicy_1.yaml

[change a new VALUE to existing KEY for Namespace]
$ kubectl label ns kube-system kubernetes.io/metadata.name=kube-system --overwrite
