Usage:  kubectl delete ([-f FILENAME] | [-k DIRECTORY] | TYPE [(NAME | -l label | --all)]) [options]
Man:    删除指定资源

[root@hdss7-21 ~]# kubectl get deployment -n app
NAME                         READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/app-deploy   1/1     1            1           35m
[root@hdss7-21 ~]# kubectl delete deployment app-deploy -n app
deployment.extensions "app-deploy" deleted
[root@hdss7-21 ~]# kubectl delete ns app
namespace "app" deleted