Usage:  kubectl run NAME --image=image [--env="key=value"] [--port=port] [--replicas=replicas] [--dry-run=bool] [options]
Man:    通过kubectl创建一个deployment或者Job。name为deployment的名字，image为容器的镜像
        port为对容器外暴露的端口，replicas为副本数，dry-run为干运行(不创建pod)

[root@hdss7-21 ~]# kubectl run web-deploy --image=harbor.od.com/public/nginx:latest --replicas=2
[root@hdss7-21 ~]# kubectl get deployment
NAME         READY   UP-TO-DATE   AVAILABLE   AGE
web-deploy   2/2     2            2           92s
[root@hdss7-21 ~]# kubectl get pods|grep web-deploy
web-deploy-bc78f6667-5s6rq   1/1     Running   0          119s
web-deploy-bc78f6667-h67zb   1/1     Running   0          119s