首先类似于Docker容器，Kubernetes 使用kubectl 进行命令行操作

进入docker容器 ：

docker exec -ti  <your-container-name>   /bin/sh

进入Kubernetes的pod：

kubectl exec -ti <your-pod-name>  -n <your-namespace>  -- /bin/sh

Overview of kubectl

kubectl exec - Execute a command against a container in a pod.

// Get output from running 'date' from pod <pod-name>. By default, output is from the first container.
$ kubectl exec <pod-name> date

// Get output from running 'date' in container <container-name> of pod <pod-name>.
$ kubectl exec <pod-name> -c <container-name> date

// Get an interactive TTY and run /bin/bash from pod <pod-name>. By default, output is from the first container.
$ kubectl exec -ti <pod-name> /bin/bash