1、将新的config文件替换到制定的目录下

通常情况下，Kubernetes config 文件的默认位置为：

Linux/macOS：~/.kube/config（当前用户的主目录下的 .kube/config 文件）
Windows：%USERPROFILE%\.kube\config（当前用户的主目录下的 .kube\config 文件）

2、列出所有的命名空间

kubens

sunyuhua@sunyuhua-PC:~$ kubens
infra
global
traefik
dev-mgmt
kube-system
kube-public
logging
uat-mgmt
kube-node-lease

3、切换到自己所需要的命名空间

kubens infra

sunyuhua@sunyuhua-PC:~$ kubens global
Context "cci80knavo1j1h24nq7s0@4176145-kci80n8qvo1j1h24nq80g" modified.
Active namespace is "global".

4、查找命名空间下的pod节点

kubectl get pod

sunyuhua@sunyuhua-PC:~$ kubectl get pod
NAME                            READY   STATUS    RESTARTS   AGE
fastone-help-859b9d4497-h9gcz   1/1     Running   0          5d2h
balance-76cd5568f5-nbb96        1/1     Running   0          5d2h
billing-mgr-6b7cb86bcd-l8ndz    1/1     Running   0          5d2h
gateway-6bcf84d88-vgw4d         1/1     Running   0          5d2h
notification-6889988575-hkzrb   1/1     Running   0          5d2h
cc-ui-794bffb66b-cwdkh          1/1     Running   0          2d23h
global-api-5d75f6498b-m7t4d     1/1     Running   0          5d2h

5、进入pod内部进行操作

kubectl exec -it XXXXX /bin/bash -n infra

sunyuhua@sunyuhua-PC:~$ kubectl exec -it postgres-billing-fbdf45b4d-qn84z /bin/bash -n infra
kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl exec [POD] -- [COMMAND] instead.
bash-5.1# psql -U sa
psql (13.5)
Type "help" for help.