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# 此nginx pod是存在的
[root@pool1 ~]# kubectl get pod 
NAME          READY   STATUS    RESTARTS   AGE
client-pod1   1/1     Running   0          15m
nginx         1/1     Running   0          43m
# 尝试进入pod
[root@pool1 ~]# kubectl exec -it nginx -- bash
error: unable to upgrade connection: pod does not exist
# 查看pod所在节点
[root@pool1 ~]# kubectl get pod nginx -o wide
NAME          READY   STATUS    RESTARTS   AGE   IP              NODE    NOMINATED NODE   READINESS GATES
nginx         1/1     Running   0          47m   10.244.52.193   pool2   <none>           <none>
# 进入pool2节点
[root@pool1 ~]# ssh pool2
[root@pool2 ~]# systemctl restart kubelet
[root@pool2 ~]# systemctl status kubelet
● kubelet.service - kubelet: The Kubernetes Node Agent
   Loaded: loaded (/usr/lib/systemd/system/kubelet.service; enabled; vendor preset: disabled)
  Drop-In: /usr/lib/systemd/system/kubelet.service.d
           └─10-kubeadm.conf
   Active: active (running) since Thu 2021-11-04 11:10:15 CST; 14s ago
     Docs: https://kubernetes.io/docs/
 Main PID: 93609 (kubelet)
    Tasks: 12
   Memory: 44.7M
   CGroup: /system.slice/kubelet.service
           └─93609 /usr/bin/kubelet --bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubele...

Nov 04 11:10:22 pool2 kubelet[93609]: 2021-11-04 11:10:22.273 [INFO][93830] ipam.go 1123...l2"
Nov 04 11:10:22 pool2 kubelet[93609]: 2021-11-04 11:10:22.273 [INFO][93830] ipam.go 777:...l2"
Nov 04 11:10:22 pool2 kubelet[93609]: time="2021-11-04T11:10:22+08:00" level=info msg="R...76"
Nov 04 11:10:22 pool2 kubelet[93609]: 2021-11-04 11:10:22.273 [INFO][93830] ipam_plugin.go ...
Nov 04 11:10:22 pool2 kubelet[93609]: 2021-11-04 11:10:22.275 [INFO][93825] k8s.go 375: ...int
Nov 04 11:10:22 pool2 kubelet[93609]: 2021-11-04 11:10:22.275 [INFO][93825] k8s.go 376: ...h0"
Nov 04 11:10:22 pool2 kubelet[93609]: 2021-11-04 11:10:22.275 [INFO][93825] dataplane_li...h0"
Nov 04 11:10:22 pool2 kubelet[93609]: 2021-11-04 11:10:22.276 [INFO][93825] dataplane_li...h0"
Nov 04 11:10:22 pool2 kubelet[93609]: 2021-11-04 11:10:22.288 [INFO][93825] k8s.go 403: ...int
Nov 04 11:10:22 pool2 kubelet[93609]: 2021-11-04 11:10:22.294 [INFO][93825] k8s.go 477: ...h0"
Hint: Some lines were ellipsized, use -l to show in full.
# 尝试登录pod
[root@pool1 ~]# kubectl exec -i -t nginx -- sh
Error from server: error dialing backend: dial tcp 172.16.1.21:10250: connect: connection refused
# 稍等两分钟
# 再次进入pod
[root@pool1 ~]# kubectl exec -i -t nginx -- sh
sh-4.2# 
sh-4.2# 
sh-4.2# 
sh-4.2# 
sh-4.2# exit
exit