K8S 证书过期的解决方法_stopped kubelet: the kubernetes node agent.

K8S 证书过期的解决方法

2年前用虚拟机做K8S集群学习。最近打开当时的虚拟机，发现K8S无法启动。

The connection to the server xxxx:6443 was refused - did you specify the right host or port?
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1.诊断

查看日志 sudo journalctl -xefu kubelet，发现报错“bootstrap-kubelet.conf: no such file or directory”，并提示证书过期。

Oct 11 23:55:51 master.k8s systemd[1]: kubelet.service failed.
Oct 11 23:56:01 master.k8s systemd[1]: kubelet.service holdoff time over, scheduling restart.
Oct 11 23:56:01 master.k8s systemd[1]: Stopped kubelet: The Kubernetes Node Agent.
-- Subject: Unit kubelet.service has finished shutting down
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit kubelet.service has finished shutting down.
Oct 11 23:56:01 master.k8s systemd[1]: Started kubelet: The Kubernetes Node Agent.
-- Subject: Unit kubelet.service has finished start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit kubelet.service has finished starting up.
-- 
-- The start-up result is done.
Oct 11 23:56:01 master.k8s kubelet[2931]: I1011 23:56:01.532681    2931 server.go:411] Version: v1.19.4
Oct 11 23:56:01 master.k8s kubelet[2931]: I1011 23:56:01.533162    2931 server.go:831] Client rotation is on, will bootstrap in background
Oct 11 23:56:01 master.k8s kubelet[2931]: E1011 23:56:01.534673    2931 bootstrap.go:265] part of the existing bootstrap client certificate is expired: 2021-12-06 17:48:28 +0000 UTC
Oct 11 23:56:01 master.k8s kubelet[2931]: F1011 23:56:01.534777    2931 server.go:265] failed to run Kubelet: unable to load bootstrap kubeconfig: stat /etc/kubernetes/bootstrap-kubelet.conf: no such file or directory
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查看状态 systemctl status kubelet.service

[root@master kubernetes]# systemctl status kubelet.service 
● 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: activating (auto-restart) (Result: exit-code) since Wed 2022-10-12 00:26:38 CST; 7s ago
     Docs: https://kubernetes.io/docs/
  Process: 6437 ExecStart=/usr/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_KUBEADM_ARGS $KUBELET_EXTRA_ARGS (code=exited, status=255)
 Main PID: 6437 (code=exited, status=255)

Oct 12 00:26:38 master.k8s kubelet[6437]: k8s.io/kubernetes/vendor/k8s.io/apimachinery/pkg/util/wait.Forever(...f200)
Oct 12 00:26:38 master.k8s systemd[1]: kubelet.service failed.
Hint: Some lines were el
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