K8s Master状态NotReady
[root@k8s-master01:7 /var/lib/kubelet/pki]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
k8s-master01.amngrvmm.dc01.scf Ready master 5y65d v1.17.6
k8s-master02.amngrvmm.dc01.scf NotReady master 5y65d v1.17.6
k8s-master03.amngrvmm.dc01.scf Ready master 5y65d v1.17.6
k8s-node01.amngrvmm.dc01.scf Ready <none> 5y65d v1.17.6
k8s-node02.amngrvmm.dc01.scf Ready <none> 608d v1.17.6
k8s-node03.amngrvmm.dc01.scf Ready <none> 608d v1.17.6
查看日志
[root@k8s-master02:4 ~]# journalctl -u kubelet -f
Aug 05 15:45:49 k8s-master02.amngrvmm.dc01.scf systemd[1]: kubelet.service: Service RestartSec=10s expired, scheduling restart.
Aug 05 15:45:49 k8s-master02.amngrvmm.dc01.scf systemd[1]: kubelet.service: Scheduled restart job, restart counter is at 52.
Aug 05 15:45:49 k8s-master02.amngrvmm.dc01.scf systemd[1]: Stopped kubelet: The Kubernetes Node Agent.
Aug 05 15:45:49 k8s-master02.amngrvmm.dc01.scf systemd[1]: Started kubelet: The Kubernetes Node Agent.
Aug 05 15:45:49 k8s-master02.amngrvmm.dc01.scf kubelet[2797]: Flag --cgroup-driver has been deprecated, This parameter should be set via the config file specified by the Kubelet's --config flag. See https:s.io/docs/tasks/administer-cluster/kubelet-config-file/ for more information.
Aug 05 15:45:49 k8s-master02.amngrvmm.dc01.scf kubelet[2797]: Flag --resolv-conf has been deprecated, This parameter should be set via the config file specified by the Kubelet's --config flag. See https://io/docs/tasks/administer-cluster/kubelet-config-file/ for more information.
Aug 05 15:45:49 k8s-master02.amngrvmm.dc01.scf kubelet[2797]: Flag --cgroup-driver has been deprecated, This parameter should be set via the config file specified by the Kubelet's --config flag. See https:s.io/docs/tasks/administer-cluster/kubelet-config-file/ for more information.
Aug 05 15:45:49 k8s-master02.amngrvmm.dc01.scf kubelet[2797]: Flag --resolv-conf has been deprecated, This parameter should be set via the config file specified by the Kubelet's --config flag. See https://io/docs/tasks/administer-cluster/kubelet-config-file/ for more information.
Aug 05 15:45:49 k8s-master02.amngrvmm.dc01.scf kubelet[2797]: I0805 15:45:49.724653 2797 server.go:416] Version: v1.17.6
Aug 05 15:45:49 k8s-master02.amngrvmm.dc01.scf kubelet[2797]: I0805 15:45:49.725245 2797 plugins.go:100] No cloud provider specified.
Aug 05 15:45:49 k8s-master02.amngrvmm.dc01.scf kubelet[2797]: I0805 15:45:49.725308 2797 server.go:821] Client rotation is on, will bootstrap in background
Aug 05 15:45:49 k8s-master02.amngrvmm.dc01.scf kubelet[2797]: E0805 15:45:49.730326 2797 bootstrap.go:265] part of the existing bootstrap client certificate is expired: 2024-12-05 07:11:30 +0000 UTC
Aug 05 15:45:49 k8s-master02.amngrvmm.dc01.scf kubelet[2797]: F0805 15:45:49.730409 2797 server.go:273] failed to run Kubelet: unable to load bootstrap kubeconfig: stat /etc/kubernetes/bootstrap-kubeletuch file or directory
Aug 05 15:45:49 k8s-master02.amngrvmm.dc01.scf systemd[1]: kubelet.service: Main process exited, code=exited, status=255/n/a
Aug 05 15:45:49 k8s-master02.amngrvmm.dc01.scf systemd[1]: kubelet.service: Failed with result 'exit-code'.
kubelet 客户端证书过期
进入 /var/lib/kubelet/pki文件夹查看，kubelet的证书还是老证书 kubelet-client-2024-08-19-08-12-55.pem
[root@k8s-master02:15 /var/lib/kubelet/pki]# ll
total 32
-rw------- 1 root root 1098 Jun 2 2020 kubelet-client-2020-06-02-11-23-02.pem
-rw------- 1 root root 1098 Apr 3 2021 kubelet-client-2021-04-03-00-58-46.pem
-rw------- 1 root root 1098 Dec 26 2021 kubelet-client-2021-12-26-17-48-17.pem
-rw------- 1 root root 1098 Oct 23 2022 kubelet-client-2022-10-23-20-49-54.pem
-rw------- 1 root root 1098 Dec 6 2023 kubelet-client-2023-12-06-15-15-55.pem
-rw------- 1 root root 1098 Aug 19 2024 kubelet-client-2024-08-19-08-12-55.pem
lrwxrwxrwx 1 root root 59 Aug 19 2024 kubelet-client-current.pem -> /var/lib/kubelet/pki/kubelet-client-2024-08-19-08-12-55.pem
-rw-r--r-- 1 root root 2315 Jun 2 2020 kubelet.crt
-rw------- 1 root root 1679 Jun 2 2020 kubelet.key
进入**/etc/kubernetes**文件夹
备份一下kubelet.conf
将kubelet.conf中的client-certificate 、client-key-data替换为admin.conf中的client-certificate-data、client-key-data
[root@k8s-master02:20 /etc/kubernetes]# ls
admin.conf controller-manager.conf kubelet.conf manifests pki scheduler.conf
[root@k8s-master02:21 /etc/kubernetes]# cp kubelet.conf kubelet.conf.back
[root@k8s-master02:22 /etc/kubernetes]# vim kubelet.conf
替换完成后，可以看到 /var/lib/kubelet/pki 文件夹下生成了新的kubelet-client证书kubelet-client-2025-08-05-15-57-18.pem
[root@k8s-master02:25 /var/lib/kubelet/pki]# ll
total 36
-rw------- 1 root root 1098 Jun 2 2020 kubelet-client-2020-06-02-11-23-02.pem
-rw------- 1 root root 1098 Apr 3 2021 kubelet-client-2021-04-03-00-58-46.pem
-rw------- 1 root root 1098 Dec 26 2021 kubelet-client-2021-12-26-17-48-17.pem
-rw------- 1 root root 1098 Oct 23 2022 kubelet-client-2022-10-23-20-49-54.pem
-rw------- 1 root root 1098 Dec 6 2023 kubelet-client-2023-12-06-15-15-55.pem
-rw------- 1 root root 1098 Aug 19 2024 kubelet-client-2024-08-19-08-12-55.pem
-rw------- 1 root root 1098 Aug 5 15:57 kubelet-client-2025-08-05-15-57-18.pem
lrwxrwxrwx 1 root root 59 Aug 5 15:57 kubelet-client-current.pem -> /var/lib/kubelet/pki/kubelet-client-2025-08-05-15-57-18.pem
-rw-r--r-- 1 root root 2315 Jun 2 2020 kubelet.crt
-rw------- 1 root root 1679 Jun 2 2020 kubelet.key
恢复kubelet.conf 中的原始配置，不恢复也可以正常使用
重启kubelet或者重启机器
再次查看master02状态 Ready，恢复正常
[root@k8s-master01:8 /var/lib/kubelet/pki]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
k8s-master01.amngrvmm.dc01.scf Ready master 5y65d v1.17.6
k8s-master02.amngrvmm.dc01.scf Ready master 5y65d v1.17.6
k8s-master03.amngrvmm.dc01.scf Ready master 5y65d v1.17.6
k8s-node01.amngrvmm.dc01.scf Ready <none> 5y65d v1.17.6
k8s-node02.amngrvmm.dc01.scf Ready <none> 608d v1.17.6
k8s-node03.amngrvmm.dc01.scf Ready <none> 608d v1.17.6