解决方案
去master上把admin.conf下的client-certificate-data和client-key-data拷贝到故障node节点的kubelet.conf中，然后重启故障节点的kubelet.
k8s node证书过期报错: part of the existing bootstrap client certificate in /etc/kubernetes/kubelet.conf is expired: 2023-04-29 02:49:48 +0000 UTC