1. Check node is k8s master or worker kubectl get nodes kubectl get node pe-ioc-master03 -o=yaml 2. Check certificate expired: kubeadm certs check-expiration Note: https://kubernetes.io/docs/tasks/administer-cluster/kubeadm/kubeadm-certs/ Folder include configure (/etc/kubernetes/) and certificate file (/etc/kubernetes/pki) 3. Check kubeadm version kubeadm version 4. Restart the kubelet: sudo systemctl daemon-reload sudo systemctl restart kubelet 5. Renew Certificate on master node (run command for each node): kubeadm alpha certs renew all service docker restart
Think big, start small, move fast.