Caution: kubeadm alpha provides a preview of a set of features made available for gathering feedback from the community. Please try it out and give us feedback!  kubeadm alpha certs renew You can renew all Kubernetes certificates using the all subcommand or renew them selectively. For more details about certificate expiration and renewal see the certificate management documentation.
renew all admin.conf apiserver-etcd-client apiserver-kubelet-client apiserver controller-manager.conf etcd-healthcheck-client etcd-peer etcd-server front-proxy-client scheduler.