- https://discuss.kubernetes.io/t/unable-to-connect-to-the-server-x509-certificate-has-expired-or-is-not-yet-valid/16484
- https://stackoverflow.com/a/57308826
- kubernetes/kubeadm#581
- kubernetes/kubeadm#1361
Execute as root!
/usr/local/bin/kubeadm alpha certs check-expiration
/usr/local/bin/kubeadm alpha certs renew all