Required periodic maintenance

This document describes periodic maintenance that is required for your Google Distributed Cloud clusters.

Rotate certificate authorities

The certificate authorities (CAs) in a cluster are valid for five years, so you must rotate your CAs at least once every five years.

Certificates for cluster components

Cluster components use certificates for authentication. These components include kube-apiserver, kube-controller-manager, kube-scheduler, etcd and kubelet. The certificates are valid for one year and are renewed during cluster upgrade. To prevent the certificates from expiring, you must upgrade your cluster at least once a year.

If the cluster certificates have expired, they must be renewed manually. For more information, see Certificate expiration.