Version 1.13. This version is no longer supported. For information about how to upgrade to version 1.14, seeUpgrading Anthos on bare metalin the 1.14 documentation. For more information about supported and unsupported versions, see theVersion historypage in the latest documentation.
This document describes periodic maintenance that is required for your
GKE Enterprise clusters on bare metal.
Rotate certificate authorities
The certificate authorities (CAs) in a cluster are valid for five years, so you
mustrotate your CAsat 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 1 year and are renewed during clusterupgrade.
To prevent the certificates from expiring, you must upgrade your cluster at
least once a year.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-09-04 UTC."],[[["\u003cp\u003eThis document outlines the periodic maintenance necessary for GKE Enterprise clusters on bare metal.\u003c/p\u003e\n"],["\u003cp\u003eCertificate authorities (CAs) in the cluster have a five-year validity, requiring rotation at least once every five years.\u003c/p\u003e\n"],["\u003cp\u003eCluster components utilize certificates for authentication, which are valid for one year.\u003c/p\u003e\n"],["\u003cp\u003eCluster upgrades renew the component certificates, and must be performed at least once per year.\u003c/p\u003e\n"]]],[],null,["# Required periodic maintenance\n\n\u003cbr /\u003e\n\nThis document describes periodic maintenance that is required for your\nGKE Enterprise clusters on bare metal.\n\nRotate certificate authorities\n------------------------------\n\nThe certificate authorities (CAs) in a cluster are valid for five years, so you\nmust\n[rotate your CAs](/anthos/clusters/docs/bare-metal/1.13/how-to/ca-rotation)\nat least once every five years.\n\nCertificates for cluster components\n-----------------------------------\n\nCluster components use certificates for authentication. These components\ninclude kube-apiserver, kube-controller-manager, kube-scheduler, etcd and\nkubelet. The certificates are valid for 1 year and are renewed during cluster\n[upgrade](/anthos/clusters/docs/bare-metal/1.13/how-to/upgrade).\nTo prevent the certificates from expiring, you must upgrade your cluster at\nleast once a year."]]
