Upgrade a Kubernetes cluster on RHEL

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This article will show how to upgrade a kubernetes cluster

Check latest available version

Check latest available version

yum list --showduplicates kubeadm --disableexcludes=kubernetes

Example output

kubeadm.x86_64                                                                         1.22.1-0                                                                          kubernetes 
kubeadm.x86_64                                                                         1.22.2-0                                                                          kubernetes 
kubeadm.x86_64                                                                         1.22.3-0                                                                          kubernetes 
kubeadm.x86_64                                                                         1.22.4-0                                                                          kubernetes 
kubeadm.x86_64                                                                         1.22.5-0                                                                          kubernetes 
kubeadm.x86_64                                                                         1.22.6-0                                                                          kubernetes 
kubeadm.x86_64                                                                         1.22.7-0                                                                          kubernetes 
kubeadm.x86_64                                                                         1.22.8-0                                                                          kubernetes 
kubeadm.x86_64                                                                         1.22.9-0                                                                          kubernetes 
kubeadm.x86_64                                                                         1.22.10-0                                                                         kubernetes 
kubeadm.x86_64                                                                         1.22.11-0                                                                         kubernetes 
kubeadm.x86_64                                                                         1.22.12-0                                                                         kubernetes 
kubeadm.x86_64                                                                         1.23.0-0                                                                          kubernetes 
kubeadm.x86_64                                                                         1.23.1-0                                                                          kubernetes

Upgrade kubeadm

Select a version to upgrade :kubeadm-1.23.x-0

yum install -y kubeadm-1.23.x-0 --disableexcludes=kubernetes

Check current kubeadm version

kubeadm version

Check upgrade plan

kubeadm upgrade plan --ignore-preflight-errors=CoreDNSUnsupportedPlugins,CoreDNSMigration

Apply upgrade

kubeadm upgrade apply v1.23.9 --ignore-preflight-errors=CoreDNSUnsupportedPlugins,CoreDNSMigration

Upgrade kubelet and kubectl

Replace x in 1.23.x-0 with the latest patch version

yum install -y kubelet-1.23.x-0 kubectl-1.23.x-0 --disableexcludes=kubernetes

Restart the kubelet:

sudo systemctl daemon-reload
sudo systemctl restart kubelet

Verify status of cluster

# verify
kubectl get nodes
# Output
NAME    STATUS   ROLES                  AGE    VERSION
rhel8   Ready    control-plane,master   281d   v1.23.9

Reference :

https://v1-23.docs.kubernetes.io/docs/tasks/administer-cluster/kubeadm/kubeadm-upgrade/

https://v1-26.docs.kubernetes.io/docs/tasks/administer-cluster/kubeadm/kubeadm-upgrade/

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