Upgrade

Read the kubernetes changes

Check the changes between releases

• Releases

https://kubernetes.io/releases/

• Blog

https://kubernetes.io/blog/

Read the documentation about upgrading process

• Upgrade A Cluster

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

• Upgrading kubeadm clusters

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

• Upgrading Linux nodes

https://kubernetes.io/docs/tasks/administer-cluster/kubeadm/upgrading-linux-nodes/

Compatibility

Check the compatibility between all your applications and the new kubernetes release. For example:

• CSI driver (cilium,...)
• CNI driver (vmware, nfs,..)

Check deprecated apis

Kubernetes apis can change between release

https://kubernetes.io/docs/reference/using-api/deprecation-guide/

Tools to check

• Silver Surfer

https://github.com/devtron-labs/silver-surfer>

• Pluto

https://github.com/FairwindsOps/pluto

• Kubepug

https://github.com/kubepug/kubepug