These instructions describe how to upgrade a Kubernetes cluster created using kubeadm on which an Oracle WebCenter Content domain is deployed. A rolling upgrade approach is used to upgrade nodes (master and worker) of the Kubernetes cluster.
It is expected that there will be a down time during the upgrade of the Kubernetes cluster as the nodes need to be drained as part of the upgrade process.
An upgrade of Kubernetes is supported from one MINOR version to the next MINOR version, or between PATCH versions of the same MINOR. For example, you can upgrade from 1.x to 1.x+1, but not from 1.x to 1.x+2. To upgrade a Kubernetes version, first all the master nodes of the Kubernetes cluster must be upgraded sequentially, followed by the sequential upgrade of each worker node.