Procedure to Cordon or Drain a Single Master Node Cluster for Maintenance Purpose?

Problem

There's a single master cluster and there's a need to update the kernel. Can the master node be cordoned or drained?

Environment

• Platform9 Managed Kubernetes - All Versions

Answer

For the single master node, if cordon/drain is performed on master and then proceeded to update the kernel and/or reboot it, during the process when the node gets rebooted and all services come back up, the cluster will not be accessible. Other than that, there should not be any issues.