Is it supported to modify the control plane node size in a running OpenShift Container Platform 4.x cluster?

Solution Verified - Updated -

Environment

  • Red Hat OpenShift Container Platform (RHOCP) 4

Issue

  • Is masters (control plane) resizing a supported day-2 operation?
  • How more resources can be added to the master nodes without reinstalling the cluster?

Resolution

At the time when this article is being written (current major latest version: 4.6), a rolling update resizing for the master nodes (shut down one of the master nodes, modify its memory and/or CPU and start up again) is possible if your infrastructure allows it.

Cautions:

  • Make sure that the rest of the masters are completely healthy before removing or shutting down one of them.
  • Removing or shutting down a master may be a risky operation in an overloaded or unhealthy cluster. You can open a support case if your cluster is in this situation, you have to increase the hardware of your master nodes and you need some guidance.

Looking forward:

This solution is part of Red Hat’s fast-track publication program, providing a huge library of solutions that Red Hat engineers have created while supporting our customers. To give you the knowledge you need the instant it becomes available, these articles may be presented in a raw and unedited form.