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

Solution Verified - Updated -


  • Red Hat OpenShift Container Platform 4.6.


  • Resizing of a control plane node is not supported as stated in Red Hat official documentation.
  • How more resources can be added to the master nodes without reinstalling the cluster ?


  • At the time when this article is being written (current major latest version: 4.6), resizing (shut down the master node, modify its memory and/or CPU and start up again) is only supported for clusters installed following Bare Metal User Provisioned Infrastructure
  • For clusters with any cloud provider integration configured, the only method currently supported is to remove and re-provision the master nodes one by one as explained on our official documentation.
  • 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.
  • There is an RFE requesting for master resizing (as explained on the first point) supportability on any cluster.
  • There is a documentation bug (BZ1842424) reporting the incompleteness of the sentence written here in this regard.

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