Resize Control Plane node (Master Node) size in ROSA clusters

Solution Verified - Updated -

Environment

  • Red Hat OpenShift Service on AWS (ROSA)
    • 4

Issue

  • Is it possible to resize master node size in ROSA STS?
  • Is it possible to resize infra node size in ROSA clusters?
  • Can we increase the master node size to better support a large number of tenants (>600) in ROSA ?

Resolution

For resizing the Control Plane and/or Infra nodes node sizing, open a support case with Red Hat.

After reviewing the size of the cluster and the node details (and based on the node sizing documentation, the Red Hat SRE team will proceed with resizing the Control Plane/Infra nodes to the desired size.

Root Cause

During the installation process, the sizing of the control plane and infrastructure nodes are dynamically calculated. The sizing calculation is based on the number of compute nodes in a cluster. Refer to node sizing during installation for additional information.

Diagnostic Steps

Once control plane node resize it will show output similar as below:

$  oc get machines -n openshift-machine-api | grep master
abcd-x-xxx-xx-xxxxx-master-x                       Running   m5.8xlarge   us-east-x   us-east-xx   32d
abcd-x-xxx-xx-xxxxx-master-x                       Running   m5.8xlarge   us-east-x   us-east-xx   32d
abcd-x-xxx-xx-xxxxx-master-x                       Running   m5.8xlarge   us-east-x   us-east-xx   32d

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