Resize Control Plane node (Master Node) size to m5.4xlarge in ROSA STS

Solution Verified - Updated -

Environment

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

Issue

  • Is it possible to resize master node size in ROSA STS to m5.4xlarge
  • Can we increase the master node size to better support a large number of tenants (>600) in ROSA.

Resolution

  • Yes, it is possible to resize control plane node size to m5.4xlarge.
  • Open a support case with Red Hat.
  • After reviewing the node details, our SRE team will proceed with resizing the control plane node to the desired size.
  • 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.
  • Check the node sizing during the installation in ROSA.
  • 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   m5.4xlarge   us-east-x   us-east-xx   32d
abcd-x-xxx-xx-xxxxx-master-x                       Running   m5.4xlarge   us-east-x   us-east-xx   32d
abcd-x-xxx-xx-xxxxx-master-x                       Running   m5.4xlarge   us-east-x   us-east-xx   32d

Diagnostic Steps

  • Check the current size of master nodes:

Run below command:

$ oc get machines -n openshift-machines-api | grep master
abcd-x-xxx-xx-xxxxx-master-x                       Running   m5.2xlarge   us-east-x   us-east-xx   2d2h
abcd-x-xxx-xx-xxxxx-master-x                       Running   m5.2xlarge   us-east-x   us-east-xx   2d2h
appc-x-xxx-xx-xxxxx-master-x                       Running   m5.2xlarge   us-east-x   us-east-xx   2d2h

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