How to remove worker role from control plane in OpenShift 4?

Solution Verified - Updated -

Issue

  • On bare metal installations, master nodes feature both master and worker roles.
  • How to remove worker role from master in Red Hat OpenShift Container Platform 4?
  • Not able to apply taint on master nodes due to which application pods are getting scheduled on master nodes.
  • How to taint control plane nodes so that application pods are always scheduled on worker nodes?

  • The worker role is shown also for control plane nodes:

    master-0.example.com   Ready    control-plane,master,worker   6d   v1.26.5+0001a21
master-1.example.com   Ready    control-plane,master,worker   6d   v1.26.5+0001a21
master-2.example.com   Ready    control-plane,master,worker   6d   v1.26.5+0001a21

Environment

  • Red Hat OpenShift Container Platform (RHOCP)
    • 4
  • Control Plane Schedulable

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