How to remove a worker node from Red Hat OpenShift Container Platform 4 UPI?

Solution Verified - Updated -

Issue

  • How to remove a worker node from an UPI installation of Red Hat OpenShift Container Platform 4?
  • Documentation explains only how to scale down a MachineSet but a baremetal or any other UPI installed cluster lacks of MachineSets.
  • How to recover a worker node that has been deleted?

Environment

  • Red Hat OpenShift Container Platform 4
  • UPI installation

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