How to add OpenShift 4 RHCOS Worker Nodes in UPI in new installations (< 24 hours)

Solution Verified - Updated -

Issue

  • Installed OpenShift 4 on user provided infrastructure (UPI)
  • The documentation doesn't mention when or how to install new RHCOS Worker Nodes

NOTE this solution is intended for new installations (first 24 hours after deployment), otherwise check "Adding worker nodes to the OCP 4 UPI cluster existing 24+ hours"

Environment

  • Red Hat OpenShift Container Platform
    • 4.1, 4.2, 4.3
  • Red Hat Enterprise Linux CoreOS
    • 4.1, 4.2, 4.3

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