How to start Red Hat CoreOS (RHCOS) in emergency mode in OpenShift 4

Solution Verified - Updated -

Issue

  • Due to a network miss-configuration the machine may not be reachable through SSH.
  • There is no default password set to log in on the console.
  • Is it possible to use coreos.autologin kernel command-line argument in CoreOS?
  • How to use rd.break to access RHCOS OpenShift Container Platform 4 nodes.
  • How to access emergency mode in RHCOS OpenShift Container Platform 4.
  • How to use rd.break to access RHCOS OpenShift Container Platform 4 nodes to repair filesystems.

Environment

  • Red Hat OpenShift Container Platform (RHOCP)
    • 4
  • Red Hat Enterprise Linux CoreOS (RHCOS)
    • 4

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