OpenShift 4 upgrade failed while pulling the image from mirror registry with error x509: certificate signed by unknown authority

Solution Unverified - Updated -

Issue

  • While pulling the image from mirror getting the below error:

    Mirrors also failed: [registry.example.com:5000/ocp4/openshift4@sha256:c8ace6f0bcb5dfb174626b7d189bc9f9f7ee51394a92d209b4b01896f8bcf66e: error pinging docker registry registry.example.com:5000: Get \\\"https://registry.example.com:5000/v2/\\\": x509: certificate signed by unknown authority (possibly because of \\\"crypto/rsa: verification error\\\" while trying to verify candidate authority certificate \\\"registry.example.com\\\")]):

Environment

  • Red Hat OpenShift Container Platform (RHOCP)
    • 4
  • Disconnected cluster
  • Mirror registry

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