DNS resolution issues when nodes are restarted on OCP 4

Solution Verified - Updated -

Issue

  • During OCP updates, java.net.UnknownHostException intermitent errors are reported in OCP 4.
  • Problems with DNS during OpenShift 4 upgrade or nodes reboot.
  • Prefer local dns does not work as expected on OCP 4.

Environment

  • Red Hat OpenShift Container Platform (RHOCP)
    • 4

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