How to add additional search domains and nameserver parameters in OCP deployed on top of Red Hat Enterprise Linux 7.x?

Solution Verified - Updated -

Issue

  • How do one add DNS search domains in addition to cluster.local for OpenShift Container Platform 3.11 deployed on top of Red Hat Enterprise Linux 7.x ?
  • The additional search domains manually added to the file /etc/resolv.conf get missing whenever a new image is deployed.
  • The file /etc/resolv.conf continues to get overwritten in OpenShift cluster nodes when a new image is deployed.
  • How to add an additional nameserver value to /etc/resolv.conf file?

Environment

  • Red Hat OpenShift Container Platform
    • 3.11
  • Red Hat Enterprise Linux 7.x

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