How to make persistent changes to the /etc/resolv.conf?

Solution Verified - Updated -

Issue

  • DNS servers in /etc/resolv.conf change after a reboot or network service restart
  • resolv.conf gets overwritten
  • Why entries in /etc/resolv.conf clears after system reboot?
  • How to make permanent changes to the /etc/resolv.conf?
  • Reboot removes or changes entries in /etc/resolv.conf

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • initscripts

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