How can I prevent NetworkManager from modifying the /etc/resolv.conf file?

Solution Verified - Updated -

Issue

  • NetworkManager modifies the resolv.conf file and any manual changes there are lost
  • How to prevent the /etc/resolv.conf file from being overwritten by NetworkManager?

Environment

  • Red Hat Enterprise Linux 9
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 7
  • NetworkManager

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