Symptoms
After reboot, the contents of /etc/resolv.conf have changed or reverted to an old configuration.
Cause
NetworkManager can also control this behavior, and may need to be modified to prevent future recurrence.
Resolution
-
Modify the NetworkManager configuration:
/etc/NetworkManager/NetworkManager.conf
-
Locate the [main] section in that file, and add the following under it:
dns=none
rc-manager=unmanaged - Save the file, and the resolv.conf changes should persist after reboots going forward.
