Preventing NetworkManager from overwriting /etc/resolv.conf

Because /etc/resolv.conf is managed by NetworkManager service, any manual changes to the file are overwritten when the network service is restarted. To prevent this, change the value of dns parameter to none in /etc/NetworkManager/NetworkManager.conf:

1. Edit /etc/resolv.conf file
2. Add dns=none under the [main] section in /etc/NetworkManager/NetworkManager.conf.
3. Restart the NetworkManager service

Reference

• Chapter 21. Manually configuring the /etc/resolv.conf file