Resolv.conf
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Prevent DHCP client from changing resolv.conf file
This is the method that I recommend using the most. changing dhcp hooks
Edit /etc/dhcp/dhclient-enter-hooks.d/nodnsupdate.
vi /etc/dhcp/dhclient-enter-hooks.d/nodnsupdate
Make the following edits:
#!/bin/sh
make_resolv_conf(){
:
}
Save and exit.
Update the permissions on the nodnsupdate file.
chmod +x /etc/dhcp/dhclient-enter-hooks.d/nodnsupdate
Reboot your server. You can now update nameservers by editing /etc/resolv.conf without worrying about rollback.