This simply needs to be said ... Networkmanager must be neutered

It should never, ever be enabled by a default install on a server. Ever. Under any circumstances. For any reason. I’d even argue it should never be installed by default for any reason on a server. Just fixed another NetworkManager-caused problem (TM). Modifying /etc/resolv.conf on a server after I changed the NICs as indicated. I mean … seriously folks?