I ran into an error when installing Cpanel onto a Centos 7 vps, the error involved the Network manger conflicting thus not allowing the install to happen here’s how I fixed it:

systemctl stop NetworkManager

Stops the Network manager

systemctl disable NetworkManager

Disables the Network manager

Finally use

systemctl list-unit-files | grep NetworkManager

To check if Network manager has been disabled.

Thats the quick and easy way to disable Network manager on Centos.