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
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.