To disable Network Manager on Ubuntu or Linux Mint:
$ sudo stop network-manager
$ echo "manual" | sudo tee etc init/network-manager.override
After disabling Network Manager on Debian or Ubuntu, use etc network/interfaces to configure network interfaces.
To disable Network Manager on Fedora or CentOS/RHEL 7 or later:
To disable Network Manager on CentOS/RHEL 6 or earlier:
$ sudo service NetworkManager stop
$ sudo chkconfig NetworkManager off
After disabling Network Manager on Fedora or CentOS, use etc sysconfig/network-scripts/ifcfg-ethX files to configure network interfaces.
After rebooting, verify that Network Manager is successfully disabled for eth1.