1. To disable the Network Manager service, perform the following steps:
Disable Network Manager with the following commands:
CentOS 6, CloudLinux 6, Red Hat Enterprise Linux 6 (RHEL), or Amazon Linux:
service NetworkManager stop chkconfig NetworkManager off
CentOS 7, CloudLinux 7, or RHEL 7:
systemctl stop NetworkManager systemctl disable NetworkManager
2. Change to the /etc/sysconfig/network-scripts directory.
3. Open the ifcfg-eth0 and ifcfg-lo files with your preferred text editor and, if they exist, set the following keys’