To disable the Network Manager service, perform the following steps:

1.) Disable Network Manager with the following commands:

Disable NetworkManager on CentOS 6, CloudLinux 6, Red Hat Enterprise Linux 6 (RHEL),

service NetworkManager stop   

chkconfig NetworkManager off

Disable NetworkManager on CentOS 7, CloudLinux 7,

systemctl stop NetworkManager.service

systemctl disable NetworkManager.service

2.) Change to the /etc/sysconfig/network-scripts directory.  Open each configuration file with your preferred text editor and set the following keys’ values:

NM_CONTROLLED=no 

ONBOOT=yes

3.) Run the following commands to restart the network:      

Restart the network on CentOS 6, CloudLinux 6, RHEL 6

chkconfig network on

service network start

Restart the network on CentOS 7, CloudLinux 7, or RHEL 7

systemctl enablenetwork.service 

systemctl start network.service

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