In a CentOS 7, we configuring a network interface using ifcfg files located in /etc/sysconfig/network-scripts/ directory, follow steps below and you will be good to go.

  1. Create a file named /etc/sysconfig/network-scripts/ifcfg-eth0

  2. Add following configuration into the file

    DEVICE=eth0
DEVICETYPE=EtherNet
BOOTPROTO=static
DEFROUTE=yes
NAME=eth0
ONBOOT=yes
IPADDR0=192.168.2.80
PREFIX0=24
GATEWAY0=192.168.2.1
DNS1=8.8.8.8
DNS2=8.8.4.4

  3. Restart network service: systemctl restart network