Auto Start Network Interface of cent os after reboot.

 When you are giving IP address in a cent os , By default that IP gets removed when the machine reboots. So you have to configure the on boot Yes to make it permanent .

1. Create a file named [root@localhost ~]# vi /etc/sysconfig/network-scripts/ifcfg-enp8s0 as follows:
   
   
2. DEVICE=eth0
3. BOOTPROTO=none
4. ONBOOT=yes
5. PREFIX=24
6. IPADDR=192.168.2.203
7. PREFIX=24
8. GATEWAY=192.168.2.1
9. DNS1=8.8.8.8
10. DNS2=4.2.2.2
11. Restart network service: systemctl restart network