Centos 7 Network Configuration
After installation Centos 7 on your dedicated servers or VPS hosting , may your server not able to connect to net or use yum update , this all because your server Ethernet interfaces are not enabled by default.
Network configuration on Centos 7
Here two easy way for setup your network configuration on Centos machine
1- use “nmcli d” command by Putty at your ssh command line to quick list ethernet card installed on your machine

Centos 7 network setup
after that type “nmtui” command in your terminal to open Network manager. by opening Network manager chose “Edit connection” and press Enter (Use TAB button for choosing options). and select your network interface and click EDIT
DHCP configuration
change your IPv4 configuration to manual and put your IP full detail as IP address , subnet and …
2- Configuration from commend line
Go to the /etc/sysconfig/network-scripts directory, and locate its configuration file as (ifcfg-enp0s3) or maybe ifcfg-eth0 or something similar to this . Create it if not found
Now start the editing said file
vi /etc/sysconfig/network-scripts/ifcfg-enp0s3
then check your entries should be something like this
HWADDR=08:00:27:6C:FF:91 TYPE=Ethernet BOOTPROTO=static DEFROUTE=yes PEERDNS=yes PEERROUTES=yes IPV4_FAILURE_FATAL=no IPADDR=192.168.0.88 GATEWAY=192.168.1.1 IPV6INIT=yes IPV6_AUTOCONF=yes IPV6_DEFROUTE=yes IPV6_PEERDNS=yes IPV6_PEERROUTES=yes IPV6_FAILURE_FATAL=no NAME=enp0s3 UUID=ea68db6e-461e-427d-b9a8-bfcf6e1a4fc6 ONBOOT=yes
now save it and close the file
3- after that we need check server default getaway configuration
vi /etc/sysconfig/network
NETWORKING=yes HOSTNAME=hostname GATEWAY=your IP gataway detail in the end restart your dedicated servers or VPS hosting network
/etc/init.d/network restart
for more detail see this video
very usefull
thanks
for same server need following setting too
Configure DNS Server
vi /etc/resolv.conf
add following line:
nameserver 8.8.8.8
nameserver 8.8.4.4
__________
note the nameserver digit for same datacenter maybe different