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Step 1: Type the following command to access your system’s network configuration file. We will be using ethernet port eth0.

vi /etc/sysconfig/network-scripts/ifcfg-eth0

Step 2: Here you can configure it as you like, as an example though we are going to configure it into a server with static IP. Press “i” to enter Insert Mode and perform the following changes.

• BOOTPROTO=static
• ONBOOT=yes

  Add in the following lines:

• IPADDR=<your-ip-address>
• NETMASK=<your-network-mask>

  
  Press Esc and then type “:wq” to save and exit the network configuration file.

Step 3: Type the following command to edit your network gateway.

vi /etc/sysconfig/network

Then add in the following line: GATEWAY=<your-gateway>

Press Esc and then type “:wq” to save and exit the network configuration file.

Step 4: Add in DNS by typing the following command:

vi /etc/resolv.conf

Then add in the following lines to use Google DNS:

nameserver 8.8.8.8
nameserver 8.8.4.4

Press Esc and then type “:wq” to save and exit the network configuration file.

Note: To check your network configuration on CentOS 7, use the following command:

ip addr

This is because the previously used command “ifconfig” has become obsolete as of this version of CentOS.

Step 5: Type in the following commands to start your network settings.

service network start
ifup eth0

Try pinging any available sites (eg. google.com), if the connection works then the configuration is a success.

With the network now working, you can perform any updates of your CentOS with the command:

yum update