How to Configure a Static IP address on CentOS/RHEL 7

This post explains how a static IP address can be set on CentOS/RHEL 7. We can configure the static ip address in /etc/sysconfig/network-scripts/* by setting the properties in the /etc/sysconfig/network-scripts/ifcfg-[interface] file. Here [interface] is the interface of your choice to which you want to assign an IP address.

Sample Example

Below are basic configuration instructions to setup a static IP address on CentOS/RHEL 7.

1. First, list your network interfaces with ip command:

# ip add show

Make a note of network interface you would like to set with static IP address.

2. Next, locate a corresponding script to the network interface name. In our case this is enp0s3 located at /etc/sysconfig/network-scripts/ifcfg-enp0s3.

3. Open this file and enter the following information. Note that your HWADDR,DEVICE,UUID will be different:

# vi /etc/sysconfig/network-scripts/ifcfg-enp0s3

4. The above will set our enp0s3 network interface with static IP address 10.1.XX.110. Once you have made the necessary changes restart the system networking using below command:

# systemctl restart network

5. Confirm that your IP address has been updated:

# ip addr show
1: lo: mtu 65536 qdisc noqueue state UNKNOWN
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet scope host lo
  valid_lft forever preferred_lft forever
  inet6 ::1/128 scope host
  valid_lft forever preferred_lft forever
2: enp0s3: mtu 1500 qdisc pfifo_fast state UP qlen 1000
  link/ether <mac> brd ff:ff:ff:ff:ff:ff
  inet 10.1.XX.110/8 brd 10.255.XX.255 scope global enp0s3
  valid_lft forever preferred_lft forever
  inet6 fe80::a00:27ff:fe15:38b7/64 scope link
  valid_lft forever preferred_lft forever</mac>