CentOS 7 - Configure Static IP

In order to set a static IP, open /etc/sysconfig/network-scripts/ifcfg-[interface name] in your favourite editor. You should see contents similar to below.

TYPE=Ethernet
BOOTPROTO=dhcp
DEFROUTE=yes
PEERDNS=yes
PEERROUTES=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
IPV6_FAILURE_FATAL=no
NAME=enp0s3
UUID=6be86097-6e4f-455e-a3c6-02fbcbae3395
DEVICE=enp0s3
ONBOOT=yes

Change BOOTPROTO to static, and add the following items underneath it.

IPADDR=(IP address)
NETMASK=(netmask)
GATEWAY=(IP of gateway)
DNS1=(IP of DNS server)

You can add DNS2 as a backup DNS if you desire.

Your file should now look something like below:

TYPE=Ethernet
BOOTPROTO=static
IPADDR=192.168.1.45
NETMASK=255.255.0.0
GATEWAY=192.168.1.1
DNS1=192.168.1.2
NM_CONTROLLED=no
DEFROUTE=yes
PEERDNS=yes
PEERROUTES=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
IPV6_FAILURE_FATAL=no
NAME=enp0s3
UUID=6be86097-6e4f-455e-a3c6-02fbcbae3395
DEVICE=enp0s3
ONBOOT=yes

After making the change, you will need to restart the network service for it to apply:

sudo systemctl restart network.service

References

• Nixcraft - CentOS / RHEL 7 Restart / Stop / Start Networking Command
• Ask Xmodulo - How to configure a static IP address on CentOS 7