Configure Static IP Address On CentOS


Terminal-icon-150x150A common question when allowing your website to be available on Internet is “How do I configure the Internet Protocol version 4 (IPv4) properties of a network connection with a static IP address for servers running Linux operating systems?”. This article will show how to do it.

Log on as root, change directory to /etc/sysconfig/network-scripts and list all available devices with the following command

# cd /etc/sysconfig/network-scripts
# ls -la | grep ifcfg-

Sample outputs

-rw-r--r--  3 root root   244 Mar 11  2013 ifcfg-eth0
-rw-r--r--  3 root root   141 Mar 11  2013 ifcfg-eth1
-rw-r--r--  1 root root   254 Mar 11  2013 ifcfg-lo

Find the configuration file corresponding to the NIC for which you want to set a static IP and edit it. In this example I’ll configure a static IP address for eth1 and use the following Internet Protocol Version 4:

# IP address: 192.168.1.10
# Netmask: 255.255.255.0
# Gateway IP: 192.168.1.1
# DNS Server IP # 2: 8.8.8.8
# DNS Server IP # 2: 8.8.4.4
# vi ifcfg-eth0

Sample output

DEVICE="eth0"
BOOTPROTO="dhcp"
HWADDR="FE:4A:B4:DF:5C:88"
NM_CONTROLLED="yes"
ONBOOT="yes"
TYPE="Ethernet"
UUID="7560d29c-70b8-4f22-b0f5-2e8f77298ba8"

Now set the parameters below according to your settings, sample static ip configuration

DEVICE="eth0"
BOOTPROTO="static"
HWADDR="FE:4A:B4:DF:5C:88"
IPADDR=76.164.193.12
NETMASK=255.255.255.248
NM_CONTROLLED="yes"
ONBOOT="no"
TYPE="Ethernet"
UUID="7560d29c-70b8-4f22-b0f5-2e8f77298ba8"

To setup DNS servers, edit /etc/resolv.conf, enter

# vi /etc/resolv.conf

Sample configurations

nameserver 8.8.8.8
nameserver 8.8.4.4

Now save the configuration file and exit the text editor. To apply changes, we need to bring the network interface down and back up, type the following command

# /etc/init.d/network restart

or

# service network restart

Troubleshooting

  • Sometimes we forgot to setup gateway. Remember to edit etc/sysconfig/network file to add 
    GATEWAY=YOUR_GATEWAY_IP

About NhocConan

A super lazy guy who tries to write tech blog entries in English.He is lazy, so he can only write when he is in a good mood or when he is tired of coding.

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