How to Configure Static IP Address on RHEL 7.0/CentOS 7.0/Oracle Linux 7

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This article will describe the procedure to configure static Ip address on RHEL 7/CentOS 7/Oracle Linux 7 minimal installation. Network interface configuration files control the software interfaces for individual network devices. As the system boots, it uses these files to determine what interfaces to bring up and how to configure them. These files are usually named ifcfg-name. Since the release of RHEL 7, redhat come with the new naming scheme for the network devices. In RHEL7/CentOS7/Oracle Linux 7, the default network interface name is based on firmware, topology, and location information. In this procedure, the network interface name is ifcfg-ens160.

1. Original ip configuration :

# cat /etc/sysconfig/network-scripts/ifcfg-ens160
HWADDR=00:02:22:G4:EE:FF
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=ens160
UUID=34796933-af4b-4a41-8287-6e57ac131234
ONBOOT=no

2. Please change BOOTPROTO to static or none, ONBOOT statement is set on YES and don’t change HWADDR and UUID values provided by default. Please add IPADDR, NETMASK, GATEWAY and DNS1 line as below :

HWADDR=00:02:22:G4:EE:FF
TYPE=Ethernet
BOOTPROTO=none
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=ens160
UUID=34796933-af4b-4a41-8287-6e57ac131234
ONBOOT=yes
IPADDR=192.168.0.70
NETMASK=255.255.255.0
GATEWAY=192.168.0.1
DNS1=8.8.8.8

3. Restart network interface to take effect :

# systemctl restart network

or

# service network restart
Restarting network (via systemctl):                        [  OK  ]

4. Run ifconfig to display the ip address. If your ifconfig command is not found, please follow this instruction to install it.(How to Install ifconfig and netstat on RHEL 7.0/CentOS 7.0):

# ifconfig
ens160: flags=4163  mtu 1500
        inet 192.168.0.70  netmask 255.255.255.0  broadcast 192.168.0.255
        inet6 fe80::20c:29ff:feba:3efe  prefixlen 64  scopeid 0x20
        ether 00:0c:29:ba:3e:fe  txqueuelen 1000  (Ethernet)
        RX packets 20775  bytes 1455662 (1.3 MiB)
        RX errors 0  dropped 40  overruns 0  frame 0
        TX packets 1289  bytes 179594 (175.3 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10
        loop  txqueuelen 0  (Local Loopback)
        RX packets 8  bytes 656 (656.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 8  bytes 656 (656.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

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