1、编辑 ifcfg-eth0 文件，vim 最小化安装时没有被安装，需要自行安装不描述。
# vim /etc/sysconfig/network-scripts/ifcfg-eth0
2、修改如下内容
BOOTPROTO=”static” #dhcp改为static
ONBOOT=”yes” #开机启用本配置
IPADDR=103.155.122.106 #静态IP
GATEWAY=103.155.122.1 #默认网关
NETMASK=255.255.255.0 #子网掩码
DNS1=8.8.8.8 #DNS 配置
3、修改后效果
# cat /etc/sysconfig/network-scripts/ifcfg-eth0
HWADDR=”00:15:5D:07:F1:02″
TYPE=”Ethernet”
BOOTPROTO=”static” #dhcp改为static
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=”eth0″
UUID=”bb3a302d-dc46-461a-881e-d46cafd0eb71″
ONBOOT=”yes” #开机启用本配置
IPADDR=103.155.122.106 #静态IP
GATEWAY=103.155.122.1 #默认网关
NETMASK=255.255.255.0 #子网掩码
DNS1=8.8.8.8 #DNS 配置
4、重启下网络服务
# service network restart
5、查看改动后的效果，Centois 7 不再使用 ifconfig 而是用 ip 命令查看网络信息。
# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
link/ether 00:15:5d:00:11:02 brd ff:ff:ff:ff:ff:ff
inet 192.168.7.106/24 brd 192.168.7.255 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::218:5dff:fe09:f202/64 scope link
valid_lft forever preferred_lft forever