CentOS7.2设置静态IP

　　首先将源文件进行备份：

 [zgw@localhost 桌面]$ sudo cp /etc/sysconfig/network-scripts/ifcfg-eno16777736 /etc/sysconfig/network-scripts/ifcfg-eno16777736.bak.zgw
 [sudo] password for zgw:

　　编辑配置文件：

 [zgw@localhost 桌面]$ sudo vi /etc/sysconfig/network-scripts/ifcfg-eno16777736

　　打开后如下所示：

 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=eno16777736
 UUID=00c21c9b-6e66---4b1bd2fdcf07
 DEVICE=eno16777736
 ONBOOT=no

　　修改后如下：

 TYPE=Ethernet
 BOOTPROTO=static
 DEFROUTE=yes
 PEERDNS=yes
 PEERROUTES=yes
 IPV4_FAILURE_FATAL=no
 IPV6INIT=no
 IPV6_AUTOCONF=yes
 IPV6_DEFROUTE=yes
 IPV6_PEERDNS=yes
 IPV6_PEERROUTES=yes
 IPV6_FAILURE_FATAL=no
 NAME=eno16777736
 UUID=00c21c9b-6e66---4b1bd2fdcf07
 DEVICE=eno16777736
 ONBOOT=yes
 IPADDR=192.168.89.11　　#IP
 NATMASK=255.255.255.0　　#网关
 GATEWAY=192.168.89.2　　#子网掩码
 DNS1=1.2.4.8　　#DNS

　　常用的DNS地址：http://www.cnblogs.com/boyzgw/p/6651234.html

　　修改完成之后重启网卡服务：

 [zgw@localhost 桌面]$ /etc/init.d/network restart
 Restarting network (via systemctl): [ 确定 ]

　　查看并测试：

 [zgw@localhost 桌面]$ ip addr
 : lo: <LOOPBACK,UP,LOWER_UP> mtu  qdisc noqueue state UNKNOWN
 link/loopback ::::: brd :::::
 inet 127.0.0.1/ scope host lo
 valid_lft forever preferred_lft forever
 inet6 ::/ scope host
 valid_lft forever preferred_lft forever
 : eno16777736: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu  qdisc pfifo_fast state UP qlen
 link/ether :0c::1e::ed brd ff:ff:ff:ff:ff:ff
 inet 192.168.89.11/ brd 192.168.89.255 scope global eno16777736
 valid_lft forever preferred_lft forever
 inet6 fe80::20c:29ff:fe1e:41ed/ scope link
 valid_lft forever preferred_lft forever
 : virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu  qdisc noqueue state DOWN
 link/ether ::::: brd ff:ff:ff:ff:ff:ff
 inet 192.168.122.1/ brd 192.168.122.255 scope global virbr0
 valid_lft forever preferred_lft forever
 : virbr0-nic: <BROADCAST,MULTICAST> mtu  qdisc pfifo_fast master virbr0 state DOWN qlen
 link/ether ::::: brd ff:ff:ff:ff:ff:ff
 [zgw@localhost 桌面]$ ping www.baidu.com
 PING www.a.shifen.com (220.181.111.188) () bytes of data.
  bytes from 220.181.111.188: icmp_seq= ttl= time=59.1 ms
  bytes from 220.181.111.188: icmp_seq= ttl= time=54.3 ms
  bytes from 220.181.111.188: icmp_seq= ttl= time=72.5 ms
 ^C64 bytes from 220.181.111.188: icmp_seq= ttl= time= ms

 --- www.a.shifen.com ping statistics ---
  packets transmitted,  received, % packet loss, time 30207ms
 rtt min/avg/max/mdev = 54.341/85.961/157.819/42.021 ms
 [zgw@localhost 桌面]$ ping www.hao123.com #万一百度打盹儿了呢
 PING hao123.n.shifen.com (180.149.132.3) () bytes of data.
  bytes from 180.149.132.3: icmp_seq= ttl= time=60.9 ms
  bytes from 180.149.132.3: icmp_seq= ttl= time=43.4 ms
 ^C64 bytes from 180.149.132.3: icmp_seq= ttl= time= ms

 --- hao123.n.shifen.com ping statistics ---
  packets transmitted,  received, % packet loss, time 20137ms
 rtt min/avg/max/mdev = 43.477/90.098/165.833/54.027 ms
 [zgw@localhost 桌面]$