系统版本 rhel7.2
1、首先ifconfig看一下我们的设备名字，我查到的是eno16777736，ip是192.168.1.7
[sam@yl 桌面]$ ifconfig
eno16777736: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.7 netmask 255.255.255.0 broadcast 192.168.1.255
inet6 fe80::20c:29ff:febc:1dfe prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:bc:1d:fe txqueuelen 1000 (Ethernet)
RX packets 52 bytes 9322 (9.1 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 91 bytes 10275 (10.0 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 0 (Local Loopback)
RX packets 4 bytes 340 (340.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 4 bytes 340 (340.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
virbr0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255
ether 52:54:00:4a:d0:88 txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
2、修改我们的配置文件（首先要确定有权限，我是直接su切换到root下修改的）：
[root@yl 桌面]# vim /etc/sysconfig/network-scripts/ifcfg-eno16777736
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="402edb11-e974-4fa5-95b1-1718af166586"
DEVICE="eno16777736"
ONBOOT="yes"
修改BOOTPROTO为static或者none，这俩都是指定ip为静态的。
然后在下面添加IP、子网掩码、网关、DNS
IPADDR=192.168.1.15
NETMASK=255.255.255.0
GATEWAY=192.168.1.1
DNS1=114.114.114.114
3、重启(三种方式总有一款适合你)：
1、service network restart
2、systemctl restart NetworkManager
3、先关闭再启动
ifdown eno16777736
ifup eno16777736
动态获取IP :
BOOTPROTO则改为dhcp
然后去掉IP、子网掩码、网关、DNS
