有點時候，比如像我們單位，沒事干就停一次網，結果ip變了，還得重新看ip，重新配置，很麻煩，所以干脆把自己ip固定，以不變應萬變！！！
1.首先查看自己的ip是什么：
$ ifconfig eno1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 172.16.13.196 netmask 255.255.255.0 broadcast 172.16.13.* inet6 fe80::f3ec:2efd:b99a:* prefixlen 64 scopeid 0x20<link> ether 4c:cc:6a:*:*:* txqueuelen 1000 (Ethernet) RX packets 3579688 bytes 1315908957 (1.2 GiB) RX errors 0 dropped 53 overruns 0 frame 0 TX packets 959049 bytes 160239316 (152.8 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 device interrupt 16 memory 0xdf100000-df120000 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 1000 (Local Loopback) RX packets 50192 bytes 17673476 (16.8 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 50192 bytes 17673476 (16.8 MiB) 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:e7:f2:e5 txqueuelen 1000 (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
發現有三個網卡設備，其中eno1是我們的有線網卡，ip地址是172.16.13.196，netmask是255.255.255.0；
2.另一方面查看gateway和DNS是什么：
Gateway:
$ netstat -rn Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface 0.0.0.0 172.16.*.* 0.0.0.0 UG 0 0 0 eno1 172.16.13.0 0.0.0.0 255.255.255.0 U 0 0 0 eno1 192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0
gateway為172.16.*.*
DNS:
$ cat /etc/resolv.conf # Generated by NetworkManager nameserver 159.226.*.*
DNS為159.226.*.*
3.得到需要的信息后，更改網絡配置文件：
vim /etc/sysconfig/network-scripts/ifcfg-eno1
在最后加上下面這幾句話：
IPADDR=172.16.13.196 GATEWAY=172.16.13.254 NETMASK=255.255.255.0 DNS1=159.226.8.6
同時把 BOOTPROTO="dhcp" 變更為 BOOTPROTO="static"
4.重啟網絡：
service network restart
Restarting network (via systemctl): [ OK ]
完成！