1. dmesg | grep eth查看网卡信息，有时eth0会被改成eth1，如果改成eth1，则下面的配置中有eth0的地方要做相应调整

2. sudo vim /etc/network/interfaces

auto eth0

iface eth0 inet static #dhcp或static

address 192.168.7.2

netmask 255.255.255.0

gateway 192.168.7.1

3. sudo vim /etc/resolvconf/resolv.conf.d/base

nameserver 192.168.7.1 #网关

nameserver 114.114.114.114 #DNS

然后/etc/init.d/networking restart重启服务器即可。