Ubuntu16 永久修改 DNS

环境： ubuntu16.04

操作步骤：

1、修改 /etc/resolv.conf

nameserver 114.114.114.114
nameserver 114.114.114.114
options timeout:1
options attempts:3

2、安装 resolveconf

apt install resolveconf

3、修改配置文件 /etc/resolvconf/resolv.conf.d/head

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 114.114.114.114
nameserver 114.114.114.114
options timeout:1
options attempts:3

4、执行更新

resolveconf -u

5、检查

cat /etc/resolv.conf