环境查看
设置临时生效，修改配置文件/etc/resolv.conf
nameserver 202.96.134.133
重启失效
设置永久生效，修改网卡配置文件/etc/network/interfaces
重启网络
systemctl restart networking
PS：需要安装resolvconf
apt install resolvconf
Ubuntu设置DNS永久生效
原文：https://www.cnblogs.com/minseo/p/10223902.html
