Ubuntu设置DNS永久生效

　　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