Ubuntu20.04 系统中设置dns并生效

修改 /etc/systemd/resolved.conf 文件，在其中添加dns信息

DNS=2001:4860:4860::8888 2001:4860:4860::8844
DNS=8.8.8.8 114.114.114.114

然后退出保存。

然后以root身份在ubuntu终端中依次执行如下命令：

systemctl restart systemd-resolved

systemctl enable systemd-resolved

mv /etc/resolv.conf /etc/resolv.conf.bak

ln -s /run/systemd/resolve/resolv.conf /etc/