ubuntu 解决 Temporary failure in name resolution

举个例子，ping hub.docker.com不通

提示ping: hub.docker.com: Temporary failure in name resolution

查看/etc/resolv.conf

sudo vim /etc/resolv.conf

发现只有本机的172.x.x.x

进入输入模式，多加几个DNS

nameserver 8.8.8.8
nameserver 8.8.4.4
nameserver 114.114.114.114

保存退出

重启DNS resolver service

sudo systemctl restart systemd-resolved.service

再ping就通了