【Linux Ubuntu】Resolving failed:

问题描述：Ubuntu想添加Docker官方的GPG密钥，命令输完无响应

$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

测试网络，无问题

$ ping www.baidu.com
64 bytes from 183.232.231.172: icmp_seq=1 ttl=55 time=55.2 ms

单独输入，报错 Resolving failed: Temporary failure in name resolution，发现是DNS解析异常

$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg
Resolving failed: Temporary failure in name resolution

查看resolv.conf配置的DNS，无此文件可以新建

$ cat /etc/resolv.conf
nameserver 192.168.1.1
nameserver 192.168.0.1  

添加谷歌的name server

nameserver 8.8.8.8
nameserver 8.8.4.4

再次添加GPG密钥成功

$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
OK