vim /etc/docker/daemon.json

 在daemon中配置一下dns

{
  "registry-mirrors": [
           "https://docker.m.daocloud.io",
        "https://hub-mirror.c.163.com",
        "https://dockerproxy.com",
        "https://docker.mirrors.ustc.edu.cn",
        "https://docker.nju.edu.cn"
  ],
  "dns" : [
    "114.114.114.114",
    "8.8.8.8"
  ]
}

 检测：

docker run hello-world