docker dns配置（解决pip 下载第三方模块“Retry(total=3, connect=None, read=None, redirect=None, status”

针对docker容器下python pip install 安装第三方库时报错Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None))...问题

修改完daemon.json dns后可解决问题

具体如下：

{
   "registry-mirrors": [
    "https://xxxx.mirror.aliyuncs.com",
    "https://reg-mirror.qiniu.com",
    "https://registry.docker-cn.com"
  ],
   "dns":[
    "114.114.114.114",
    "8.8.8.8"
  ]
}