简单使用docker 待完成

1. 修改到国内library地址

   sudo vi /etc/docker/damon.json
   
   {
     "registry-mirrors": ["https://registry.docker-cn.com"]
   }
   

2. 创建一个交互式容器，并命名为myubuntu

   sudo docker  run -it --name=myubuntu ubuntu /bin/bash
   
   Unable to find image 'ubuntu:latest' locally
   latest: Pulling from library/ubuntu
   Digest: sha256:5f4bdc3467537cbbe563e80db2c3ec95d548a9145d64453b06939c4592d67b6d
   Status: Downloaded newer image for ubuntu:latest