docker安装

安装方法： https://www.jianshu.com/p/b37ea98b38f2
测试问题： Got permission denied while trying to connect to the Docker daemon socket
解决办法：https://blog.csdn.net/sduyyy/article/details/121139313
配置阿里云镜像加速： https://www.jianshu.com/p/b37ea98b38f2