Docker社区版(CE)地址：
https://hub.docker.com/search/?type=edition&offering=community
Docker文档地址：
https://docs.docker.com
https://docs.docker.com/install/
Docker社区版(CE)centos版下载地址：
###rpm安装包
https://download.docker.com/linux/centos/7/x86_64/stable/Packages/
##压缩安装包
https://download.docker.com/linux/static/stable/x86_64/