由于之前安装过旧版本docker没有卸载干净，导致安装失败；需要完全卸载旧版本

13、file /usr/bin/docker from install of docker-ce-18.03.0.ce-1.el7.centos.x86_64 conflicts with file from package docker-common-2:1.13.1-203.git0be3e21.el7.centos.x86_64

 

 

 

13、file /usr/bin/docker from install of docker-ce-18.03.0.ce-1.el7.centos.x86_64 conflicts with file from package docker-common-2:1.13.1-203.git0be3e21.el7.centos.x86_64