docker版本选择：

​​https://github.com/rancher/install-docker/blob/master/18.06.sh​​

 docker ps -a
Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get http://%2Fvar%2Frun%2Fdocker.sock/v1.38/containers/json?all=1: dial unix /var/run/docker.sock: connect: permission denied

chown <user> /var/run/docker.sock

Delta RPMs disabled because /usr/bin/applydeltarpm not installed 解决办法

yum provides '*/applydeltarpm'  
yum install deltarpm -y