docker 安装好后运行命令：
docker images
提示错误如下：
Get http:///var/run/docker.sock/v1.19/images/json: dial unix /var/run/docker.sock: no such file or directory. Are you trying to connect to a TLS-enabled daemon without TLS?
#或下面提示
Post http:///var/run/docker.sock/v1.19/images/create?fromImage=ubuntu%3Alatest: dial unix /var/run/docker.sock: no such file or directory. Are you trying to connect to a TLS-enabled daemon without TLS?
解决问题如下：
service docker restart
sudo /sbin/chkconfig --add docker
sudo /sbin/chkconfig --list docker
sudo /sbin/chkconfig docker on
service docker restart
然后就可以尽情的玩耍了。