Docker安装后报错：docker: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?.
安装Docker以后执行 docker run hello-world 进行测试
结果报错如下：
解决办法：
# systemctl daemon-reload
# sudo service docker restart
# sudo service docker status 确认docker正常启动
# docker run hello-world
至此已经成功