centos8 Failed to get properties: Access denied

Failed to start docker.service: Access denied

今天在centos8上安装docker，参考以下网址

https://www.cnblogs.com/yufeng218/p/8370670.html

安装完了运行docker info显示错误

Server:ERROR: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?errors pretty printing info

找了N多解决方案，什么daemon.json的、yum update的、systemctl start docker的都白搭，而且运行任何的systemctl命令都被拒绝，显示Failed to start docker.service: Access denied

最后找到个解决方案 

https://superuser.com/questions/1125250/systemctl-access-denied-when-root/1130976

In my case, I had just upgraded systemd and any systemctl command was failing:

However according to the init manpage, you can do the same thing by sending SIGTERM to the daemon running as PID 1, which worked:

This reloaded the daemon, after which all the systemctl commands started working again.