1 sudo apt update && sudo apt install doker.io
查看docker版本号，一定要用root权限查看，否则无法查看到docker Server的版本号，并且会报以下错误
1 sudo docker version
非root权限执行报错
Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get http://%2Fvar%2Frun%2Fdocker.sock/v1.25/version: dial unix /var/run/docker.sock: connect: permission denied