[Docker] docker basic commands and DockerFile

A docker basic command❤️

1 Docker starts automatically when booting
(1) Set docker to start automatically when booting:

systemctl enable docker

(2) Cancel auto-start at boot:

systemctl disable docker

(3) Other basic commands:

#启动docker：
systemctl start docker
#停止dokcer：
systemctl stop docker
#查看docker状态：
systemctl status docker 
#重启docker：
systemctl restart docker

2 Set the container to automatically restart

docker run -d --restart=always --name 设置容器名 使用的镜像 

--restart Specific parameter value details :
 no // Default policy, do not restart the container when the container exits;
 on-failure // Restart the container only when the container exits abnormally;
 on-failure:3 // When the container exits abnormally Restart the container, up to 3 times;
 always // Restart the container regardless of the exit status;
 un