如何构建docker镜像
docker build <Dockerfile path> -t image-name
如何启动docker
systemctl start docker.service
#(OR)
systemctl start docker
# it will start docker
启动docker容器
$ docker start <container_id>
docker运行镜像
docker run <image id> --name 'container name'
启动docker镜像
docker start centos
docker如何运行现有容器
docker start <container-name/ID>