the base image of tornado
tornado 网络服务器的基础镜像
docker pull companyservice/tornado
downlad and run the container based on the image
下载并运行基于镜像的容器
docker run -d -P -v ($PWD):/server companyservice/tornado
the volume directory /serveris used to update the server code,
server.py is required to be the main python file
/server 是服务器代码的挂载目录，确保server.py是服务器启动文件