使用dockerfile自动化构建镜像

我现在需要一个包含如下几个服务的环境,如何实现呢？
redis
mongodb
mysql
elasticsearch
nginx
python

1.了解docker

docker run hello-world
docker run --detach --publish=80:80 --name=webserver nginx
docker run -it ubuntu bash

2. 关于dockerfile

https://docs.docker.com/engine/reference/builder/
what is a dockerfile
how to create dockerfile
how to build image from dockerfile
basic commands

3. 编写dockerfile