问题
I'm pretty new to Docker, and I need to create the container to run Docker container as an Apache Mesos task.
The problem is that I can't find any relevant examples. They all are centered around Web development, which is not my case.
I have a pure Python project with large number of dependencies ( like Berkeley Caffe or OpenCV ). How to write a Docker file to properly enroll all dependecies ( and how to find them out?)
回答1:
The docker hub registry contains a number of official language images, which you can use as your base image.
- https://hub.docker.com/_/python/
The instructions tell you how you can build your python project, including the importation of dependencies.
├── Dockerfile <-- Docker build file
├── requirements.txt <-- List of pip dependencies
└── your-daemon-or-script.py <-- Python script to run
Image supports both Python 2 and 3, you specify this in the Dockerfile:
FROM python:3-onbuild
CMD [ "python", "./your-daemon-or-script.py" ]
The base image uses special ONBUILD instructions to all the hard work for you.
回答2:
The official Docker site has some step-by-step and reference documentation.
However, to get you started: what might help is to think about what you would do if you were to install and start your project on a fresh machine. You'd probably do something like this...
apt-get update
apt-get install -y python python-opencv wget ...
# copy your app into /myapp/
python /myapp/myscript.py
This maps more or less one-to-one to
FROM ubuntu:14.04
MAINTAINER Vast Academician <vast@example.com>
RUN apt-get update && apt-get install -y python python-opencv wget ...
COPY /path/on/host/to/myapp /myapp
CMD ["python", "/myapp/myscript.py"]
The above is untested, of course, but you probably get the idea.
来源：https://stackoverflow.com/questions/34381370/how-to-write-a-dockerfile-for-a-custom-python-project