how to execute a python program (with args) that uses docker container?

Question

First off, I might have formulated the question inaccurately, feel free to modify if necessary.

Although I am quite new to docker and all its stuff, yet somehow managed to create an image (v2) and a container (cont) on my Win 11 laptop. And I have a demo.py which requires an .mp4 file as an arg.

Now, if I want to run the demo.py file, 1) I go to the project's folder (where demo.py lives), 2) open cmd and 3) run: docker start -i cont. This starts the container as:

root:834b2342e24c:/project#

Then, I should copy 4) my_video.mp4 from local project folder to container's project/data folder (with another cmd) as follows:

docker cp data/my_video.mp4 cont:project/data/.

Then I run: 5) python demo.py data/my_video.mp4. After a while, it makes two files: my_video_demo.mp4 and my_video.json in the data folder in the container. Similarly, I should copy them back to my local project folder: 6)

docker cp cont:project/data/my_video_demo.mp4 data/, docker cp cont:project/data/my_video_demo.json data/

Only then I can go to my local project/data folder and inspect the files. I want to be able to just run a particular command that does 4) - 6) all in one. I have read about -v option where, in my case, it would be(?) -v /data:project/data, but I don't know how to proceed.

Is it possible to do what I want? If everything is clear, I hope to get your support. Thank you.

Docker probably isn't the right tool for what you're describing, since a container doesn't usually have access to files outside the container. Can you use a Python virtual environment instead? — David Maze
– David Maze, Commented Jan 20, 2022 at 12:23
I'd love to, but demo.py requires dependencies that are of Linux, not Windows. I tried building the project on Windows, but failed spectacularly :D. — bit_scientist
– bit_scientist, Commented Jan 20, 2022 at 23:27

bill27 · Accepted Answer · 2022-01-20 10:45:15Z

0

You should indeed use Docker volumes. The following command should do it.

docker run -it -v /data:project/data v2

answered Jan 20, 2022 at 10:45

bill27

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bit_scientist Over a year ago

1. Where does it run the demo.py file? 2. Where are the output files get created?

bit_scientist · Accepted Answer · 2022-02-23 05:39:57Z

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Well, I think I've come up with a way of dealing with it.

I have learned that with -v one can create a place that is shared between the local host and the container. All you need to do is that run the docker and provide -v as follows:

docker run --gpus all -it -v C:/Workspace/project/data:/project/data v2:latest python demo.py data/my_video_demo.mp4

--gpus - GPU devices to add to the container ('all' to pass all GPUs);

-it - tells the docker that it should open an interactive container instance.

Note that every time you run this, it will create a new container because of -it flag.

Partial credit to @bill27

edited Feb 23, 2022 at 5:39

answered Jan 22, 2022 at 9:13

bit_scientist

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