Visual Studio Code - how to remote debug python code in a Docker Container

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Iam trying to remote dubug python in VSC:

It is main.py file:

print('Hello, World')

debug.py:

import ptvsd
ptvsd.enable_attach('my_secret', address=('0.0.0.0', 7102))
ptvsd.wait_for_attach()

Dockerfile:

FROM python:3.6-slim

EXPOSE 7102

RUN pip install ptvsd

WORKDIR /app

COPY . .

CMD ["python", "debug.py"]

and it is launch.json file:

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Attach (Remote Debug)",
            "type": "python",
            "request": "attach",
            "localRoot": "${workspaceRoot}",
            "remoteRoot": "/app",
            "port": 7102,
            "secret": "my_secret",
            "host": "172.17.0.3"
        }
    ]
}

It is a command to build and start container:

docker build -t python-for-debug .

docker run -it -p 7102:7102 python-for-debug

When I run the debugger I get: screen of vs code

No any errors at debug console, not output, not problems. No any output for running container. No docker logs

VS Code version: 1.15.0 Docker version 17.06.0-ce, build 02c1d87

visual-studio-code docker remote-debugging python
3 Answers
user_4633290

I think the problem is that your docker process terminates.

You start your debug.py as a command in the Dockerfile. So Docker starts the task, waits for your debugger to attach and then exits because there is nothing more to do.

Seems you need to place your code into debug.py as the easiest try. And please remember that you cannot place the breakpoint right after 

ptvsd.wait_for_attach()

so you'd better write some spare lines between.
Hope this helps.

user_75700320
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