Debug mode.

[Dmitry R]

Is there a debug mode available for this image? Tried to set environment variable in docker-compose.yml to FLASK_DEBUG: 1, and tried to use
if name == 'main':
app.run(debug=True,host='0.0.0.0',port=80)
in python file. But everything does not seem to work. Only restarting the container works.

[Sebastián Ramírez]

You can run an interactive bash session, like:

docker run -it -p 80:80 -e MODULE_NAME="custom_app.custom_main" myimage bash

And inside of it run your Flask application with the Flask command:

FLASK_ENV=development FLASK_APP=hello.py flask run

Have in mind that this is only for debug/development. And it completely overrides Meinheld and Gunicorn. They won't in this case, only your Flask development server. But you can use it during development and then remove it for production.

[Jason Skipper]

For others that are looking to run in debug mode from docker-compose, this is working for me. I use this in the docker-compose.override.yml file for development. As @tiangolo mentioned, this completely overrides Meinheld and Gunicorn.

version: '3.5'
services:
  thisapp:
    ports:
      - "80:5000"
    stdin_open: true
    tty: true
    environment:
      - FLASK_APP=app
      - FLASK_ENV=development
    command: /bin/bash -c "flask run --host=0.0.0.0"

FLASK_APP, in my case, is the name of the subfolder under the main "app" folder. My setup is /app/app/__init__.py. There may be a better way, but this works for me.

[Sebastián Ramírez]

Yep, great @jaskipper ! Thanks for sharing it.

[github-actions]

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