Python app does not print anything when running detached in docker

Question

I have a Python (2.7) app which is started in my dockerfile:

CMD [\"python\",\"main.py\"]

main.py prints some strings when it is s

Answer 1

If you aren't using docker-compose and just normal docker instead, you can add this to your Dockerfile that is hosting a flask app

ARG FLASK_ENV="production"
ENV FLASK_ENV="${FLASK_ENV}" \
    PYTHONUNBUFFERED="true"

CMD [ "flask", "run" ]