Docker ENV for Python variables

Question

Being new to python & docker, I created a small flask app (test.py) which has two hardcoded values:

username = "test" password = "12345" 

I'm able to create a Docker image and run a container from the following Dockerfile:

FROM python:3.6  RUN mkdir /code   WORKDIR /code   ADD . /code/   RUN pip install -r requirements.txt    EXPOSE 5000   CMD ["python", "/code/test.py"]` 

How can I create a ENV variable for username & password and pass dynamic values while running containers?

Answer 1

Within your python code you can read env variables like:

import os username = os.environ['MY_USER'] password = os.environ['MY_PASS'] print("Running with user: %s" % username) 

Then when you run your container you can set these variables:

docker run -e MY_USER=test -e MY_PASS=12345 ... <image-name> ... 

This will set the env variable within the container and these will be later read by the python script (test.py)

More info on os.environ and docker env