Menu
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?
320
With a Command Line Argument The command used to launch Docker containers, docker run , accepts ENV variables as arguments. Simply run it with the -e flag, shorthand for --env , and pass in the key=value pair: sudo docker run -e POSTGRES_USER='postgres' -e POSTGRES_PASSWORD='password' ...
env in your project, it's only used to put values into the docker-compose. yml file which is in the same folder. Those are used with Docker Compose and Docker Stack.
Fetch Using docker exec Command Here, we are executing the /usr/bin/env utility inside the Docker container. Using this utility, you can view all the environment variables set inside Docker containers.
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
199
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
