在Docker容器中为python使用配置文件

Question

I have a docker container with a python application in it. The application needs the path of a config file as an command line argument:

$ python MyApp.py config.json

My docker file looks like this

# Use an official Python runtime as a parent image
FROM python:3.6-slim

# Set the working directory to /app
WORKDIR /app

# Copy the current directory contents into the container at /app
ADD . /app

# Install any needed packages specified in requirements.txt
RUN pip install --trusted-host pypi.python.org -r requirements.txt

# Make port 80 available to the world outside this container
EXPOSE 80

# Run app.py when the container launches
CMD ["python", "app.py"]

How can I pass the command line argument for the config file to the application inside the docker container? The directory with the config file is inside the container:

ContainerDir
    -> app.py
    -> Dockerfile
    -> Config/config.json

Thanks!

Answer 1

In the docker run command, anything after the image name will be parsed as [COMMAND] [ARGS...] .

In your case, you can use the following docker run command to pass extra arguments to your program.

docker run <image>:<tag> python app.py Config/config.json

PS Docker run reference: https://docs.docker.com/engine/reference/run/