How to setup python environment in docker in my case?

Question

I am trying to setup my python environment in docker.

My docker image is like this:

FROM python:2.7
# updating repository
RUN apt-get update

RUN mkdir /usr/src/app

WORKDIR /usr/src/app

COPY requirements.txt requirements.txt

RUN pip install --no-cache -r requirements.txt

EXPOSE 8888

COPY . .

CMD ["python", "test.py"]

with this build command:

docker build -t ml-python-2.7 .

After image is built, I ran

docker run -it --rm --name ml-container  ml-python-2.7 python test.py

My sample test.py

print('test here')

It works when I first run this command.

docker run -it --rm --name ml-container  ml-python-2.7 python test.py

but after I change the test.py to print('second test') and run the above command again, it still output test here.

How do I make sure it updates automatically or if there is more elegant way to do this?

Thanks!

Are you simply modifying test.py in the current directory? The running docker container can't see inside your current directory. — Joel Cornett
– Joel Cornett, Commented Mar 8, 2018 at 6:27
either mount the current directory in docker ( use -v option), get in to bash inside docker and edit the file — vumaasha
– vumaasha, Commented Mar 8, 2018 at 6:30

Lahiru Karunaratne · Accepted Answer · 2018-03-08 06:52:50Z

1

Docker does not store the changes you are making to files inside the container unless you commit it. If you want it to do so, you need to do a Docker Commit like:

docker commit <CONTAINER NAME HERE>

Or you could mount a local folder to the docker image like this:

docker run -ti -v ~/folder_in_host:/var/log/folder_in_container <IMAGE NAME HERE>

edited Mar 8, 2018 at 6:52

answered Mar 8, 2018 at 6:35

Lahiru Karunaratne

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