Docker scripts update files whitout build again

Question

I have a question about how I can use docker in order to run simples python scripts. I have a directory with some python scripts, and I create a Dockerfile:

FROM python:2.7

ENV PYTHONIOENCODING UTF-8

ADD . /
WORKDIR ./

RUN pip install pandas

CMD [ "python", "./hello.py" ]

then I build using:

docker build -t hello.

and run with: `docker run hello``

My question is about change the hello.py file without build again.

Any tip here ?

Answer 1

I would prepare docker-compose for that. And then mount hellp.py from host to container. I am not sure whether it's possible to update running hello.py on the fly.

So my way would be:

version: '2.1'
services:
  hello:
   image: hello
   volumes: 
     - /home/host/app/hello.py:/hello.py

So everytime you will do a change in hello.py you won't have to rebuild image just docker-compose down and docker-compose up to reflect changes in your .py application.

If you have more than one file you can mount whole directory.