docker-compose 如何从另一个项目访问模块？

Question

I have 2 projects and i want project two to access functions in project one, how to do that?

this is are my simple files :)

project

root
---one
------main.py
---two
------main.py

docker-compose.yml

services:
  one:
    build: ./one
  two:
    build: ./two

two/main.py

from one.main import myfun

myfun()

error from docker logs

Traceback (most recent call last):
  File "main.py", line 1, in <module>
    from one.main import myfun
ModuleNotFoundError: No module named 'one'

Cheers :)

Answer 1

One container can't directly access or import code in another container, any more than if the two Python applications were running on physically separate machines.

Start by reading through the Python Packaging User Guide , and in particular, the guide on Packaging and distributing projects . You should treat your one application as an ordinary Python library; it should have a setup.py script and so on.

If one is runnable as an application in its own right, then one/Dockerfile can be extremely straightforward:

FROM python:3.8
WORKDIR /app
COPY . ./
RUN pip install .
CMD some_console_script

There are a couple of ways to get this library into the application two . One is to run, outside of Docker:

cd ../one
python setup.py bdist_wheel
mv dist/one-*.whl ../two/one.whl
cd ../two
docker build -t me/two .

That Dockerfile can then manually install the built wheel file:

FROM python:3.8
WORKDIR /app
COPY one.whl .
RUN pip install ./one.whl
COPY requirements.txt ./
RUN pip install -r requirements.txt
COPY . ./
CMD ["./two.py"]

You can also use a multi-stage build to do this in one command, using a fully isolated environment. The Dockerfile should be in the root directory in your diagram; it can be somewhere else, but you will need to use the root path in the docker build command and all COPY paths will be relative to root .

FROM python:3.8 AS build-one
WORKDIR /one
COPY one ./
RUN python setup.py bdist_wheel \
 && mv dist/one-*.whl one.whl

FROM python:3.8
WORKDIR /app
COPY --from=build-one /one/one.whl .
RUN pip install ./one.whl
COPY two/requirements.txt ./
# and repeating the rest of the "just build `two`" Dockerfile

Answer 2

I found the solution after some search and David Maze help

I had to change docker-compose file, Dockerfile for project two and move it to main directory.

new docker-compose.yml

version: '3'
services:
  one:
    build: ./one
  two:
    build:
      context: .
      dockerfile: Dockerfile-two

new Dockerfile-two

FROM python:3.6
WORKDIR /two

COPY /two /two/
COPY /one /two/one/

COPY /two/requirements.txt .
RUN pip install -r requirements.txt

CMD ["python", "/two/main.py"]

It has to be in the main root to have access to all folders. Cheers :)