Docker compose is not copying any files - django

Question

Quite simple: the docker-compose configuration below does not allow any files to persist after running. So when I do docker exec -i -t aas-job-hunter_web_1 ls /app -alt, I see nothing.
Here is the (non-)working minimal example: https://github.com/philastrophist/test-docker
I'm on Windows 10, I've allowed mounted drives and enabled the TLS connection. I'm not sure what else to do. The thing that most confuses me is that requirements.txt is clearly copied over (since it installs it all) but it isn't there when I have a look docker exec.
My directory structure is:
parent/
website/
manage.py
...
Dockerfile
docker-compose.yml
...
Dockerfile:
FROM python:3.6
#WORKDIR /app
# By copying over requirements first, we make sure that Docker will cache
# our installed requirements rather than reinstall them on every build
COPY requirements.txt /app/requirements.txt
RUN pip install -r /app/requirements.txt
# Now copy in our code, and run it
COPY . /app
EXPOSE 8000
CMD python website/manage.py runserver 0.0.0.0:8000
# CMD tail -f /dev/null # use when testing
docker-compose.yml:
version: '2'
services:
web:
build: .
ports:
- "8000:8000"
volumes:
- .:/app
links:
- db
db:
image: "postgres:9.6"
ports:
- "5432:5432"
environment:
POSTGRES_PASSWORD: hunter2
Traceback:
> docker-compose -f docker-compose.yml up --build
Building web
Step 1/6 : FROM python:3.6
---> 0668df180a32
Step 2/6 : COPY requirements.txt /app/requirements.txt
---> Using cache
---> 3073d0bef876
Step 3/6 : RUN pip install -r /app/requirements.txt
---> Using cache
---> 8ad63bbb3de5
Step 4/6 : COPY . /app
---> 16390cdd6c2c
Step 5/6 : EXPOSE 8000
---> Running in f628000e8961
Removing intermediate container f628000e8961
---> 80e6994cfbd2
Step 6/6 : CMD python website/manage.py runserver 0.0.0.0:8000
---> Running in acb6b25eb558
Removing intermediate container acb6b25eb558
---> da8876d78103
Successfully built da8876d78103
Successfully tagged aas-job-hunter_web:latest
Starting aas-job-hunter_db_1 ... done
Recreating aas-job-hunter_web_1 ... done
Attaching to aas-job-hunter_db_1, aas-job-hunter_web_1
db_1 | LOG: database system was shut down at 2019-05-24 21:23:31 UTC
db_1 | LOG: MultiXact member wraparound protections are now enabled
db_1 | LOG: database system is ready to accept connections
web_1 | python: can't open file 'website/manage.py': [Errno 2] No such file or directory
aas-job-hunter_web_1 exited with code 2

Answer 1

Actually it copies files.
Solution 1
Change CMD to :
CMD python /app/website/manage.py runserver 0.0.0.0:8000
Solution 2
You call WORKDIR before the /app folder is created. So change your Dockerfile to :
FROM python:3.6.2
# By copying over requirements first, we make sure that Docker will cache
# our installed requirements rather than reinstall them on every build
COPY requirements.txt /app/requirements.txt
RUN pip install -r /app/requirements.txt
# Now copy in our code, and run it
COPY . /app
WORKDIR /app
#EXPOSE 8000
CMD python ./website/manage.py runserver 0.0.0.0:8000
# CMD tail -f /dev/null # use when testing
And call it after.
Moreover remember that in your current docker-compose file you are using bind mounts, not volumes, so the context - . will replace entirely the content of /app in your container.

Answer 2

Uncomment #WORKDIR /app.
I also cleaned the other parts a bit up to utilize the WORKDIR more.
FROM python:3.6
WORKDIR /app
COPY requirements.txt .
RUN pip install -r requirements.txt
COPY . .
EXPOSE 8000
CMD python website/manage.py runserver 0.0.0.0:8000

Answer 3

I think there is nothing wrong with COPY. But, you need to set the work directory to /app as your manage.py file is inside /app/website, not in /website inside Docker.
So, I think your Dockerfile should be like this:
FROM python:3.6
RUN mkdir /app
COPY requirements.txt /app/requirements.txt
RUN pip install -r /app/requirements.txt
COPY . /app
WORKDIR /app
EXPOSE 8000
CMD python website/manage.py runserver 0.0.0.0:8000