Docer-compose.yml in Django project: environment variables are not created from the .env file

My docker-compose.yml:

version: '3.8'

services:
  web:
    build: ./app
    command: python3 manage.py runserver 0.0.0.0:8000
    volumes:
      - ./app/:/usr/src/app/
    ports:
      - 8000:8000
    env_file: 
      - .dev.env

my Dockerfile in ./app:

FROM kuralabs/python3-dev

WORKDIR /usr/src/app

ENV PYTHONDONTWRITEBYTECODE 1
ENV PYTHONUNBUFFERED 1

# RUN pip install --upgrade pip 

COPY ./requirements.txt .
RUN pip3 install -r requirements.txt

COPY . .

My file '.dev.env':

ALLOWED_HOSTS='localhost 127.0.0.1'
DEBUG=1
SECRET_KEY='django-insecure-...'

My catalog in attached

I run the project with the commands: $docker-compose build $docker-compose up -d

I get variables in settings.py:

load_dotenv()
print(f'Environment: {os.environ}')

my variables from the '.dev.env' file are not in the list of environment variables.

Please help me understand why '.dev.env' variables don't get into the environment?

You can use environment variables from a .env file by assigning them to your service, take the following example

version: '3.9'
services:
  something:
    image: someimage
    container_name: comecontainer
    environment:
      - MARIADB_ROOT_USER
      - MARIADB_ROOT_PASSWORD
      - MARIADB_DATABASE

The environment variables are directly read from the .env file located next to the docker-compose.yaml. Note that env_file still works the same way. So instead of reading from the .env file, you can utilize env_file to target (in your case) the .dev.env file.

Hope this helps.

In addition, perhaps you could assign the path of load_dotenv.

from dotenv import load_dotenv
from pathlib import Path, PurePosixPath

dotenv_path = PurePosixPath(Path(__file__).resolve().parent.parent, '.dev.env').as_posix()
load_dotenv(dotenv_path=dotenv_path)

That should also work, when placed somewhere after your imports in manage.py.

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