gistfile1.txt

services:
 db:
   image: postgres:17
   environment:
     POSTGRES_DB: ${DATABASE_NAME}
     POSTGRES_USER: ${DATABASE_USERNAME}
     POSTGRES_PASSWORD: ${DATABASE_PASSWORD}
   ports:
     - "5432:5432"
   env_file:
     - .env

 django-web:
   build: .
   container_name: django-docker
   ports:
     - "8000:8000"
   depends_on:
     - db
   environment:
     DJANGO_SECRET_KEY: ${DJANGO_SECRET_KEY}
     DEBUG: ${DEBUG}
     DJANGO_LOGLEVEL: ${DJANGO_LOGLEVEL}
     DJANGO_ALLOWED_HOSTS: ${DJANGO_ALLOWED_HOSTS}
     DATABASE_ENGINE: ${DATABASE_ENGINE}
     DATABASE_NAME: ${DATABASE_NAME}
     DATABASE_USERNAME: ${DATABASE_USERNAME}
     DATABASE_PASSWORD: ${DATABASE_PASSWORD}
     DATABASE_HOST: ${DATABASE_HOST}
     DATABASE_PORT: ${DATABASE_PORT}
   env_file:
     - .env

DJANGO_SECRET_KEY=your_secret_key
DEBUG=True
DJANGO_LOGLEVEL=info
DJANGO_ALLOWED_HOSTS=localhost
DATABASE_ENGINE=postgresql_psycopg2
DATABASE_NAME=dockerdjango
DATABASE_USERNAME=dbuser
DATABASE_PASSWORD=dbpassword
DATABASE_HOST=db
DATABASE_PORT=5432

   # 'DJANGO_ALLOWED_HOSTS' should be a single string of hosts with a , between each.
   # For example: 'DJANGO_ALLOWED_HOSTS=localhost 127.0.0.1,[::1]'
   ALLOWED_HOSTS = os.environ.get("DJANGO_ALLOWED_HOSTS","127.0.0.1").split(",")

3. Set the SECRET_KEY to read from environment files.
   In settings.py, set SECRET_KEY to:

   # SECURITY WARNING: keep the secret key used in production secret!
   SECRET_KEY = os.environ.get("DJANGO_SECRET_KEY")

4. *Set DEBUG to read from environment files.
   In settings.py, set DEBUG to:

   # SECURITY WARNING: don't run with debug turned on in production!
   DEBUG = bool(os.environ.get("DEBUG", default=0))

Step five: Build and run your new Django project

PostgreSQL:

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.{}'.format(
            os.getenv('DATABASE_ENGINE', 'sqlite3')
        ),
        'NAME': os.getenv('DATABASE_NAME', 'polls'),
        'USER': os.getenv('DATABASE_USERNAME', 'myprojectuser'),
        'PASSWORD': os.getenv('DATABASE_PASSWORD', 'password'),
        'HOST': os.getenv('DATABASE_HOST', '127.0.0.1'),
        'PORT': os.getenv('DATABASE_PORT', 5432),
    }
}