How I use Docker and Compose

.dockerignore

.*
!.coveragerc
!.env
!.pylintrc

.env-docker.sample

DEBUG=true
DATABASE_URL=postgres://postgres@postgres/postgres
SECRET_KEY=HAVE-IT-YOUR-WAY
DJANGO_ADMIN_URL=/admin/

docker-compose.yml

version: '2'

services:

  postgres:
    container_name: YOUR-PROJECT-postgres-db
    restart: always
    image: postgres:latest
    ports:
      - "5432:5432"
    volumes:
      - postgres_data:/var/lib/postgresql/data/

  redis:
    image: redis:3.0

  web:
    container_name: YOUR-PROJECT-web
    build:
      context: .
      dockerfile: Dockerfile
    # user: django
    depends_on:
      - postgres
      - redis
    restart: always
    ports:
      - "8000:8000"
    env_file: .env-docker
    volumes:
      - .:/src
    # command: /gunicorn.sh

volumes:
  postgres_data:

docker-entrypoint.sh

#!/bin/bash

# apply database migrations
python manage.py migrate --noinput

# collect static files
python manage.py collectstatic --noinput

python manage.py runserver 0.0.0.0:8000

# Start Gunicorn processes
#echo Starting Gunicorn.

#exec gunicorn app.wsgi:application \
#    --name app \
#    --bind 0.0.0.0:80 \
#    --workers 3 \
#    --log-level=info \
#    --log-file=/src/logs/gunicorn.log \
#    --access-logfile=/src/logs/access.log \
#    "$@"

Dockerfile

FROM python:3.6.1

# This prevents Python from writing out pyc files
ENV PYTHONDONTWRITEBYTECODE 1

# This keeps Python from buffering stdin/stdout
ENV PYTHONUNBUFFERED 1

EXPOSE 8000

WORKDIR /src

COPY requirements.txt /src/requirements.txt

RUN mkdir -p /src/assets \
    && mkdir -p /src/logs \
    && chmod 755 /src \
    && pip install --no-cache-dir -r /src/requirements.txt

COPY . /src/

CMD ["/src/docker-entrypoint.sh", "-n"]

requirements.txt

Django
django-environ
whitenoise

# Postgres
psycopg2

# Redis
django-redis
redis

# for production
gunicorn

# for testing
pytest
pytest-django
pytest-sugar

re: you can remove line 13 in Dockerfile and replace it with line 20

This will invalidate my cache and cause a rebuild when I don't want it to.

Fair point.