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docker django development and production

# Base off the official python image
# Define a common stage for dev and prod images called base
FROM python:3.10 as base
# Set environment variables
ENV PYTHONDONTWRITEBYTECODE 1
ENV PYTHONUNBUFFERED 1
# Create a user to avoid running containers as root in production
RUN addgroup --system web 
    && adduser --system --ingroup web web
# Install os-level dependencies (as root)
RUN apt-get update && apt-get install -y -q --no-install-recommends 
  # dependencies for building Python packages
  build-essential 
  # postgress client (psycopg2) dependencies
  libpq-dev 
  # cleaning up unused files to reduce the image size
  && apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false 
  && rm -rf /var/lib/apt/lists/*
# Switch to the non-root user
USER web
# Create a directory for the source code and use it as base path
WORKDIR /home/web/code/
# Copy the python depencencies list for pip
COPY --chown=web:web ./requirements/base.txt requirements/base.txt
# Switch to the root user temporary, to grant execution permissions.
USER root
# Install python packages at system level
RUN pip install --no-cache-dir -r requirements/base.txt
# Copy entrypoint script which waits for the db to be ready
COPY --chown=web:web ./docker/app/entrypoint.sh /usr/local/bin/entrypoint.sh
RUN chmod +x /usr/local/bin/entrypoint.sh
USER web
# This script will run before every command executed in the container
ENTRYPOINT ["entrypoint.sh"]


# Define an image for local development. Inherits common packages from the base stage.
FROM base as dev
# Copy the scripts that starts the development application server (runserver)
COPY --chown=web:web ./docker/app/start-dev-server.sh /usr/local/bin/start-dev-server.sh
USER root
RUN chmod +x /usr/local/bin/start-dev-server.sh
USER web
# The development server starts by default when the container starts
CMD ["start-dev-server.sh"]


# Define an image for production. Inherits common packages from the base stage.
FROM base as prod
# Install extra packages required in production
USER root
COPY --chown=web:web ./requirements/prod.txt requirements/prod.txt
RUN pip install --no-cache-dir -r requirements/prod.txt
# Copy the script that starts the production application server (gunicorn)
COPY --chown=web:web ./docker/app/start-prod-server.sh /usr/local/bin/start-prod-server.sh
RUN chmod +x /usr/local/bin/start-prod-server.sh
USER web
# Copy the source code of our django app to the working directoy
COPY --chown=web:web . ./
# The production server starts by default when the container starts
CMD ["start-prod-server.sh"]

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