Dockerfile

# We use Debian images because they are considered more stable than the alpine
# ones becase they use a different C compiler. Debian images also come with
# all useful packages required for image manipulation out of the box. They
# however weigh a lot, approx. up to 1.5GiB per built image.
FROM python:3.11 as production

# Install dependencies in a virtualenv
ENV VIRTUAL_ENV=/venv

RUN useradd bakerydemo --create-home && mkdir /app $VIRTUAL_ENV && chown -R bakerydemo /app $VIRTUAL_ENV

WORKDIR /app

# Set default environment variables. They are used at build time and runtime.
# If you specify your own environment variables on Heroku, they will
# override the ones set here. The ones below serve as sane defaults only.
#  * PATH - Make sure that Poetry is on the PATH, along with our venv
#  * PYTHONPATH - Ensure `django-admin` works correctly.
#  * PYTHONUNBUFFERED - This is useful so Python does not hold any messages
#    from being output.
#    https://docs.python.org/3.9/using/cmdline.html#envvar-PYTHONUNBUFFERED
#    https://docs.python.org/3.9/using/cmdline.html#cmdoption-u
#  * DJANGO_SETTINGS_MODULE - default settings used in the container.
#  * PORT - default port used. Please match with EXPOSE.
#    Heroku will ignore EXPOSE and only set PORT variable. PORT variable is
#    read/used by Gunicorn.
#  * WEB_CONCURRENCY - number of workers used by Gunicorn. The variable is
#    read by Gunicorn.
#  * GUNICORN_CMD_ARGS - additional arguments to be passed to Gunicorn. This
#    variable is read by Gunicorn
ENV PATH=$VIRTUAL_ENV/bin:$PATH \
    PYTHONPATH=/app \
    PYTHONUNBUFFERED=1 \
    DJANGO_SETTINGS_MODULE=bakerydemo.settings.production \
    PORT=8005 \
    WEB_CONCURRENCY=3 \
    GUNICORN_CMD_ARGS="-c gunicorn-conf.py --max-requests 1200 --max-requests-jitter 50 --access-logfile - --timeout 25 --reload"

# Make $BUILD_ENV available at runtime
ARG BUILD_ENV
ENV BUILD_ENV=${BUILD_ENV}

# Port exposed by this container. Should default to the port used by your WSGI
# server (Gunicorn). Heroku will ignore this.
EXPOSE 8005

# Don't use the root user as it's an anti-pattern and Heroku does not run
# containers as root either.
# https://devcenter.heroku.com/articles/container-registry-and-runtime#dockerfile-commands-and-runtime
USER bakerydemo

# Install your app's Python requirements.
RUN python -m venv $VIRTUAL_ENV
COPY --chown=bakerydemo requirements.txt ./
COPY --chown=bakerydemo requirements/ ./requirements
RUN pip install --upgrade pip && pip install -r requirements/production.txt

# Copy application code.
COPY --chown=bakerydemo . .

# Collect static. This command will move static files from application
# directories and "static_compiled" folder to the main static directory that
# will be served by the WSGI server.
RUN SECRET_KEY=none python manage.py collectstatic --noinput --clear

# Run the WSGI server. It reads GUNICORN_CMD_ARGS, PORT and WEB_CONCURRENCY
# environment variable hence we don't specify a lot options below.
CMD gunicorn bakerydemo.wsgi:application