random example of multi-stage build of a fastapi app

dockerfile

# --------------------------------------------------------------------------------

# temp stage

FROM python:3.10.9-slim-bullseye as builder

WORKDIR /code

ENV PYTHONDONTWRITEBYTECODE 1
ENV PYTHONUNBUFFERED 1

RUN apt-get update && \
    apt-get install -y --no-install-recommends gcc

RUN python -m venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"

COPY ./requirements.txt /code/requirements.txt
RUN pip install -r /code/requirements.txt

# --------------------------------------------------------------------------------

# final stage

FROM python:3.10.9-slim-bullseye

COPY --from=builder /opt/venv /opt/venv

WORKDIR /code

ENV PATH="/opt/venv/bin:$PATH"

COPY ./app.py /code/app.py

ENTRYPOINT ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "80"]

# --------------------------------------------------------------------------------