Python Flask HelloWorld Dockerfile

Dockerfile

FROM python:3.7-alpine as builder

# install dependencies required to build python packages
RUN apk update && apk add --no-cache make gcc && pip install --upgrade pip


# setup venv and download or build dependencies
ENV VENV="/venv"
ENV PATH="${VENV}/bin:${PATH}"

COPY requirements.txt .
RUN python -m venv ${VENV} \
    && pip install --no-cache-dir -r requirements.txt

FROM python:3.7-alpine

# setup venv with dependencies from the builder stage
ENV VENV="/venv"
ENV PATH="${VENV}/bin:$PATH"
COPY --from=builder ${VENV} ${VENV}

# copy app files
WORKDIR /app
COPY app .

# run the app
EXPOSE 5000
ENV FLASK_APP="hello.py"
CMD [ "flask", "run", "--host=0.0.0.0" ]