"Distroless" Docker Images

"Distroless" images contain only your application and its runtime dependencies. They do not contain package managers, shells or any other programs you would expect to find in a standard Linux distribution.
# Build a virtualenv using the appropriate Debian release
# * Install python3-venv for the built-in Python3 venv module (not installed by default)
# * Install gcc libpython3-dev to compile C Python modules
# * Update pip to support bdist_wheel
FROM debian:buster-slim AS build
RUN apt-get update && \
apt-get install --no-install-suggests --no-install-recommends --yes python3-venv gcc libpython3-dev && \
python3 -m venv /venv && \
/venv/bin/pip install --upgrade pip
# Build the virtualenv as a separate step: Only re-execute this step when requirements.txt changes
FROM build AS build-venv
COPY requirements.txt /requirements.txt
RUN /venv/bin/pip install --disable-pip-version-check -r /requirements.txt
# Copy the virtualenv into a distroless image
FROM gcr.io/distroless/python3-debian10
COPY --from=build-venv /venv /venv
COPY . /app
ENTRYPOINT ["/venv/bin/python3", "psutil_example.py"]