Question 84955 in Docker Question posted in
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Multistage docker build for Django

I am dockerizing my Django application with docker multi-stage build. Now am facing an issue with dependencies

Dockerfile

FROM python:3.8-slim-buster AS base
WORKDIR /app
RUN python -m venv venv
ENV PATH="/app/venv:$PATH"
COPY requirements.txt .
RUN pip install -r requirements.txt 
    && pip install gunicorn
COPY entrypoint.sh .
COPY . .

FROM python:3.8-slim-buster
WORKDIR /app
ENV PYTHONDONTWRITEBYTECODE 1
ENV PYTHONUNBUFFERED 1
COPY --from=base /app /app/
ENV PATH="/app/venv:$PATH"
ENTRYPOINT sh entrypoint.sh

When running the container it raises import error.

ImportError: Couldn’t import Django. Are you sure it’s installed and available on your PYTHONPATH environment variable? Did you forget to activate a virtual environment?

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2

Answers


  1. 0

    I went to the same situation few month ago and it was a conflict between 2 packages, so django was not installed during the pip install.

    You can add on your docker build command the ‘–progress=plain’ option and see if everything is ok, during the docker build :

    • $ docker build –no-cache –progress=plain -t my_service_name .
      Baptiste.
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  2. 0

    here is a working multistage docker build for django.

    ENV PYTHONBUFFERED 1
WORKDIR /opt/webapp/

ENV VIRTUAL_ENV=/opt/venv
RUN python3 -m venv $VIRTUAL_ENV
ENV PATH="$VIRTUAL_ENV/bin:$PATH"
# copy requirements.txt
COPY ./requirements.txt /opt/webapp/requirements.txt
RUN pip3 install -r requirements.txt --no-cache-dir

# runner stage
FROM python:3.8-slim-buster AS runner

ARG SECRET_KEY
ARG DEBUG

WORKDIR /opt/webapp
RUN groupadd -r django 
  && useradd -d /opt/webapp -r -g django django 
  && chown django:django -R /opt/webapp
USER django

COPY --from=builder /opt/venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"

COPY --chown=django:django . /opt/webapp/

# run the server
CMD gunicorn conf.wsgi:application --bind 0.0.0.0:8000
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