Make static files from django's collecstatic part of Docker image - django

Question

I want to include static files generated from python manage.py collectstatic in the Docker image.
For this, I included the following line in my Dockerfile
CMD python manage.py collectstatic --no-input
But since it runs the command in an intermediate container, the generated static files aren't present STATIC_ROOT directory. The following lines I can see on the logs of build.
Step 13/14 : CMD python manage.py collectstatic --no-input
---> Running in 8ea5efada461
Removing intermediate container 8ea5efada461
---> 67aef71cc7b6
I'd like to include the generated static files in the image. What shall I do to achieve this?
Update ( solution )
I was using CMD but instead, I should use RUN command for this task as the docs say
The RUN instruction will execute any commands in a new layer on top of the current image and commit the results. The resulting committed image will be used for the next step in the Dockerfile.

Answer 1

You need to copy the output of collectstatic into your final container.
For example, my dockerfile contains the same concept (this isn't the complete dockerfile, just the relevant pieces)
# Pull base image
FROM python:3.7.7-slim-buster AS python-base
COPY requirements.txt /requirements.txt
WORKDIR /project
RUN apt-get update && \
apt-get -y upgrade && \
pip install --upgrade pip && \
pip install -r /requirements.txt
FROM node:8 AS frontend-deps-npm
WORKDIR /
COPY ./package.json /package.json
RUN npm install
COPY . /app
WORKDIR /app
RUN /node_modules/gulp/bin/gulp.js
FROM python-base AS frontend-deps
COPY --from=frontend-deps-npm /app /app
WORKDIR /app
RUN python manage.py collectstatic -v 2 --noinput
FROM python-base AS app
COPY . /app
COPY --from=frontend-deps /app/static-collection /app/static-collection