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

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