[SOLVED] Adding libvips to a Rails 7 Docker image

Adding libvips to a Rails 7 Docker image

I'm new to Docker and trying to create a Dockerfile for this new Rails 7 app. I'm using vips instead of imagemagick for the memory benefits.

and my local machine is a mac so brew install vips takes care of my non docker development flow, but it hasn't gone so well using the ruby-vips gem, or installing from source.

Running $ docker compose up results in:

/usr/local/bundle/gems/ffi-1.15.5/lib/ffi/library.rb:145:in block in ffi_lib': Could not open library 'vips.so.42': vips.so.42: cannot open shared object file: No such file or directory. (LoadError)

With the following docker-compose.yml:

version: "3.9"
services:
  db:
    image: postgres
    volumes:
      - ./tmp/db:/var/lib/postgresql/data
    environment:
      POSTGRES_PASSWORD: password
  web:
    build: .
    command: bash -c "rm -f tmp/pids/server.pid && bundle exec rails s -p 3000 -b '0.0.0.0'"
    volumes:
      - .:/myapp
    ports:
      - "3000:3000"
    depends_on:
      - db

and a Dockerfile:

FROM ruby:3.0.1
RUN apt-get update -qq && apt-get install -y nodejs postgresql-client
WORKDIR /myapp
COPY Gemfile /myapp/Gemfile
COPY Gemfile.lock /myapp/Gemfile.lock
RUN gem install ruby-vips
RUN bundle install

# Add a script to be executed every time the container starts.
COPY entrypoint.sh /usr/bin/
RUN chmod +x /usr/bin/entrypoint.sh
ENTRYPOINT ["entrypoint.sh"]
EXPOSE 3000

# Configure the main process to run when running the image
CMD ["rails", "server", "-b", "0.0.0.0"]

I've also tried installing from source (https://www.libvips.org/install.html) install of using ruby-vips with no luck.

Solution

TLDR; ruby-vips need libvips42 installed on your docker image.

Update your Dockerfile to use the following:

RUN apt-get update -qq && apt-get install -y --no-install-recommends nodejs postgresql-client libvips42

PS: run docker compose down and docker compose up --build to force a rebuild of your docker images.