I’ve followed along with the Hotiwired ATS once and now am working through it again using Bootstrap, which seems like it should be a minor change. I keep running into an issue that I can’t figure out with yarn.

Basically, yarn isn’t available in the container and for the life of me I can’t figure out why. I’ve made some small changes to the basic Dockerfile created by Rails in an effort to get it working and based on some other successful container/compose starts and hoping the community can see something I can’t.

Dockerfile

# syntax = docker/dockerfile:1

# Make sure RUBY_VERSION matches the Ruby version in .ruby-version and Gemfile
ARG RUBY_VERSION=3.2.2
# FROM registry.docker.com/library/ruby:$RUBY_VERSION-slim AS base
FROM ruby:${RUBY_VERSION} as base

# Rails app lives here
WORKDIR /rails

# Set production environment
ENV RAILS_ENV="development" 
    BUNDLE_DEPLOYMENT="1" 
    BUNDLE_PATH="/usr/local/bundle" 
    BUNDLE_WITHOUT="development"


# Throw-away build stage to reduce size of final image
FROM base as build

# Install packages needed to build gems and node modules
RUN apt-get update -qq && 
    apt-get install --no-install-recommends -y build-essential curl git libpq-dev libvips node-gyp pkg-config python-is-python3 gnupg2

# Install JavaScript dependencies
ARG NODE_VERSION=18.19.1
ARG YARN_VERSION=1.22.22
ENV PATH=/usr/local/node/bin:$PATH
RUN curl -sL https://github.com/nodenv/node-build/archive/master.tar.gz | tar xz -C /tmp/ && 
    /tmp/node-build-master/bin/node-build "${NODE_VERSION}" /usr/local/node && 
    # npm install -g yarn@$YARN_VERSION && 
    rm -rf /tmp/node-build-master

RUN echo "Installing yarn"
RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg -o /root/yarn-pubkey.gpg && apt-key add /root/yarn-pubkey.gpg
RUN echo "deb https://dl.yarnpkg.com/debian/ stable main" > /etc/apt/sources.list.d/yarn.list
RUN apt-get update && apt-get install -y --no-install-recommends nodejs yarn

# Install application gems
COPY Gemfile Gemfile.lock ./
RUN bundle install && 
    rm -rf ~/.bundle/ "${BUNDLE_PATH}"/ruby/*/cache "${BUNDLE_PATH}"/ruby/*/bundler/gems/*/.git
RUN bundle exec bootsnap precompile --gemfile

# Install node modules
COPY package.json yarn.lock ./
RUN yarn install --frozen-lockfile

# Copy application code
RUN gem update --system
COPY . .

# Precompile bootsnap code for faster boot times
RUN bundle exec bootsnap precompile app/ lib/

# Precompiling assets for production without requiring secret RAILS_MASTER_KEY
# RUN SECRET_KEY_BASE_DUMMY=1 ./bin/rails assets:precompile

# Final stage for app image
FROM base

# Install packages needed for deployment
RUN apt-get update -qq && 
  apt-get install --no-install-recommends -y curl libvips postgresql-client && 
  rm -rf /var/lib/apt/lists /var/cache/apt/archives

# Copy built artifacts: gems, application
COPY --from=build /usr/local/bundle /usr/local/bundle
COPY --from=build /rails /rails

# Run and own only the runtime files as a non-root user for security
# RUN useradd rails --create-home --shell /bin/bash && 
#     chown -R rails:rails db log storage tmp
# USER rails:rails

# Entrypoint prepares the database.
ENTRYPOINT ["/rails/bin/docker-entrypoint"]

# Start the server by default, this can be overwritten at runtime
EXPOSE 3000
# CMD ["./bin/rails", "server"]

docker-compose

services:
  web:
    build: .
    command: sh -c "rm -f tmp/pids/server.pid && bin/dev"
    volumes:
      - .:/rails
      - /rails/node_modules
    ports:
      - "3000:3000"
      - "8082:8082"
    env_file:
      - rails.env
    depends_on:
      db:
        condition: service_healthy
      redis:
        condition: service_started
    stdin_open: true
    tty: true

  db:
    image: postgres:15
    expose:
      - "5432"
    ports:
      - "5432:5432"
    env_file:
      - rails.env
    volumes:
      - pg_data:/var/lib/postgresql/data
    healthcheck:
      test: pg_isready -U postgres
      interval: 2s
      timeout: 5s
      retries: 30

  redis:
    image: redis
    ports:
      - "6379:6379"
    volumes:
      - redis_data:/data

volumes:
  pg_data:
  redis_data:

I’ve adjusted the original to get yarn from dl.yarnpkg.com rather than using npm (which didn’t work either). When the container starts up I constantly get unknown command: yarn build:css --watch not found and running yarn --version get a yarn: not found.