Ruby on Rails Deployments

18

Oh let’s get you a Dockerfile then. Rails is easy if you’re not using assets.

See if this works:

######################
# Stage: Gem Builder
FROM ruby:2.6.5 as Builder

ARG BUNDLE_WITHOUT="development test" 
ARG RAILS_ENV="production"

ENV BUNDLE_WITHOUT=${BUNDLE_WITHOUT}

RUN apt-get update && apt-get install -y \
  build-essential \
  postgresql-client \
  git \
  npm \
  tzdata \
  brotli \
  && rm -rf /var/lib/apt/lists/*

WORKDIR /app

# Install gems
ADD Gemfile* /app/
RUN bundle config --global frozen 1 \
  && bundle install -j4 --retry 3 \
  # Remove unneeded files (cached *.gem, *.o, *.c)
  && rm -rf /usr/local/bundle/cache/*.gem \
  && find /usr/local/bundle/gems/ -name "*.c" -delete \
  && find /usr/local/bundle/gems/ -name "*.o" -delete

###############################
# Stage Final
FROM ruby:2.6.5

RUN apt-get update && apt-get install -y \
  file \
  postgresql-client \
  tzdata \
  && rm -rf /var/lib/apt/lists/*

# Add user
RUN groupadd -r app && useradd -r -g app app

USER app

# Copy app with gems from former build stage
COPY --from=Builder /usr/local/bundle/ /usr/local/bundle/

USER root
RUN mkdir -p /app/tmp/pids && chown -R app:app /app/tmp
ADD --chown=app:app . /app

# Set Rails env
ENV RAILS_LOG_TO_STDOUT true
ENV RAILS_ENV production

USER app
WORKDIR /app

# Start up
CMD ["bundle", "exec", "puma", "-C", "config/puma.rb"]
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