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Dockerfile
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Dockerfile
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# syntax = docker/dockerfile:1
FROM debian:bullseye-slim as base
# Install dependencies for building Ruby
RUN apt-get update && apt-get install -y build-essential wget autoconf
# Install ruby-install for installing Ruby
RUN wget https://github.com/postmodern/ruby-install/releases/download/v0.9.3/ruby-install-0.9.3.tar.gz \
&& tar -xzvf ruby-install-0.9.3.tar.gz \
&& cd ruby-install-0.9.3/ \
&& make install
# Install Ruby 3.3.0 with the https://github.com/ruby/ruby/pull/9371 patch
RUN ruby-install -p https://github.com/ruby/ruby/pull/9371.diff ruby 3.3.0
# Make the Ruby binary available on the PATH
ENV PATH="/opt/rubies/ruby-3.3.0/bin:${PATH}"
# Rails app lives here
WORKDIR /rails
# Set production environment
ENV BUNDLE_DEPLOYMENT="1" \
BUNDLE_PATH="/usr/local/bundle" \
BUNDLE_WITHOUT="development:test" \
RAILS_ENV="production"
# Update gems and bundler
RUN gem update --system --no-document && \
gem install -N bundler
# Throw-away build stage to reduce size of final image
FROM base as build
# Install packages needed to build gems
RUN apt-get update -qq && \
apt-get install --no-install-recommends -y build-essential git pkg-config
# Install application gems
COPY Gemfile Gemfile.lock ./
RUN bundle install && \
bundle exec bootsnap precompile --gemfile && \
rm -rf ~/.bundle/ "${BUNDLE_PATH}"/ruby/*/cache "${BUNDLE_PATH}"/ruby/*/bundler/gems/*/.git
# Copy application code
COPY . .
# Precompile bootsnap code for faster boot times
RUN bundle exec bootsnap precompile app/ lib/
# Precompiling assets for production without requiring secret RAILS_MASTER_KEY
RUN SECRET_KEY_BASE_DUMMY=1 ./bin/rails assets:precompile
# Final stage for app image
FROM base
# Install packages needed for deployment
RUN apt-get update -qq && \
apt-get install --no-install-recommends -y curl libjemalloc2 libsqlite3-0 && \
rm -rf /var/lib/apt/lists /var/cache/apt/archives
# Copy built artifacts: gems, application
COPY --from=build "${BUNDLE_PATH}" "${BUNDLE_PATH}"
COPY --from=build /rails /rails
# Run and own only the runtime files as a non-root user for security
RUN groupadd --system --gid 1000 rails && \
useradd rails --uid 1000 --gid 1000 --create-home --shell /bin/bash && \
chown -R 1000:1000 db log storage tmp
USER 1000:1000
# Deployment options
ENV LD_PRELOAD="libjemalloc.so.2" \
MALLOC_CONF="dirty_decay_ms:1000,narenas:2,background_thread:true"
# 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"]