68 lines
1.9 KiB
Docker
68 lines
1.9 KiB
Docker
# syntax = docker/dockerfile:1
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# Make sure RUBY_VERSION matches the Ruby version in .ruby-version and Gemfile
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ARG RUBY_VERSION=3.3.4
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FROM registry.docker.com/library/ruby:$RUBY_VERSION-slim as base
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# Rails app lives here
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WORKDIR /rails
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# Set production environment
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ENV RAILS_ENV="production" \
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BUNDLE_DEPLOYMENT="1" \
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BUNDLE_PATH="/usr/local/bundle" \
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BUNDLE_WITHOUT="development"
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# Throw-away build stage to reduce size of final image
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FROM base as build
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# Install packages needed to build gems
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RUN apt-get update -qq && \
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apt-get install --no-install-recommends -y build-essential git pkg-config
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# Install application gems
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COPY Gemfile Gemfile.lock ./
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RUN bundle install && \
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rm -rf ~/.bundle/ "${BUNDLE_PATH}"/ruby/*/cache "${BUNDLE_PATH}"/ruby/*/bundler/gems/*/.git && \
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bundle exec bootsnap precompile --gemfile
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# Copy application code
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COPY . .
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# Precompile bootsnap code for faster boot times
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RUN bundle exec bootsnap precompile app/ lib/
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# Adjust binfiles to be executable on Linux
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RUN chmod +x bin/* && \
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sed -i "s/\r$//g" bin/* && \
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sed -i 's/ruby\.exe$/ruby/' bin/*
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# Precompiling assets for production without requiring secret RAILS_MASTER_KEY
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RUN SECRET_KEY_BASE_DUMMY=1 ./bin/rails assets:precompile
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# Final stage for app image
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FROM base
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# Install packages needed for deployment
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RUN apt-get update -qq && \
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apt-get install --no-install-recommends -y curl libsqlite3-0 && \
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rm -rf /var/lib/apt/lists /var/cache/apt/archives
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# Copy built artifacts: gems, application
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COPY --from=build /usr/local/bundle /usr/local/bundle
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COPY --from=build /rails /rails
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# Run and own only the runtime files as a non-root user for security
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RUN useradd rails --create-home --shell /bin/bash && \
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chown -R rails:rails db log storage tmp
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USER rails:rails
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# Entrypoint prepares the database.
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ENTRYPOINT ["/rails/bin/docker-entrypoint"]
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# Start the server by default, this can be overwritten at runtime
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EXPOSE 3000
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CMD ["./bin/rails", "server"]
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