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# 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=3.1.2 |
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FROM registry.docker.com/library/ruby:$RUBY_VERSION-slim as base |
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# Rails app lives here |
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WORKDIR /rails |
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# Set production environment |
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ENV RAILS_ENV="production" \ |
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BUNDLE_DEPLOYMENT="1" \ |
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BUNDLE_PATH="/usr/local/bundle" \ |
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BUNDLE_WITHOUT="development" |
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# Throw-away build stage to reduce size of final image |
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FROM base as build |
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# Install packages needed to build gems |
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RUN apt-get update -qq && \ |
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apt-get install --no-install-recommends -y build-essential git libpq-dev libvips pkg-config |
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# Install application gems |
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COPY Gemfile Gemfile.lock ./ |
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RUN bundle install && \ |
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rm -rf ~/.bundle/ "${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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# 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 libvips postgresql-client && \ |
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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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