52 lines
1.5 KiB
Docker
52 lines
1.5 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=3.2.0
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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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# Copy application code
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COPY . .
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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 libjemalloc2 && \
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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 log tmp
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USER rails:rails
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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", "-b", "0.0.0.0"]
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