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Dockerfile
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Dockerfile
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# syntax = docker/dockerfile:1
ARG RUBY_VERSION=3.3.4
FROM docker.io/library/ruby:$RUBY_VERSION-slim as base
# Rails app lives here
WORKDIR /rails
# Set production environment
ENV RAILS_ENV="production" \
BUNDLE_WITHOUT="development:test" \
BUNDLE_PATH="/usr/local/bundle" \
RAILS_SERVE_STATIC_FILES="true" \
RAILS_LOG_TO_STDOUT="true" \
FERRUM_DEFAULT_TIMEOUT="15" \
FERRUM_PROCESS_TIMEOUT="30"
# Throw-away build stage to reduce size of final image
FROM base AS build
# Install packages needed to build gems
RUN apt-get update -qq && \
apt-get install --no-install-recommends -y build-essential git pkg-config unzip libvips && \
rm -rf /var/lib/apt/lists /var/cache/apt/archives
# Install application gems
COPY Gemfile Gemfile.lock .ruby-version ./
RUN bundle install && \
rm -rf ~/.bundle/ "${BUNDLE_PATH}"/ruby/*/cache "${BUNDLE_PATH}"/ruby/*/bundler/gems/*/.git && \
bundle exec bootsnap precompile --gemfile
# Copy application code
COPY . .
# Precompile bootsnap code for faster boot times
RUN bundle exec bootsnap precompile app/ lib/
# Precompiling assets for production without requiring secret RAILS_MASTER_KEY
RUN SECRET_KEY_BASE_DUMMY=1 ./bin/rails assets:precompile
# Final stage for app image
FROM base
# Install base packages
RUN apt-get update -qq && \
apt-get install --no-install-recommends -y curl wget libjemalloc2 libsqlite3-0 libvips redis && \
rm -rf /var/lib/apt/lists /var/cache/apt/archives
ENV TMPDIR="/rails/tmp"
# Copy built artifacts: gems, application
COPY --from=build "${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 rails:rails db log storage tmp
USER 1000:1000
# Entrypoint prepares the database.
ENTRYPOINT ["/rails/bin/docker-entrypoint"]
# Start the server by default, this can be overwritten at runtime
EXPOSE 3000
VOLUME /rails/storage
CMD ["gem", "exec", "foreman", "start"]