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Dockerfile
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# syntax = docker/dockerfile:1
### START of FLY ####
# Make sure RUBY_VERSION matches the Ruby version in .ruby-version and Gemfile
ARG RUBY_VERSION=3.3.5
FROM quay.io/evl.ms/fullstaq-ruby:${RUBY_VERSION}-jemalloc-slim as base-for-fly
LABEL fly_launch_runtime="rails"
# 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-for-fly as build
# Install packages needed to build gems
RUN --mount=type=cache,id=dev-apt-cache,sharing=locked,target=/var/cache/apt \
--mount=type=cache,id=dev-apt-lib,sharing=locked,target=/var/lib/apt \
apt-get update -qq && \
apt-get install --no-install-recommends -y git build-essential libpq-dev libvips libyaml-dev
# Install application gems
COPY --link Gemfile Gemfile.lock .ruby-version ./
RUN --mount=type=cache,id=bld-gem-cache,sharing=locked,target=/srv/vendor \
bundle config set app_config .bundle && \
bundle config set path /srv/vendor && \
bundle install && \
bundle exec bootsnap precompile --gemfile && \
bundle clean && \
mkdir -p vendor && \
bundle config set path vendor && \
cp -ar /srv/vendor .
# Copy application code
COPY --link . .
# Precompile bootsnap code for faster boot times
RUN bundle exec bootsnap precompile app/ lib/
# Adjust binfiles to set current working directory
RUN grep -l '#!/usr/bin/env ruby' /rails/bin/* | xargs sed -i '/^#!/aDir.chdir File.expand_path("..", __dir__)'
# 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-for-fly AS fly-production
# Install packages needed for deployment
RUN --mount=type=cache,id=dev-apt-cache,sharing=locked,target=/var/cache/apt \
--mount=type=cache,id=dev-apt-lib,sharing=locked,target=/var/lib/apt \
apt-get update -qq && \
apt-get install --no-install-recommends -y curl imagemagick libvips postgresql-client
# Copy built artifacts: gems, application
COPY --from=build "${BUNDLE_PATH}" "${BUNDLE_PATH}"
COPY --from=build /rails /rails
# Run and own only the runtime files as a non-root user for security
RUN groupadd --system --gid 1000 rails && \
useradd rails --uid 1000 --gid 1000 --create-home --shell /bin/bash && \
chown -R 1000:1000 db log storage tmp
USER 1000:1000
# Deployment options
ENV RUBY_YJIT_ENABLE="1"
# Entrypoint sets up the container.
ENTRYPOINT ["/rails/bin/docker-entrypoint"]
# Start the server by default, this can be overwritten at runtime
EXPOSE 3000
#### END of FLY ####
#### START of DEV ####
# RUBY_VERSION is the only thing used from anything above
FROM ruby:${RUBY_VERSION}-alpine AS development
RUN apk add --no-cache bash git build-base postgresql-dev curl-dev gcompat tzdata vips-dev imagemagick
ENV BUNDLE_CACHE=/tmp/bundle \
BUNDLE_JOBS=2 \
PORT=3000
WORKDIR /rails
COPY Gemfile Gemfile.lock .ruby-version ./
RUN --mount=type=cache,id=gems,target=/tmp/bundle \
bundle install
RUN apk add --no-cache postgresql-client
ENTRYPOINT ["/rails/bin/docker-entrypoint"]
CMD ["./bin/dev"]
#### END of DEV ####
#### START of RENDER ####
# Render must be last because render.yml cannot specify a build target so it default to the last one
# RUBY_VERSION is the only thing used from anything above
FROM ruby:${RUBY_VERSION}-alpine AS render-production
RUN apk add --no-cache git build-base postgresql-dev curl-dev gcompat tzdata vips-dev imagemagick
WORKDIR /rails
COPY Gemfile Gemfile.lock .ruby-version ./
ENV BUNDLE_CACHE=/tmp/bundle \
BUNDLE_JOBS=2 \
BUNDLE_DEPLOYMENT=1 \
BUNDLE_WITHOUT=development \
RAILS_ENV=production \
PORT=8080
RUN --mount=type=cache,id=gems,target=/tmp/bundle \
bundle install
COPY . .
# Precompiling assets for production without requiring secret RAILS_MASTER_KEY
RUN bundle exec bootsnap precompile --gemfile app/ lib/
RUN SECRET_KEY_BASE_DUMMY=1 ./bin/rails assets:precompile
RUN mkdir -p log tmp bin
RUN adduser rails -D -h /rails -s /bin/sh && \
chown -R rails:rails db log tmp bin && \
chmod 755 /rails/bin/docker-entrypoint
USER rails:rails
ENTRYPOINT ["/rails/bin/docker-entrypoint"]
CMD ["./bin/rails", "server", "-b", "0.0.0.0"]
#### END of RENDER ####