🚀 Merge Rails 8.1 dockerfile changes

Dockerfile

@@ -17,13 +17,15 @@ WORKDIR /rails
 # Install base packages
 RUN apt-get update -qq && \
     apt-get install --no-install-recommends -y curl libjemalloc2 libvips postgresql-client && \
+    ln -s /usr/lib/$(uname -m)-linux-gnu/libjemalloc.so.2 /usr/local/lib/libjemalloc.so && \
     rm -rf /var/lib/apt/lists /var/cache/apt/archives
 
-# Set production environment
+# Set production environment variables and enable jemalloc for reduced memory usage and latency.
 ENV RAILS_ENV="production" \
     BUNDLE_DEPLOYMENT="1" \
     BUNDLE_PATH="/usr/local/bundle" \
-    BUNDLE_WITHOUT="development"
+    BUNDLE_WITHOUT="development" \
+    LD_PRELOAD="/usr/local/lib/libjemalloc.so"
 
 # Throw-away build stage to reduce size of final image
 FROM base AS build
@@ -34,16 +36,19 @@ RUN apt-get update -qq && \
     rm -rf /var/lib/apt/lists /var/cache/apt/archives
 
 # Install application gems
-COPY Gemfile Gemfile.lock ./
+COPY Gemfile Gemfile.lock vendor ./
+
 RUN bundle install && \
     rm -rf ~/.bundle/ "${BUNDLE_PATH}"/ruby/*/cache "${BUNDLE_PATH}"/ruby/*/bundler/gems/*/.git && \
-    bundle exec bootsnap precompile --gemfile
+    # -j 1 disable parallel compilation to avoid a QEMU bug: https://github.com/rails/bootsnap/issues/495
+    bundle exec bootsnap precompile -j 1 --gemfile
 
 # Copy application code
 COPY . .
 
-# Precompile bootsnap code for faster boot times
-RUN bundle exec bootsnap precompile app/ lib/
+# Precompile bootsnap code for faster boot times.
+# -j 1 disable parallel compilation to avoid a QEMU bug: https://github.com/rails/bootsnap/issues/495
+RUN bundle exec bootsnap precompile -j 1 app/ lib/
 
 # Precompiling assets for production without requiring secret RAILS_MASTER_KEY
 RUN SECRET_KEY_BASE_DUMMY=1 ./bin/rails assets:precompile
@@ -54,16 +59,15 @@ RUN SECRET_KEY_BASE_DUMMY=1 ./bin/rails assets:precompile
 # Final stage for app image
 FROM base
 
-# 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
+    useradd rails --uid 1000 --gid 1000 --create-home --shell /bin/bash
 USER 1000:1000
 
+# Copy built artifacts: gems, application
+COPY --chown=rails:rails --from=build "${BUNDLE_PATH}" "${BUNDLE_PATH}"
+COPY --chown=rails:rails --from=build /rails /rails
+
 # Entrypoint prepares the database.
 ENTRYPOINT ["/rails/bin/docker-entrypoint"]
 

bin/docker-entrypoint

@@ -1,11 +1,5 @@
 #!/bin/bash -e
 
-# Enable jemalloc for reduced memory usage and latency.
-if [ -z "${LD_PRELOAD+x}" ]; then
-    LD_PRELOAD=$(find /usr/lib -name libjemalloc.so.2 -print -quit)
-    export LD_PRELOAD
-fi
-
 # If running the rails server then create or migrate existing database
 if [ "${@: -2:1}" == "./bin/rails" ] && [ "${@: -1:1}" == "server" ]; then
   ./bin/rails db:prepare