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+# example based on https://github.com/errm/fib
+
+FROM alpine:3.9 as build
+
+COPY Gemfile Gemfile.lock ./
+
+RUN apk add --no-cache ruby ruby-dev ruby-bundler ruby-json build-base bash \
+        && bundle install --frozen -j4 -r3 --no-cache --without development \
+        && apk del --no-cache ruby-bundler \
+        && rm -rf /usr/lib/ruby/gems/*/cache
+
+FROM alpine:3.9 as prod
+
+COPY --from=build /usr/lib/ruby/gems /usr/lib/ruby/gems
+RUN apk add --no-cache ruby ruby-json ruby-etc redis apache2-utils \
+        && ruby -e "Gem::Specification.map.each do |spec| \
+      Gem::Installer.for_spec( \
+        spec, \
+        wrappers: true, \
+        force: true, \
+        install_dir: spec.base_dir, \
+        build_args: spec.build_args, \
+      ).generate_bin \
+    end"
+
+WORKDIR /app
+COPY . /app/.
+
+ENV PORT=9292 \
+    WEB_CONCURRENCY=20 \
+    WEB_MAX_THREADS=20 \
+    RACK_ENV=production
+
+ENV host localhost
+EXPOSE $PORT
+USER nobody
+STOPSIGNAL SIGINT
+CMD ["sh", "-c", "/usr/bin/puma", "${host}"]