Optimized Dockerfile and Updated the Project (#14)

Author: fabsau

.dockerignore

@@ -0,0 +1,10 @@
+# .dockerignore
+.github/
+.idea/
+examples/
+README.md
+LICENSE
+.git/
+*.md
+*.yml
+Dockerfile

Dockerfile

@@ -1,20 +1,52 @@
-FROM ruby:3.0.5
+# The first stage is dedicated to building the application
+FROM ruby:3.2.2-alpine as BUILD
 
-MAINTAINER James Hu <[email protected]>
-
-ENV PORT 9594
-ENV ROOT /srv
-RUN mkdir -p $ROOT
+ENV PORT=9594 \
+    USER=app \
+    GROUP=appgroup \
+    ROOT=/srv
 
 WORKDIR $ROOT
 
-COPY Gemfile $ROOT
-COPY Gemfile.lock $ROOT
+# Updating system packages and installing dependencies
+RUN apk update && apk upgrade && \
+    apk add --update --no-cache --virtual .build-deps \
+    build-base \
+    libffi-dev \
+    ruby-dev
+
+# Copy the Gemfile and Gemfile.lock
+COPY Gemfile Gemfile.lock $ROOT/
+
+# Run the specific version of bundle to install all the necessary libraries
+RUN gem install bundler && \
+    bundle install && \
+    apk del .build-deps && \
+    rm -rf /usr/local/bundle/cache/*.gem && \
+    find /usr/local/bundle/gems/ -name "*.c" -delete && \
+    find /usr/local/bundle/gems/ -name "*.o" -delete
+
+COPY . $ROOT/
 
-RUN bundle install
+# The second stage is responsible for preparing the runtime
+FROM ruby:3.2.2-alpine as RUNTIME
+
+# Copy over files from the BUILD step
+COPY --from=BUILD $ROOT $ROOT
+
+# Set environmental variables
+ENV PORT=9594 \
+    USER=app \
+    GROUP=appgroup \
+    ROOT=/srv
+
+WORKDIR $ROOT
 
-COPY . $ROOT
+RUN addgroup -S $GROUP && \
+    adduser -S $USER -G $GROUP && \
+    chown -R $USER:$GROUP $ROOT && \
+    chmod 755 config.ru
 
-RUN chmod +x config.ru
+USER $USER:$GROUP
 
-CMD bundle exec puma --port $PORT
+CMD bundle exec puma -b tcp://0.0.0.0:$PORT

Gemfile

@@ -1,9 +1,9 @@
 source "https://rubygems.org"
 git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
-ruby "3.0.5"
+ruby "3.2.2"
 
-gem "http", "5.1.0"
-gem "prometheus-client", "4.0.0"
-gem "puma", "6.0.0"
-gem "rack", "3.0.1"
+gem "http", "~> 5.1.1"
+gem "prometheus-client", "~> 4.2.2"
+gem "puma", "~> 6.4.0"
+gem "rack", "~> 3.0.8"

Gemfile.lock

@@ -1,15 +1,15 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.8.1)
+    addressable (2.8.6)
       public_suffix (>= 2.0.2, < 6.0)
-    domain_name (0.5.20190701)
-      unf (>= 0.0.5, < 1.0.0)
-    ffi (1.15.5)
+    domain_name (0.6.20231109)
+    ffi (1.16.3)
+    ffi (1.16.3-x64-mingw-ucrt)
     ffi-compiler (1.0.1)
       ffi (>= 1.0.0)
       rake
-    http (5.1.0)
+    http (5.1.1)
       addressable (~> 2.8)
       http-cookie (~> 1.0)
       http-form_data (~> 2.2)
@@ -20,29 +20,27 @@ GEM
     llhttp-ffi (0.4.0)
       ffi-compiler (~> 1.0)
       rake (~> 13.0)
-    nio4r (2.5.8)
-    prometheus-client (4.0.0)
-    public_suffix (5.0.0)
-    puma (6.0.0)
+    nio4r (2.7.0)
+    prometheus-client (4.2.2)
+    public_suffix (5.0.4)
+    puma (6.4.0)
       nio4r (~> 2.0)
-    rack (3.0.1)
-    rake (13.0.6)
-    unf (0.1.4)
-      unf_ext
-    unf_ext (0.0.8.2)
+    rack (3.0.8)
+    rake (13.1.0)
 
 PLATFORMS
   aarch64-linux
   arm64-darwin-21
+  x64-mingw-ucrt
 
 DEPENDENCIES
-  http (= 5.1.0)
-  prometheus-client (= 4.0.0)
-  puma (= 6.0.0)
-  rack (= 3.0.1)
+  http
+  prometheus-client
+  puma
+  rack
 
 RUBY VERSION
-   ruby 3.0.5p211
+   ruby 3.2.2p53
 
 BUNDLED WITH
-   2.2.33
+   2.5.3