Use Puma

Dockerfile

@@ -5,9 +5,9 @@ RUN apt-get update -qq && apt-get install -y nodejs imagemagick netcat
 RUN mkdir /myapp
 WORKDIR /myapp
 ADD Gemfile* /myapp/
-RUN bundle install
+RUN bundle install --jobs 4
 
 EXPOSE 3000
 ADD . /myapp
 
-CMD bundle exec unicorn -l 0.0.0.0:3000
+CMD bundle exec puma -b tcp://0.0.0.0 -p 3000 -t 5:16

Gemfile

@@ -58,7 +58,7 @@ gem 'browser'
 gem 'share_progress', '>=0.1.2', require: false
 
 gem 'newrelic_rpm'
-gem 'unicorn'
+gem 'puma'
 
 group :development, :test do
   gem 'byebug'

Gemfile.lock

@@ -139,7 +139,6 @@ GEM
     kaminari (0.16.3)
       actionpack (>= 3.0.0)
       activesupport (>= 3.0.0)
-    kgio (2.10.0)
     liquid (3.0.3)
     logger (1.2.8)
     loofah (2.0.2)
@@ -184,6 +183,7 @@ GEM
       mime-types
       mimemagic (= 0.3.0)
     pg (0.18.2)
+    puma (2.12.2)
     rack (1.6.4)
     rack-pjax (0.8.0)
       nokogiri (~> 1.5)
@@ -228,7 +228,6 @@ GEM
       activesupport (= 4.2.3)
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
-    raindrops (0.15.0)
     rake (10.4.2)
     rdoc (4.2.0)
     remotipart (1.2.1)
@@ -296,10 +295,6 @@ GEM
     uglifier (2.7.1)
       execjs (>= 0.3.0)
       json (>= 1.8.0)
-    unicorn (4.9.0)
-      kgio (~> 2.6)
-      rack
-      raindrops (~> 0.7)
     warden (1.2.3)
       rack (>= 1.0)
     web-console (2.2.1)
@@ -342,6 +337,7 @@ DEPENDENCIES
   paper_trail
   paperclip
   pg
+  puma
   rails (= 4.2.3)
   rails_admin
   remotipart (~> 1.2)
@@ -356,7 +352,6 @@ DEPENDENCIES
   spring
   timecop
   uglifier (>= 1.3.0)
-  unicorn
   web-console (~> 2.0)
   webmock