set ruby version (2.1.2), create Procfile

Gemfile

 source 'https://rubygems.org'
 
+ruby '2.1.2'
+
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem 'rails', '~> 4.1'
 

Gemfile.lock

@@ -190,111 +190,6 @@ GEM
     i18n_generators (1.2.1)
       mechanize
       rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
-      rails (>= 3.0.0)
     jbuilder (2.2.4)
       activesupport (>= 3.0.0, < 5)
       multi_json (~> 1.2)

Procfile

+web: bundle exec unicorn -p $PORT -c ./config/unicorn.rb

config/unicorn.rb

+worker_processes Integer(ENV["WEB_CONCURRENCY"] || 3)
+timeout 15
+preload_app true
+
+before_fork do |server, worker|
+  Signal.trap 'TERM' do
+    puts 'Unicorn master intercepting TERM and sending myself QUIT instead'
+    Process.kill 'QUIT', Process.pid
+  end
+
+  defined?(ActiveRecord::Base) and
+    ActiveRecord::Base.connection.disconnect!
+end
+
+after_fork do |server, worker|
+  Signal.trap 'TERM' do
+    puts 'Unicorn worker intercepting TERM and doing nothing. Wait for master to send QUIT'
+  end
+
+  defined?(ActiveRecord::Base) and
+    ActiveRecord::Base.establish_connection
+end