Adding additional config for production tcp listener

config/unicorn_tcp.rb

+require 'tmpdir'
+worker_processes Integer(ENV['WORKER_PROCESSES'] || 4)
+timeout 25
+preload_app true
+
+listen_host = ENV['LISTEN_HOST'] || '0.0.0.0'
+listen_port = ENV['LISTEN_PORT'] || '4567'
+listen "#{listen_host}:#{listen_port}", :tcp_nopush => true
+
+data_dir = ENV['DATA_DIR'] || Dir.tmpdir
+pid "#{data_dir}/forum_unicorn.pid"
+
+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
+end
+
+after_fork do |server, worker|
+  Signal.trap 'TERM' do
+    puts 'Unicorn worker intercepting TERM and doing nothing. Waiting for master to send QUIT'
+  end
+  ::Mongoid.default_session.disconnect
+end