Unicorn support added

Gemfile

@@ -7,3 +7,7 @@ gem "erubis"
 gem "haml"
 gem "pdfkit"
 gem "pg"
+
+group :production do
+  gem 'unicorn'
+end

Gemfile.lock

@@ -17,6 +17,7 @@ GEM
     erubis (2.6.6)
       abstract (>= 1.0.0)
     haml (3.0.21)
+    kgio (2.6.0)
     pdfkit (0.4.6)
     pg (0.10.1)
     rack (1.1.0)
@@ -27,7 +28,12 @@ GEM
       activeresource (= 2.3.8)
       activesupport (= 2.3.8)
       rake (>= 0.8.3)
+    raindrops (0.8.0)
     rake (0.8.7)
+    unicorn (4.1.1)
+      kgio (~> 2.4)
+      rack
+      raindrops (~> 0.6)
     warden (0.10.7)
       rack (>= 1.0.0)
 
@@ -41,3 +47,4 @@ DEPENDENCIES
   pdfkit
   pg
   rails (= 2.3.8)
+  unicorn

config/unicorn.rb

@@ -0,0 +1,53 @@
+deploy_to  = "/srv/taurus"
+rails_root = "#{deploy_to}/current"
+pid_file   = "#{deploy_to}/shared/pids/unicorn.pid"
+socket_file= "#{deploy_to}/shared/pids/unicorn.sock"
+log_file   = "#{rails_root}/log/unicorn.log"
+err_log    = "#{rails_root}/log/unicorn_error.log"
+old_pid    = pid_file + '.oldbin'
+
+timeout 60
+worker_processes 4
+listen socket_file, :backlog => 2048
+pid pid_file
+stderr_path err_log
+stdout_path log_file
+
+preload_app true
+
+GC.copy_on_write_friendly = true if GC.respond_to?(:copy_on_write_friendly=)
+
+before_exec do |server|
+  ENV["BUNDLE_GEMFILE"] = "#{rails_root}/Gemfile"
+end
+
+before_fork do |server, worker|
+  # the following is highly recomended for Rails + "preload_app true"
+  # as there's no need for the master process to hold a connection
+  defined?(ActiveRecord::Base) and
+  ActiveRecord::Base.connection.disconnect!
+
+  ##
+  # When sent a USR2, Unicorn will suffix its pidfile with .oldbin and
+  # immediately start loading up a new version of itself (loaded with a new
+  # version of our app). When this new Unicorn is completely loaded
+  # it will begin spawning workers. The first worker spawned will check to
+  # see if an .oldbin pidfile exists. If so, this means we've just booted up
+  # a new Unicorn and need to tell the old one that it can now die. To do so
+  # we send it a QUIT.
+  #
+  # Using this method we get 0 downtime deploys.
+
+  if File.exists?(old_pid) && server.pid != old_pid
+    begin
+      Process.kill("QUIT", File.read(old_pid).to_i)
+    rescue Errno::ENOENT, Errno::ESRCH
+      # someone else did our job for us
+    end
+  end
+end
+
+after_fork do |server, worker|
+  defined?(ActiveRecord::Base) and
+  ActiveRecord::Base.establish_connection
+end