diff --git a/Gemfile b/Gemfile
index 0150ffb94ea6a5230040e602843a1f7e2a82dd8d..089646e110cd9eb842ddbef06ce6052281c06a62 100644
--- a/Gemfile
+++ b/Gemfile
@@ -59,8 +59,9 @@ gem "haml-rails"
 
 # Files attachments
 gem "carrierwave"
+
 # for aws storage
-# gem "fog", "~> 1.3.1"
+gem "fog", "~> 1.3.1", group: :aws
 
 # Authorization
 gem "six"
@@ -76,7 +77,8 @@ gem "github-markup", "~> 0.7.4", require: 'github/markup'
 gem  "asciidoctor"
 
 # Servers
-gem "puma", '~> 2.0.1'
+gem "puma", '~> 2.3.1', group: :puma
+gem "unicorn", '~> 4.6.3', group: :unicorn
 
 # State machine
 gem "state_machine"
diff --git a/Gemfile.lock b/Gemfile.lock
index 313d2ffbca56596f468d3e88706f4c6687963e30..d26f4d8a28fb256d6eb0381ce2b49c8bc7393327 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -116,6 +116,7 @@ GEM
     erubis (2.7.0)
     escape_utils (0.2.4)
     eventmachine (1.0.3)
+    excon (0.13.4)
     execjs (1.4.0)
       multi_json (~> 1.0)
     factory_girl (4.2.0)
@@ -131,6 +132,16 @@ GEM
       eventmachine (>= 0.12.0)
     ffaker (1.16.0)
     ffi (1.8.1)
+    fog (1.3.1)
+      builder
+      excon (~> 0.13.0)
+      formatador (~> 0.2.0)
+      mime-types
+      multi_json (~> 1.0)
+      net-scp (~> 1.0.4)
+      net-ssh (>= 2.1.3)
+      nokogiri (~> 1.5.0)
+      ruby-hmac
     font-awesome-rails (3.1.1.3)
       railties (>= 3.2, < 5.0)
     foreman (0.63.0)
@@ -243,6 +254,7 @@ GEM
     kaminari (0.14.1)
       actionpack (>= 3.0.0)
       activesupport (>= 3.0.0)
+    kgio (2.8.0)
     launchy (2.2.0)
       addressable (~> 2.3)
     letter_opener (1.1.0)
@@ -267,6 +279,9 @@ GEM
     multipart-post (1.2.0)
     mysql2 (0.3.11)
     net-ldap (0.3.1)
+    net-scp (1.0.4)
+      net-ssh (>= 1.99.1)
+    net-ssh (2.6.8)
     nokogiri (1.5.9)
     oauth (0.4.7)
     oauth2 (0.8.1)
@@ -305,7 +320,7 @@ GEM
       coderay (~> 1.0.5)
       method_source (~> 0.8)
       slop (~> 3.4)
-    puma (2.0.1)
+    puma (2.3.1)
       rack (>= 1.1, < 2.0)
     pygments.rb (0.4.2)
       posix-spawn (~> 0.3.6)
@@ -354,6 +369,7 @@ GEM
       rake (>= 0.8.7)
       rdoc (~> 3.4)
       thor (>= 0.14.6, < 2.0)
+    raindrops (0.11.0)
     rake (10.0.4)
     rb-fsevent (0.9.3)
     rb-inotify (0.9.0)
@@ -400,6 +416,7 @@ GEM
       rspec-core (~> 2.13.0)
       rspec-expectations (~> 2.13.0)
       rspec-mocks (~> 2.13.0)
+    ruby-hmac (0.4.0)
     ruby-progressbar (1.0.2)
     rubyntlm (0.1.1)
     rubyzip (0.9.9)
@@ -499,6 +516,10 @@ GEM
       execjs (>= 0.3.0)
       multi_json (~> 1.0, >= 1.0.2)
     underscore-rails (1.4.4)
+    unicorn (4.6.3)
+      kgio (~> 2.6)
+      rack
+      raindrops (~> 0.7)
     virtus (0.5.4)
       backports (~> 2.6.1)
       descendants_tracker (~> 0.0.1)
@@ -536,6 +557,7 @@ DEPENDENCIES
   enumerize
   factory_girl_rails
   ffaker
+  fog (~> 1.3.1)
   font-awesome-rails (~> 3.1.1)
   foreman
   gemoji (~> 1.2.1)
@@ -574,7 +596,7 @@ DEPENDENCIES
   pg
   poltergeist (~> 1.3.0)
   pry
-  puma (~> 2.0.1)
+  puma (~> 2.3.1)
   quiet_assets (~> 1.0.1)
   rack-mini-profiler
   rails (= 3.2.13)
@@ -608,4 +630,5 @@ DEPENDENCIES
   turbolinks
   uglifier
   underscore-rails (~> 1.4.4)
+  unicorn (~> 4.6.3)
   webmock
diff --git a/config/unicorn.rb.example b/config/unicorn.rb.example
new file mode 100644
index 0000000000000000000000000000000000000000..00c509dd829aa2d23b27c181ea2a827ddd01ee82
--- /dev/null
+++ b/config/unicorn.rb.example
@@ -0,0 +1,102 @@
+# Sample verbose configuration file for Unicorn (not Rack)
+#
+# This configuration file documents many features of Unicorn
+# that may not be needed for some applications. See
+# http://unicorn.bogomips.org/examples/unicorn.conf.minimal.rb
+# for a much simpler configuration file.
+#
+# See http://unicorn.bogomips.org/Unicorn/Configurator.html for complete
+# documentation.
+
+# Use at least one worker per core if you're on a dedicated server,
+# more will usually help for _short_ waits on databases/caches.
+worker_processes 2
+
+# Since Unicorn is never exposed to outside clients, it does not need to
+# run on the standard HTTP port (80), there is no reason to start Unicorn
+# as root unless it's from system init scripts.
+# If running the master process as root and the workers as an unprivileged
+# user, do this to switch euid/egid in the workers (also chowns logs):
+# user "unprivileged_user", "unprivileged_group"
+
+# Help ensure your application will always spawn in the symlinked
+# "current" directory that Capistrano sets up.
+working_directory "/home/git/gitlab/current" # available in 0.94.0+
+
+# listen on both a Unix domain socket and a TCP port,
+# we use a shorter backlog for quicker failover when busy
+listen "/home/git/gitlab/tmp/sockets/gitlab.socket", :backlog => 64
+listen 8080, :tcp_nopush => true
+
+# nuke workers after 30 seconds instead of 60 seconds (the default)
+timeout 30
+
+# feel free to point this anywhere accessible on the filesystem
+pid "/home/git/gitlab/tmp/pids/unicorn.pid"
+
+# By default, the Unicorn logger will write to stderr.
+# Additionally, ome applications/frameworks log to stderr or stdout,
+# so prevent them from going to /dev/null when daemonized here:
+stderr_path "/home/git/gitlab/log/unicorn.stderr.log"
+stdout_path "/home/git/gitlab/log/unicorn.stdout.log"
+
+# combine Ruby 2.0.0dev or REE with "preload_app true" for memory savings
+# http://rubyenterpriseedition.com/faq.html#adapt_apps_for_cow
+preload_app true
+GC.respond_to?(:copy_on_write_friendly=) and
+  GC.copy_on_write_friendly = true
+
+# Enable this flag to have unicorn test client connections by writing the
+# beginning of the HTTP headers before calling the application.  This
+# prevents calling the application for connections that have disconnected
+# while queued.  This is only guaranteed to detect clients on the same
+# host unicorn runs on, and unlikely to detect disconnects even on a
+# fast LAN.
+check_client_connection false
+
+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!
+
+  # The following is only recommended for memory/DB-constrained
+  # installations.  It is not needed if your system can house
+  # twice as many worker_processes as you have configured.
+  #
+  # # This allows a new master process to incrementally
+  # # phase out the old master process with SIGTTOU to avoid a
+  # # thundering herd (especially in the "preload_app false" case)
+  # # when doing a transparent upgrade.  The last worker spawned
+  # # will then kill off the old master process with a SIGQUIT.
+  # old_pid = "#{server.config[:pid]}.oldbin"
+  # if old_pid != server.pid
+  #   begin
+  #     sig = (worker.nr + 1) >= server.worker_processes ? :QUIT : :TTOU
+  #     Process.kill(sig, File.read(old_pid).to_i)
+  #   rescue Errno::ENOENT, Errno::ESRCH
+  #   end
+  # end
+  #
+  # Throttle the master from forking too quickly by sleeping.  Due
+  # to the implementation of standard Unix signal handlers, this
+  # helps (but does not completely) prevent identical, repeated signals
+  # from being lost when the receiving process is busy.
+  # sleep 1
+end
+
+after_fork do |server, worker|
+  # per-process listener ports for debugging/admin/migrations
+  # addr = "127.0.0.1:#{9293 + worker.nr}"
+  # server.listen(addr, :tries => -1, :delay => 5, :tcp_nopush => true)
+
+  # the following is *required* for Rails + "preload_app true",
+  defined?(ActiveRecord::Base) and
+    ActiveRecord::Base.establish_connection
+
+  # if preload_app is true, then you may also want to check and
+  # restart any other shared sockets/descriptors such as Memcached,
+  # and Redis.  TokyoCabinet file handles are safe to reuse
+  # between any number of forked children (assuming your kernel
+  # correctly implements pread()/pwrite() system calls)
+end
diff --git a/doc/install/installation.md b/doc/install/installation.md
index 146f45f7cd600392a0048c85272aab07873ebff4..800e06fdfdf4e1994ecf133d8e25a4378907b57d 100644
--- a/doc/install/installation.md
+++ b/doc/install/installation.md
@@ -226,10 +226,10 @@ Make sure to edit both `gitlab.yml` and `puma.rb` to match your setup.
     sudo gem install charlock_holmes --version '0.6.9.4'
 
     # For MySQL (note, the option says "without ... postgres")
-    sudo -u git -H bundle install --deployment --without development test postgres
+    sudo -u git -H bundle install --deployment --without development test postgres unicorn aws
 
     # Or for PostgreSQL (note, the option says "without ... mysql")
-    sudo -u git -H bundle install --deployment --without development test mysql
+    sudo -u git -H bundle install --deployment --without development test mysql unicorn aws
 
 
 ## Initialize Database and Activate Advanced Features