Deploy gitlab with apache2 and unicorn in another port

gistfile1.txt

#1, reference 
    https://gitlab.com/gitlab-org/gitlab-recipes/raw/master/web-server/apache/gitlab-apache2.4.conf
    http://serverfault.com/questions/512527/gitlab-with-apache-proxy
    i created the following vhost configuration

#2, modify /home/git/gitlab/config/unicorn.rb:
    comment the line like which listen through the socket and make sure it's listening through tcp port
    
    # listen "/home/git/gitlab/tmp/sockets/gitlab.socket", :backlog => 64
    listen "localhost:20000", :tcp_nopush => true"
    here I'm using 20000 as the port as 8080 has been taken by Tomcat already

#3, !important!, modify /home/git/gitlab/config/unicorn.rb:
    change the 'timeout' value to a larger value, e.g. 300, which means 300s
    it needs quite a long time for first time access, otherwise you will end up with timeout in unicorn worker process.
    (the error message can be checked in /home/git/gitlab/log/unicorn_stderr.log)
    from the web you will see 'proxy error' 'no response from /users/sign_in' etc.
    
    reference:http://radiumblue.net/blog/2013/01/18/unicorn-error-gitlab-configuration/
  
#4, restart gitlab and apache2
    sudo service gitlab restart
    sudo service apache2 restart

gistfile2.txt

This configuration has been tested on GitLab 6.5.0
#Note this config assumes unicorn is listening on default port 20000.
#Module dependencies
#  mod_rewrite
#  mod_proxy
#  mod_proxy_http
<VirtualHost *:80>
  ServerName git.xxx.com
  ServerSignature Off

  ProxyRequests Off
  ProxyPreserveHost On
  ProxyPass / http://localhost:20000/

  <Location />
    # New authorization commands for apache 2.4 and up
    # http://httpd.apache.org/docs/2.4/upgrading.html#access
    Order allow,deny
    Allow from all
    ProxyPassReverse /
  </Location>

  #apache equivalent of nginx try files
  # http://serverfault.com/questions/290784/what-is-apaches-equivalent-of-nginxs-try-files
  # http://stackoverflow.com/questions/10954516/apache2-proxypass-for-rails-app-gitlab
  RewriteEngine on
  RewriteCond %{DOCUMENT_ROOT}/%{REQUEST_FILENAME} !-f
  RewriteRule .* http://localhost:20000%{REQUEST_URI} [P,QSA]
   # needed for downloading attachments
  DocumentRoot /home/git/gitlab/public

  #Set up apache error documents, if back end goes down (i.e. 503 error) then a maintenance/deploy page is thrown up.
  ErrorDocument 404 /404.html
  ErrorDocument 422 /422.html
  ErrorDocument 500 /500.html
  ErrorDocument 503 /deploy.html

  LogFormat "%{X-Forwarded-For}i %l %u %t \"%r\" %>s %b" common_forwarded
  ErrorLog  /var/www/git.xxx.com/logs/error.log
  CustomLog /var/www/git.xxx.com/logs/access.log common_forwarded
  CustomLog /var/www/git.xxx.com/logs/access.log combined
</VirtualHost>