install ruby

install-ruby.txt

bash < <( curl http://rvm.beginrescueend.com/releases/rvm-install-latest )
rvm install 1.8.7
rvm use 1.8.7 --default

yum install gcc-c++
gem install passenger
cd /usr/local/rvm/gems/ruby-1.8.7-p302/gems/passenger-2.2.15/bin
./passenger-install-apache2-module --apxs2-path=/usr/local/apache2.2.16/bin/apxs --apr-config-path=/usr/local/apache2.2.16/bin/apr-1-config 

LoadModule passenger_module /usr/local/rvm/gems/ruby-1.8.7-p302/gems/passenger-2.2.15/ext/apache2/mod_passenger.so
PassengerRoot /usr/local/rvm/gems/ruby-1.8.7-p302/gems/passenger-2.2.15
PassengerRuby /usr/local/rvm/rubies/ruby-1.8.7-p302/bin/ruby

Suppose you have a Rails application in /somewhere. Add a virtual host to your
Apache configuration file and set its DocumentRoot to /somewhere/public:

   <VirtualHost *:80>
      ServerName www.yourhost.com
      DocumentRoot /somewhere/public    # <-- be sure to point to 'public'!
      <Directory /somewhere/public>
         AllowOverride all              # <-- relax Apache security settings
         Options -MultiViews            # <-- MultiViews must be turned off
      </Directory>
   </VirtualHost>