Deploy rails application on apache passenger

http://nathanhoad.net/how-to-ruby-on-rails-ubuntu-apache-with-passenger
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1. sudo apt-get install ruby-full build-essential

2. sudo apt-get install apache2 apache2-mpm-prefork apache2-prefork-dev 

sudo gem install passenger
sudo passenger-install-apache2-module

The passenger-install-apache2-module script will guide you through what you need to do to get Passenger working. It should tell you to copy these lines into your /etc/apache2/apache2.conf:
LoadModule passenger_module /usr/lib/ruby/gems/1.8/gems/passenger-2.2.2/ext/apache2/mod_passenger.so PassengerRoot /usr/lib/ruby/gems/1.8/gems/passenger-2.2.2 PassengerRuby /usr/bin/ruby1.8