Installing Ruby on Rails 2.3.8 in CentOS 5.X

I have just re-installed Ruby on Rails on my CentOS 5.X machine. Good thing I don't delete my history on the browser and so I was able to find the tutorial I follow on how to do it.

So just in case this happens to me again, I'll be posting here the steps on how to do it.

1. Remove all ruby installed to your system. Type this at the console
   
   
   (NOTE: all the steps from here onward are entered as admin)
   
   

   yum list | grep installed | grep ruby

   
   Your server might return these lines after, although some may not be existing on your system:
   
   

   ruby.i386 1.8.5-5.el5_3.7 installed
   ruby-devel.i386 1.8.5-5.el5_3.7  installed
   ruby-libs.i386 1.8.5-5.el5_3.7 installed
   ruby-mode.i386 1.8.5-5.el5_3.7 installed
   

   
   Now we need to remove it in order to install a new one. To remove it just type the following:
   
   

   yum erase ruby
   yum erase ruby-devel
   yum erase ruby-libs
   yum erase ruby-mode

   
   
   NOTE: Unable to do so, will affect your ruby application.
   
   Based on experience, I accidentally re-installed my ruby and it causes my applications to stop working. It returns the following error:
   
   

   Rails requires RubyGems >= 1.3.2. Please install RubyGems and try  again: http://rubygems.rubyforge.org

   
   I'm still checking this, if multiple ruby installation is really the effect of this error.
   
   
2. Download and install Enterprise Ruby
   ( http://www.rubyenterpriseedition.com/download.html )
   
   

   mkdir -p ~/Temp/Sources
   cd ~/Temp/Sources
   wget http://rubyforge.org/frs/download.php/68719/ruby-enterprise-1.8.7-2010.01.tar.gz
   tar xzvf ruby-enterprise-1.8.7-2010.01.tar.gz
   ./ruby-enterprise-1.8.7-2010.01/installer
   

   
   At the end we should have a working Ruby installation.
   Let's create some useful link.
   
   

   ln -s /opt/ruby-enterprise-1.8.7-2010.01/bin/rake /usr/bin/rake
   ln -s /opt/ruby-enterprise-1.8.7-2010.01/bin/gem /usr/bin/gem
   ln -s /opt/ruby-enterprise-1.8.7-2010.01/bin/rails /usr/bin/rails
   ln -s /opt/ruby-enterprise-1.8.7-2010.01/bin/ruby /usr/bin/ruby
   ln -s /opt/ruby-enterprise-1.8.7-2010.01/bin/irb /usr/bin/irb
   

   
   Congratulations! You have now ruby on rails on your CentOS!
   
   Try the following to confirm:
   
   

   ruby -v
   ruby 1.8.7 (2009-12-24 patchlevel 248) [i686-linux], MBARI 0x8770, Ruby Enterprise Edition 2010.01
   rails -v
   Rails 2.3.8
   gem -v
   1.3.5