1. Install ruby
# > yum install ruby ruby-devel ruby-libs ruby-irb ruby-rdoc
2. Install gem
# > wget http://rubyforge.org/frs/download.php/45905/rubygems-1.3.1.gz
# > tar xvf rubygems-1.3.1.gz
# > cd rubygems-1.3.1
# > ruby setup.rb
3. Install Rails
# > gem install rails