Since ISPConfig 2.2.20, there is support for Ruby. I have seen that there is also a howto available here, which explains how to setup Ruby on Rails at http://www.howtoforge.com/ruby_on_rails_debian_etch. That howto has been published before the release of ISPConfig 2.2.20. Now my question: is it necesarry to take all the steps as described within the Ruby on Rails howto to make the hosting of RoR possible or does ISPConfig 2.2.20 contain some properties, which means that it is not possible anymore?
I think you have to replace chapter two with this tutorial: http://www.howtoforge.com/apache2-mod_ruby-with-ispconfig-2.2.20-and-above