Use Phusion Passenger and Ruby Enterprise Edition for Ruby on Rails

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Plesk comes with a way to run Ruby on Rails applications via FastCGI, but it's quite a bit of manual work to setup Ruby on Rails applications and there are currently better, faster and easier ways to run Ruby on Rails applications:

Phusion Passenger: http://www.modrails.com/
Ruby Enterprise Edition: http://www.rubyenterpriseedition.com/ (optional, 33% less memory usage on average)