Ruby via FastCGI and NGiNX?

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http://serverfault.com – I have NGiNX setup, and would like to be able to run sites I create in Ruby. However my server is pretty fail, only like 250mb memory, probably less, so instead of having to run each Ruby site with the Thin server I want to run the Ruby sites only when they are accessed, like the way PHP works with the PHP-FPM server. How does one go about this with NGiNX and Ruby? (HowTos)