Ich habe gerade ein paar Infos zu Plesk und Ruby on Rails gefunden. Allerdings kann ich noch nicht bestätigen, ob die beschriebene Anleitungauf funktioniert …

Go to your domain that you want to adjust, and click Setup. Make sure the CGI and FastCGI options are enabled. Pick a name for your application and make the directory for your application in the httpdocs directory. Upload your files to that directory.

Once you’ve done that, create an .htaccess file in the httpdocs directory with the following text inside:

RewriteEngine On
RewriteRule ^$ /public/index.html [L]
RewriteCond % !^/railsapp/public
RewriteRule ^(.*)$ /public/$1 [L]
RewriteCond % !-f
RewriteRule ^(.*)$ public/dispatch.fcgi/$1 [QSA,L]

Remove the .htaccess file within the public directory of your application and add a file called dispatch.fcgi to that directory which contains:

#!/usr/bin/ruby

You should be able to access your application at http://domain.com/railsapp/

Thx Major Hayden 4 the information :)