multiple rails applications on same host name with different folders

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http://askubuntu.com – When i ssh to amazon ec2, then pwd /home/ubuntu ls app_1 app_2 app_3 app_4 Considering i have mapped my ec2-122** address to some apps.site1.com How can i have multiple rails applications running like if i access, apps.site1.com/app_1 apps.site1.com/app_2 apps.site1.com/app_3 each of the application should be loaded. One of my friends told he has implemented it for apache+php application, where various index.php files are present and each folder structure is independently available as separate running application. How can i implement this for rails applications, (HowTos)