Try the Ruby Versio Manager:

http://rvm.beginrescueend.com

On 11/29/2010 06:03 AM, Heinz Strunk wrote:
> Hey guys,
>
> I'm wondering if it's possible to run multiple Ruby versions at the same
> time in production mode. I got some older Rails apps that need to run in
> Ruby 1.8.7 and some newer ones requiring 1.9.1.
>
> How can I run both versions at the same time?
>
> Thanks in advance!
>