I watched your Installing Ruby video to see how you did it, I strongly disagree with using rbenv in production. It adds on a completely unnecessary layer of complexity to the system and adds maintenance steps that are likely to be forgotten by the next fellow.

I recommend using Ubuntu server and using the BrightBox PPA to install 2.1. Updates are an apt-get away, and adding PPAs is far easier to do with configuration management than managing rbenv or rvm.

I use rbenv in development and it's a godsend. I keep it the hell away from production, though.