Thanks for that link, it was very helpful. It got me wondering if one could run most of your PAAS stack on dedicated hardware at a colo, and the Mongrel2 frontend(s) would sit in a small EC2 instance(s). Could give me your opinion on such a setup?
You can definitely do that as you will get inter node communication over the EC2 private IP. You can define your EC2 firewall to also segment your production/staging/testing setup. This would be very elegant.
