I was looking at RightScale's architecture diagrams and came across their Basic 4-Server Setup (with EBS): http://support.rightscale.com/12-Guides/EC2_Best_Practices/EC2_Site_Architecture_Diagrams#Basic_4-Server_Setup_with_EBS
I'm assuming that in front the top 2 IP's are meant to be EC2 static IPs (where you publish multiple IPs for your domain).
The two things I didn't really understand are
- Why isn't it using Amazon's Elastic Load Balancing (ELB)?
- Why isn't it using Amazon's Relational Database System (RDS)?
Is this just so that things are more portable to another cloud offereing?