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I was setting up a load-balanced pair of Nodes on EC2 and ran into a snag: you can’t add paid AMIs (we sometimes use the real RedHat AMIs) with the elastic load balancers!
So I kicked off some Centos 5.2 images from RightScale and moved everything over. This is going to cost RedHat, since now I’ve used the Centos images and they half the cost and just as nice. I doubt I’ll be going back to using the expensive RHEL AMIs.