As the comments on the original post dont seem to work (wp-comments.php returns a empty page) – will try replying via a blog post and see if the trackback is picked up.
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Re 1. Isn’t that what “Elastic IP“s do? – “Virtual IP”s that you can map to which ever instance you like.
We were upgrading WordPress around the time that post went live – I can assure you it does at least work now.
Elastic IPs are not Virtual IPs (oh how I wish they were!). They take the place of the original IP address, so it’s not easy to do something like:
db1 (w/private address)
db2 (w/private address)
floating IP (could be either db1 or db2).
The problem is that you need those private addresses to run services between the two nodes in the cluster. Sure, you could probably hack up a new haresource to do Elastic IP moving, but replication would also break everytime you run it.