By Nayu Kim - http://www.flickr.com/photos/nayukim/5704132134/, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=15797492
Running HAProxy behind Amazon's ELB
You can run HAProxy behind Amazon’s ELB for increased control over traffic to your web servers. The following tweaks will help with stable, sustainable performance in such a setup.