Marcus, the limitation exists only on the VPC Virtual Router side. All LB rules are stored in the single haProxy config, and haproxy restarts on any of the single rule change. If we support public LB on multiple tiers, the changes to the tier1 rule would affect rules of the tier2 as well (rules will become unavailable for some time while ha proxy restart is happening).
Anthony Xu wrote the backend for the feature, he might share more details on the topic. Anthony? There is also a Jira ticket - implement LB on multiple tiers inside the VPC by providing graceful HA proxy restart. Its targeted post 4.2 -Alena. On 5/2/13 9:30 PM, "Marcus Sorensen" <[email protected]> wrote: >Maybe this has been asked before... Is there a technical reason why VPC >can >only support one loadbalanced tier? What kind of issues would one run >into >if you simply let the network offering be used multiple times in a VPC? >
