I need to use Elastic Load Balancer (ELB) to load balance app server instances across two availability zones. That seems to work correctly, but I don't know how to limit the app server instances to only two zones. When I select "launch in separate availability zones" Scalr launches instances in all four zones instead of just the two that the ELB is configured for. I only need two zones, so I don't want to enable all four. I could create two app server roles that launch in two zones, but the "website" only allows for one role to receive requests.
The reason for doing this is that we want redundancy between two availability zones, so I need to mirror the instances in both zones. What's the right way to do this?
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