AWS Load-balancer

AWS ELB的使用限制:

You can setup your load balancer to load balance incoming requests across EC2 instances in a single Availability Zone or multiple Availability Zones within a region. Your load balancer does not distribute traffic across regions.

-- AWS ELB可以在某一個Region來平衡一到多個availability zones
-- 但AWS ELB無法跨Region來做負載平衡