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Learning AWS - Second Edition by Amit Shah, Aurobindo Sarkar

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Region availability or regional redundancy

Elastic Load Balancing and Amazon Route 53 have been integrated to support a single application across multiple regions. Route 53 is AWS’s highly available scalable DNS and health checking service. Route 53 supports high availability architectures by health checking load balancer nodes and re-routing traffic to avoid the failed nodes as they support implementation of multi-region deployments. In addition, Route 53 uses Latency Based Routing to route your customers to the end-point that has the least latency. If multiple primary sites are implemented with appropriate health checks configured then failures result in traffic being shifted away from that site to an alternate region.

Region failures can ...

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