Designing multi-Region HA solutions
In Chapter 6, AWS Networking Services – VPCs, Route53, and CloudFront, we looked at Amazon Route 53, which offers DNS and traffic routing policies to help design highly available and resilient architectures incorporating configurations that increase performance and security best practices. We also looked at how Amazon CloudFront can help cache content locally closer to end users, which reduces latency and improves overall performance.
While Amazon Auto Scaling and ELB services help you offer HA and scalable services within a given Region on their own, there is no provision for global availability of services. If you were to host your application in a single Region alone and if that Region were to fail, your end users would not be able to access your applications until the Region came back online and resources made available.
Services such as Route 53 and CloudFront, however, enable you to extend your application's availability...
