Chapter 9: High Availability and Elasticity on AWS
Most applications follow a design pattern that comprises several layers—such as the network layer, the compute layer, and the storage and database layers. We call this a multi-tier application. So, for example, you can have a three-tier application stack comprising a web services layer that offers frontend web interface access, an application layer where perhaps all data processing happens, and a backend database layer to store and manage data.
In this chapter, we start to bring together the various core Amazon Web Services (AWS) services we have learned about so far to design and architect a complete end-to-end (E2E) solution. Furthermore, in previous chapters, we have only deployed single resource instances of various AWS services—for example, a single Elastic Compute Cloud (EC2) instance to offer compute capability, or as in the previous chapter, where we deployed a single Amazon Relational Database Service (RDS...
