In this chapter, we reviewed some of the strategies you can follow in order to achieve high availability in your cloud application. We emphasized the importance both designing your application architecture for availability and using AWS infrastructural services to get the best results. We followed this up with a section on setting up high availability in our sample application. 

In the next chapter, we will shift our focus to strategies to design and implement security for your cloud application. We will review some approaches for application security using AWS services. We will also include a hands-on section that will walk you through the process of implementing security in our sample application.