Chapter 11. Achieving high availability: availability zones, auto-scaling, and CloudWatch

This chapter covers

  • Using a CloudWatch alarm to recover a failed virtual server
  • Understanding availability zones in an AWS region
  • Using auto-scaling to guarantee running virtual servers
  • Analyzing disaster-recovery requirements

In this chapter, we’ll teach you how to build a high-availability architecture based on EC2 instances. A virtual server isn’t highly available by default. The following scenarios cause an outage of your virtual server:

  • The virtual server fails because of a software issue (the OS of the virtual server).
  • A software issue occurs on the host server, causing the virtual server to crash (the OS of the host server or virtualization ...

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