13 Achieving high availability: Availability zones, autoscaling, and CloudWatch
This chapter covers
- Recovering a failed virtual machine with a CloudWatch alarm
- Using autoscaling to guarantee your virtual machines keep running
- Understanding availability zones in an AWS region
- Analyzing disaster-recovery requirements
Imagine you run an online shop. During the night, the hardware running your virtual machine fails. Your users can no longer access your web shop until the next morning when you go into work. During the eight-hour downtime, your users search for an alternative and stop buying from you. That’s a disaster for any business. Now imagine a highly available web shop. Just a few minutes after the hardware failed, the system recovers, restarts ...
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