Читать книгу AWS Certified Solutions Architect Study Guide - Ben Piper, David Higby Clinton - Страница 78

The EC2 Auto Scaling service offers a way to both avoid application failure and recover from it when it happens. Auto Scaling works by provisioning and starting on your behalf a specified number of EC2 instances. It can dynamically add more instances to keep up with increased demand. And when an instance fails or gets terminated, Auto Scaling will automatically replace it.

EC2 Auto Scaling uses either a launch configuration or a launch template to automatically configure the instances that it launches. Both perform the same basic function of defining the basic configuration parameters of the instance as well as what scripts (if any) run on it at launch time. Launch configurations have been around longer and are more familiar to you if you've been using AWS for a while. You're also more likely to encounter them if you're going into an existing AWS environment. Launch templates are newer and are what AWS now recommends. You'll learn about both, but which you use is up to you.