Auto Scaling is a web service designed to launch or terminate Amazon EC2 instances automatically based on user-defined policies, schedules, and health checks.
Getting Started Guide
Introduces you to Auto Scaling, helps you set up an account, and walks you through a simple example to use Auto Scaling for the first time. Also provides tips and links to advanced features and resources. PDF
Describes all the API operations for Auto Scaling in detail. Also provides sample requests, responses, and errors for the supported web services protocols.
HTML | PDF
Provides a conceptual overview of Auto Scaling and includes detailed development instructions for using the various features. HTML | PDF | Kindle