AUTO SCALING

1. Auto Scaling helps you ensure that you have the correct number of Amazon EC2 instances available to handle the load for your application.

2. Collection of ec2 instance is called auto scaling groups. We can specify the minimum and maximum number of instances in each Auto Scaling group, and Auto Scaling ensures that your group never goes below or above this size.

3. When you create an Auto Scaling group, you must specify a launch configuration. Max 20 auto scaling groups per region.