Running your Amazon EC2 instances in Auto Scaling groups allows you to improve your application's availability right out of the box. Auto Scaling replaces impaired or unhealthy instances automatically to maintain your desired number of instances (even if that number is one). You can also use Auto Scaling to automate the provisioning of new instances and software configurations as well as to track of usage and costs by app, project, or cost center. Of course, you can also use Auto Scaling to adjust capacity as needed - on demand, on a schedule, or dynamically based on demand. In this session, we show you a few of the tools you can use to enable Auto Scaling for the applications you run on Amazon EC2. We also share tips and tricks we've picked up from customers such as Netflix, Adobe, Nokia, and Amazon.com about managing capacity, balancing performance against cost, and optimizing availability.