O'Reilly logo

Learning AWS - Second Edition by Amit Shah, Aurobindo Sarkar

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Using Amazon CloudWatch for Auto Scaling

Amazon CloudWatch is a web service that enables you to monitor and manage various metrics, and configure alarm actions based on the metrics. A metric is a variable that you want to monitor, for example, CPU usage or incoming network traffic. A CloudWatch alarm is an object that monitors a single metric over a specific period. The alarm changes its state when the value of the metric breaches a defined range and maintains the change for a specified number of periods.

Amazon CloudWatch can aggregate metrics across pre-defined dimensions, for example, aggregating the CPU utilization of all EC2 instances in an Auto Scaling group. The alarm connected to an Auto Scaling policy triggers a scaling event, and ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required