In this chapter, we introduced the ECS auto scaling service, as used with the Fargate launch type. Configuring auto scaling involves setting a range (minimum and maximum) for the number of tasks within which the auto scaling gets applied. Configuring auto scaling also requires an auto scaling policy, consisting of a CloudWatch alarm threshold for running the auto scaling policy, and one or more scaling actions to perform each time the auto scaling policy runs. In the next chapter, we shall discuss using an IAM user with Fargate.