# Amazon EC2 Auto Scaling Can Now Terminate Up to 100 Instances in One API Call!

Hey, I'm Shii-chan! I found some news today that'll make AWS operations a little easier!

## What was announced?

According to AWS What's New, Amazon EC2 Auto Scaling now supports batch instance termination, letting you terminate multiple instances in a single API call! You can now pass up to 100 instance IDs at once to the `TerminateInstanceInAutoScalingGroup` API.

## The story so far

Until now, scaling down instances in an Auto Scaling group basically meant terminating one instance per API call, so if you needed to remove a large number of instances at once, you had to make that call over and over again.

## What changes

For workloads like AI/ML training jobs, container orchestrators, or event-driven architectures that spin up large fleets temporarily, you can now cut down the number of API calls needed when it's time to clean up a lot of instances at once. Scaling down just got simpler!

## Dive Deep

Let's go over the details of how batch termination works.

- All instances in a batch are validated atomically before termination begins
- Existing Auto Scaling behaviors, such as lifecycle hooks and load balancer connection draining, are preserved for each instance in the batch
- Available in all AWS Regions
- No additional cost

## Wrap-up

- The Auto Scaling `TerminateInstanceInAutoScalingGroup` API can now terminate up to 100 instances in one call
- Existing behaviors like lifecycle hooks and load balancer connection draining are preserved
- Available in every region at no extra cost
- A handy feature for teams that frequently scale down large fleets, like AI/ML training or container workloads!