Question

A SysOps administrator manages a stateful web application on EC2 instances in an Auto Scaling group behind an Application Load Balancer. Each instance maintains long-running upload sessions. During scale-in events, users report that in-progress uploads are abruptly terminated before completing. The administrator needs to ensure that instances complete active sessions before being terminated. Which approach BEST solves this problem?

Accepted Answer

Add an EC2 instance-terminating lifecycle hook to the Auto Scaling group that pauses termination and use a script to signal CONTINUE once active sessions drain.

Answer

Increase the health check grace period on the Auto Scaling group so instances have more time before termination.

Answer

Configure a target tracking scaling policy with a longer scale-in cooldown period to delay terminations.

Answer

Enable cross-zone load balancing on the Application Load Balancer to distribute connections more evenly.