AWS Certified SysOps Administrator – Associate — Question 253

A company runs an application on Amazon EC2 instances that are in an Amazon EC2 Auto Scaling group. Scale-out actions take a long time to become complete because of long-running boot scripts. A SysOps administrator must implement a solution to reduce the required time for scale-out actions without overprovisioning the Auto Scaling group.

Which solution will meet these requirements?

Answer options

• A. Change the launch configuration to use a larger instance size.
• B. Increase the minimum number of instances in the Auto Scaling group.
• C. Add a predictive scaling policy to the Auto Scaling group.
• D. Add a warm pool to the Auto Scaling group.

Correct answer: D

Explanation

The correct answer is D because adding a warm pool allows pre-initialized instances to be quickly utilized during scale-out actions, significantly reducing the time needed for booting. Option A would increase instance size but does not directly address the boot time issue, option B would increase capacity but still face the same boot time delays, and option C involves predictive scaling which may not solve the immediate scale-out time problem.