Question

A SysOps administrator manages a stateless web application behind an Application Load Balancer. Leadership wants to reduce compute costs by up to 70% while maintaining high availability across three Availability Zones. The application can tolerate individual instance interruptions but must always keep at least 40 instances running to serve baseline traffic. The current Auto Scaling group uses a single On-Demand instance type. Which configuration change BEST meets these requirements?

Accepted Answer

Configure an Auto Scaling group mixed instances policy with multiple instance types across all three AZs, using capacity-optimized allocation for Spot, and set On-Demand base capacity to 40 instances with additional capacity split as Spot.

Answer

Change the launch template to request 100% Spot Instances of a single instance type and set the minimum capacity to 40 to guarantee baseline availability.

Answer

Create a separate Auto Scaling group using only Spot Instances and manually add 40 Reserved Instances outside of Auto Scaling for the baseline.

Answer

Keep On-Demand instances but enable predictive scaling and target tracking to lower the average number of running instances during off-peak hours.