Which EC2 instance will be the first one to be terminated by your Auto Scaling group?

A suite of web applications is hosted in an Auto Scaling group of EC2 instances across three Availability Zones and is configured with default settings. There is an Application Load Balancer that forwards the request to the respective target group on the URL path. The scale-in policy has been triggered due to the low number of incoming traffic to the application.

Which EC2 instance will be the first one to be terminated by your Auto Scaling group?
A . The instance will be randomly selected by the Auto Scaling group
B . The EC2 instance launched from the oldest launch configuration
C . The EC2 instance which has been running for the longest time
D . The EC2 instance which has the least number of user sessions

View Answer

Answer: B

Explanation:

The default termination policy is designed to help ensure that your network architecture spans Availability Zones evenly. With the default termination policy, the behavior of the Auto Scaling group is as follows: