Auto-Scaling Quiz
While reviewing the Auto Scaling events for your application, you notice that your application is scaling up and down multiple times in the same hour.
What design choice could you make to optimize costs while preserving elasticity?
Choose 2 answers from the options given below.
A. Modify the Auto Scaling group termination policy to terminate the older instance first.
B. Modify the Auto Scaling group termination policy to terminate the newest instance first.
C. Modify the Auto Scaling group cool down timers.
D. Modify the CloudWatch alarm period that triggers your Auto Scaling scale down policy
C. & D
Here, not enough time is being given for the scaling activity to take effect and for the entire infrastructure to stabilize after the scaling activity. This can be taken care of by increasing the Auto Scaling group CoolDown timers.
For more information on Auto Scaling CoolDown, please visit the following URL:
https://docs.aws.amazon.com/autoscaling/ec2/userguide/Cooldown.html
You will also have to define the right threshold for the CloudWatch alarm for triggering the scale down policy.
For more information on Auto Scaling Dynamic Scaling, please visit the following URL:
https://docs.aws.amazon.com/autoscaling/ec2/userguide/as-scale-based-on-demand.html
