Auto-Scaling Quiz
An application hosted on EC2 Instances has its promotional campaign due to start in 2 weeks. There is a mandate from the management to ensure that no performance problems are encountered due to traffic growth during this time. Which of the following must be done to the Auto Scaling Group to ensure this requirement can be fulfilled?
A. Configure Step scaling for the Auto Scaling Group.
B. Configure Dynamic Scaling and use Target tracking scaling Policy
C. Configure Scheduled scaling for the Auto Scaling Group
D. Configure Static scaling for the Auto Scaling Group
B. Configure Dynamic Scaling and use Target tracking scaling Policy
If you are scaling is based on a metric, which is an utilization metric that increases or decreases proportionally to the number of instances in the Auto Scaling group, we recommend that you use a target tracking scaling policy instead.
In Target tracking scaling policies you select a predefined metric or configure a customized metric, and set a target value. EC2 Auto Scaling creates and manages the CloudWatch alarms that trigger the scaling policy and calculates the scaling adjustment based on the metric and the target value. The scaling policy adds or removes capacity as required to keep the metric at, or close to, the specified target value.
Scheduled scaling works better when you can predict the load changes and also when you know how long you need to run. Here in our scenario we just know that there will be a heavy traffic during the campaign period (period is not specified) but not sure about the actual traffic. Don’t have any history to predict it either.
For more information on Auto Scaling Scheduled Scaling, please visit the following URL:
https://docs.aws.amazon.com/autoscaling/ec2/userguide/schedule_time.html
https://docs.aws.amazon.com/autoscaling/ec2/userguide/as-scaling-simple-step.html
https://docs.aws.amazon.com/autoscaling/ec2/userguide/as-scaling-target-tracking.html
