You are a DevOps engineer working in a small IT company. It has a limited operation budget for AWS resources. So spot EC2 instances are always suggested. There is a new application that will be deployed via a Load Balancer and Auto Scaling Group. However, as this application controls the authentication for all other company products, it is inappropriate to use only spot instances for this. The best way is to use a combination of On-Demand and Spot instances for the Auto Scaling Group if possible. What is the best way to implement this?

Answer options:

A.Create two ASGs. One for On-Demand instances and one for Spot instances.
B.Create the ASG by a Launch Template and configure the On-Demand/Spot percentage accordingly.
C.In Auto Scaling Launch Configuration, configure a suitable On-Demand/Spot percentage and then create the ASG with this Launch Configuration.
D.It is impossible to create a combination of On-Demand and Spot instances for this case. Only one type is allowed for an ASG configuration.

Correct Answer – B
There are two methods to configure an Auto Scaling Group - a Launch Configuration or a Launch Template. Please refer to https://docs.aws.amazon.com/autoscaling/ec2/userguide/create-asg-launch-template.html and https://docs.aws.amazon.com/autoscaling/ec2/userguide/create-asg.html for details:
Option A is incorrect: Although this can potentially work, it is not the best approach compared to option
B. It also needs to maintain two ASGs.
Option B is CORRECT: To create an ASG by a Launch Template, users can have the flexibility to launch a combination of instance types and On-Demand and Spot purchase options.
Option C is incorrect: Because Launch Configuration does not support the combinations of On-Demand and Spot purchase options.
Option D is incorrect: Refer to Option
B.