Step-by-Step Explanation:
Understand the Problem:
The company has a stateless application on 10 EC2 On-Demand Instances in an Auto Scaling group.
At least 6 instances are needed to meet service requirements.
The goal is to maintain uptime cost-effectively.
Analyze the Requirements:
Maintain a minimum of 6 instances to meet service requirements.
Optimize costs by using a mix of instance types.
Evaluate the Options:
Option A: Use a Spot Fleet with an On-Demand capacity of 6 instances.
Spot Fleets allow you to request a combination of On-Demand and Spot Instances.
Ensuring a minimum of 6 On-Demand Instances guarantees the required capacity while leveraging lower-cost Spot Instances to meet additional demand.
Option B: Update the Auto Scaling group with a minimum of 6 On-Demand Instances and a maximum of 10 On-Demand Instances.
This option ensures the minimum required capacity but does not optimize costs since it only uses On-Demand Instances.
Option C: Update the Auto Scaling group with a minimum of 1 On-Demand Instance and a maximum of 6 On-Demand Instances.
This does not meet the requirement of maintaining at least 6 instances at all times.
Option D: Use a Spot Fleet with a target capacity of 6 instances.
This option relies entirely on Spot Instances, which may not always be available, risking insufficient capacity.
Select the Best Solution:
Option A: Using a Spot Fleet with an On-Demand capacity of 6 instances ensures the necessary uptime with a cost-effective mix of On-Demand and Spot Instances.
Amazon EC2 Auto Scaling
Amazon EC2 Spot Instances
Spot Fleet Documentation
Using a Spot Fleet with a combination of On-Demand and Spot Instances offers a cost-effective solution while ensuring the required minimum capacity for the application.
