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Exam AWS Certified Solutions Architect - Professional topic 1 question 680 discussion

Exam question from Amazon's AWS Certified Solutions Architect - Professional

Question #: 680
Topic #: 1

[All AWS Certified Solutions Architect - Professional Questions]

A company wants to run a serverless application on AWS. The company plans to provision its application in Docker containers running in an Amazon ECS cluster.
The application requires a MySQL database and the company plans to use Amazon RDS. The company has documents that need to be accessed frequently for the first 3 months, and rarely after that. The document must be retained for 7 years.
What is the MOST cost-effective solution to meet these requirements?

A. Create an ECS cluster using On-Demand Instances. Provision the database and its read replicas in Amazon RDS using Spot Instances. Store the documents in an encrypted EBS volume, and create a cron job to delete the documents after 7 years.
B. Create an ECS cluster using a fleet of Spot Instances, with Spot Instance draining enabled. Provision the database and its read replicas in Amazon RDS using Reserved Instances. Store the documents in a secured Amazon S3 bucket with a lifecycle policy to move the documents that are older than 3 months to Amazon S3 Glacier, then delete the documents from Amazon S3 Glacier that are more than 7 years old.
C. Create an ECS cluster using On-Demand Instances. Provision the database and its read replicas in Amazon RDS using On-Demand Instances. Store the documents in Amazon EFS. Create a cron job to move the documents that are older than 3 months to Amazon S3 Glacier. Create an AWS Lambda function to delete the documents in S3 Glacier that are older than 7 years.
D. Create an ECS cluster using a fleet of Spot Instances with Spot Instance draining enabled. Provision the database and its read replicas in Amazon RDS using On-Demand Instances. Store the documents in a secured Amazon S3 bucket with a lifecycle policy to move the documents that are older than 3 months to Amazon S3 Glacier, then delete the documents in Amazon S3 Glacier after 7 years.

Show Suggested Answer

Suggested Answer: B 🗳️

by liono at Nov. 8, 2020, 10:28 a.m.

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liono

Highly Voted 3 years, 8 months ago

B seems to be correct, spot instances for ECS cluster and Reserved instances for RDB

upvoted 16 times

kirrim

3 years, 7 months ago

Agree, more info: A with RDS on spot instances is automatically ruled out B is feasible by using a "Diversified" allocation strategy when setting up the Spot provisioning ECS cluster C is feasible but more expensive to do RDS on-demand instances than RDS RI as in B, and uses EFS instead of S3 to store the documents, not as cost effective D is feasible but more expensive to do RDS on-demand instances than RDS RI as in B https://aws.amazon.com/ec2/spot/containers-for-less/get-started/ https://aws.amazon.com/ec2/spot/instance-advisor/

upvoted 2 times

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Ebi

Highly Voted 3 years, 7 months ago

B for sure

upvoted 6 times

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Amsa

Most Recent 2 years, 7 months ago

Selected Answer: B

B is correct, straight from Don Bonso's test

upvoted 1 times

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KiraguJohn

2 years, 10 months ago

I was skeptical of spot instance on ECS until i read this; Amazon Elastic Container Service (ECS) supports Automated Spot Instance Draining, a new capability that reduces service interruptions due to Spot termination for ECS workloads. This feature will enable ECS customers to safely manage any interruptions of ECS tasks running on Spot instances due to termination of the underlying EC2 Spot instance.

upvoted 4 times

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frankzeng

3 years, 4 months ago

https://aws.amazon.com/about-aws/whats-new/2019/09/amazon-ecs-supports-automated-draining-for-spot-instances-running-ecs-services/

upvoted 3 times

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cldy

3 years, 5 months ago

B is correct.

upvoted 1 times

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Ni_yot

3 years, 5 months ago

B for me. you want to use reserved instances as its cost effective.

upvoted 2 times

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vramchn

3 years, 6 months ago

B for sure

upvoted 1 times

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AzureDP900

3 years, 6 months ago

B Is right

upvoted 1 times

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andylogan

3 years, 7 months ago

It's B

upvoted 1 times

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tgv

3 years, 7 months ago

BBB ---

upvoted 1 times

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Suresh108

3 years, 7 months ago

method of elimination - choosing B as answer. A and C are eliminated - due to cron usage D - eliminated due to on-demand instance where DB cost can be reduced by reserved instances (seems it needs to be run for several years).

upvoted 2 times

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