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Exam AWS DevOps Engineer Professional topic 1 question 118 discussion

Exam question from Amazon's AWS DevOps Engineer Professional
Question #: 118
Topic #: 1
[All AWS DevOps Engineer Professional Questions]

A DevOps engineer is researching the least expensive way to implement an image batch processing cluster on AWS. The application cannot run in Docker containers and must run on Amazon EC2. The batch job stores checkpoint data on an NFS and can tolerate interruptions. Configuring the cluster software from a generic EC2 Linux image takes 30 minutes.

What is the MOST cost-effective solution?

  • A. Use Amazon EFS for checkpoint data. To complete the job, use an EC2 Auto Scaling group and an On-Demand pricing model to provision EC2 instances temporarily.
  • B. Use GlusterFS on EC2 instances for checkpoint data. To run the batch job, configure EC2 instances manually. When the job completes, shut down the instances manually.
  • C. Use Amazon EFS for checkpoint data. Use EC2 Fleet to launch EC2 Spot Instances, and utilize user data to configure the EC2 Linux instance on startup.
  • D. Use Amazon EFS for checkpoint data. Use EC2 Fleet to launch EC2 Spot Instances. Create a custom AMI for the cluster and use the latest AMI when creating instances.
Show Suggested Answer Hide Answer
Suggested Answer: D 🗳️
by Imstack at Dec. 23, 2022, 2:15 p.m.
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4b18f59
8 months, 2 weeks ago
D. While this could work, creating and maintaining custom AMIs adds unnecessary complexity and potential costs when user data can achieve the same result more efficiently. The chosen solution (C) provides the best balance of cost-effectiveness, scalability, and ease of management: It uses the cheapest compute option (Spot Instances) that meets the requirements. It leverages a fully managed, scalable file system (EFS) for checkpoint data. It automates instance configuration using user data, reducing management overhead. It can easily scale up or down based on demand using EC2 Fleet.
upvoted 1 times
4b18f59
8 months, 2 weeks ago
My bad it has to be D for the 30 min load up time
upvoted 1 times
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easytoo
2 years, 2 months ago
C is cheaper than D
upvoted 1 times
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Piccaso
2 years, 4 months ago
Selected Answer: D
A is almost un-doable. B is using GlusterFS. AWS-native products are better. Between C and D. D is better because customised AMI brings convenience.
upvoted 2 times
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Bulti
2 years, 4 months ago
Selected Answer: D
D is correct.
upvoted 1 times
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strike3test
2 years, 5 months ago
D sounds reasonable
upvoted 1 times
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Kapello10
2 years, 5 months ago
D is the correct ans
upvoted 2 times
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Imstack
2 years, 5 months ago
D - correct
upvoted 1 times
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A (35%)
C (25%)
B (20%)
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