Exam AWS Certified DevOps Engineer - Professional DOP-C02 All Questions

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Exam AWS Certified DevOps Engineer - Professional DOP-C02 topic 1 question 115 discussion

Exam question from Amazon's AWS Certified DevOps Engineer - Professional DOP-C02

Question #: 115
Topic #: 1

[All AWS Certified DevOps Engineer - Professional DOP-C02 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 volume 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

Suggested Answer: D 🗳️

by Jeanphi72 at May 9, 2023, noon

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ParagSanyashiv

Highly Voted 2 years, 3 months ago

Selected Answer: D

D is more suitable, as it says to avoid 30min launch time.

upvoted 7 times

Mail1964

2 years, 3 months ago

I assume you are saying D over C as D will make the EC2 instances operational quicker, while C would require 30 minutes to install the software before it can start to be used. resulting in it being more cost effective.

upvoted 3 times

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jamesf

Most Recent 1 year ago

Selected Answer: D

keywords: MOST cost-effective, a generic EC2 Linux image takes 30 minutes. Mean take 30mins or longer time for EC2 booting and will cost more.

upvoted 2 times

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WhyIronMan

1 year, 4 months ago

Selected Answer: D

D is the correct answer. Make the calculations 30 min of bootstraping when you have multiple scale actions is a lot of time idle when you have many instances, so the money spent during a lot of spot request that wast time boostraping is larger than keeping a single AMI. Details are everything during an investigation...

upvoted 3 times

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Diego1414

1 year, 6 months ago

Selected Answer: C

Answer is C. C is cheaper than D

upvoted 2 times

HayLLlHuK

1 year, 4 months ago

"utilize user data to configure the EC2 Linux instance on startup" - it takes an addiction time to configure an instance. it's better to use a custom AMI and have everything preinstalled

upvoted 3 times

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thanhnv142

1 year, 6 months ago

C is correct: <can tolerate interruptions> means EC2 spot instances. A and B: no mention of spot instances D: Create a custom AMI for the cluster and use the latest AMI when creating instances: this incurs more cost than option C, which incurs no cost for the configuration step

upvoted 3 times

GripZA

4 months ago

The 30min bootstrapping will incur runtime costs, which can be avoided by using the latest AMI already containing the files, installtions etc done by the bootstrapping.

upvoted 1 times

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vmahilevskyi

1 year, 5 months ago

As for me, extra 30 minutes for each EC2 launch seems like an extra cost comparing to one-time built AMI. So D looks cheaper than C

upvoted 3 times

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zain1258

1 year, 9 months ago

Selected Answer: D

It's D

upvoted 2 times

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Cloud_noob

1 year, 10 months ago

Selected Answer: D

D most suitable. why would you be willing to wait for 30 minutes for software installation?

upvoted 2 times

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FEEREWMWKA

1 year, 11 months ago

D - Spot Instances are cheaper than Ec2 and the workload can tolerate interruptions. Also Custom AMI removes the need for 30 mins configuration which takes a resource that will need to be paid

upvoted 4 times

thanhnv142

1 year, 6 months ago

I think you may be wrong. D - creating custom AMI costs you a lot. You would need to buy services from EC2 image builder to rebuild and pay for the one who rebuild the custom AMI. Meanwhile, configuring manually (option C) costs you nothing but time. Of course, in corporate environment, time is money, but you would cost way less than option D - which suggests cost from creating and maintaining the AMI image (latest AMI image)

upvoted 2 times

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ogwu2000

2 years, 1 month ago

C is the answer. Because it specifically mentioned EC2 Linux instance as requested in the question. D only mentioned creating an AMI but is it Linux AMI?

upvoted 3 times