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Exam AWS Certified Developer Associate topic 1 question 227 discussion

Exam question from Amazon's AWS Certified Developer Associate

Question #: 227
Topic #: 1

[All AWS Certified Developer Associate Questions]

A company has a multi-node Windows legacy application that runs on premises. The application uses a network shared folder as a centralized configuration repository to store configuration files in .xml format. The company is migrating the application to Amazon EC2 instances. As part of the migration to AWS, a developer must identify a solution that provides high availability for the repository.

Which solution will meet this requirement MOST cost-effectively?

A. Mount an Amazon Elastic Block Store (Amazon EBS) volume onto one of the EC2 instances. Deploy a file system on the EBS volume. Use the host operating system to share a folder. Update the application code to read and write configuration files from the shared folder.
B. Deploy a micro EC2 instance with an instance store volume. Use the host operating system to share a folder. Update the application code to read and write configuration files from the shared folder.
C. Create an Amazon S3 bucket to host the repository. Migrate the existing .xml files to the S3 bucket. Update the application code to use the AWS SDK to read and write configuration files from Amazon S3.
D. Create an Amazon S3 bucket to host the repository. Migrate the existing xml files to the S3 bucket. Mount the S3 bucket to the EC2 instances as a local volume. Update the application code to read and write configuration files from the disk.

Show Suggested Answer

Suggested Answer: C 🗳️

by k1kavi1 at Nov. 25, 2022, 2:22 p.m.

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Comments

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xicomynor

Highly Voted 2 years, 7 months ago

Selected Answer: C

I go with C. Even though S3 can be mounted, it might be less cost effective depending on the API operations that the tool you use to mount the bucket will perform. But with C, if you only perform controlled GET and PUT API calls as this questions states then API option will be more cost effective.

upvoted 5 times

xicomynor

2 years, 7 months ago

*SDK option will be more cost effective

upvoted 1 times

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captainpike

Most Recent 2 years, 3 months ago

Selected Answer: C

I didn't know you could mount a S3. But I read the documentation and there are lots of things that must be set up (Private Link, File Gateway) and I am sure these will cost money. Since the question is about more cost effectively, I choose C

upvoted 1 times

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IANNNNNN

2 years, 4 months ago

Selected Answer: D

*cost-effective* https://aws.amazon.com/blogs/storage/mounting-amazon-s3-to-an-amazon-ec2-instance-using-a-private-connection-to-s3-file-gateway/

upvoted 2 times

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m4r0ck

2 years, 4 months ago

Selected Answer: D

D is the best approach as it will make use of s3 as a storage volume without the need to change the application code to include amazon SDK, but rather a simple change in the volume name in the application code would suffice to write files to S3

upvoted 1 times

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pancman

2 years, 4 months ago

Selected Answer: C

C is correct. Yes, S3 can be mounted to an EC2 instance. But you don't need to do that in this scenario. Just use the same S3 bucket and all EC2 instances can access the XML file in S3.

upvoted 1 times

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sichilam

2 years, 5 months ago

I go with A Amazon Elastic Block Store (EBS) Easy to use, high performance block storage at any scale 30 GB of storage for 12 months with the AWS Free Tier Scale fast for your most demanding, high-performance workloads, including mission-critical applications such as SAP, Oracle, and Microsoft products. Protect against failures with 99.999% availability, including replication within Availablity Zone (AZs), and 99.999% durability with io2 Block Express volumes. Select the storage that best fits your workload. Volumes range from cost-effective dollar-per-GB to high performance with the fastest IOPS and throughput.

upvoted 1 times

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Phinx

2 years, 5 months ago

Selected Answer: C

C would be more cost effective. Mounting S3 to EC2 instance needs to use AWS Storage Gateway and will incur additional cost.

upvoted 2 times

Phinx

2 years, 5 months ago

https://aws.amazon.com/blogs/storage/mounting-amazon-s3-to-an-amazon-ec2-instance-using-a-private-connection-to-s3-file-gateway/#:~:text=Using%20this%20solution%20you%20can,to%20change%20any%20source%20code.

upvoted 1 times

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SBoksh

2 years, 7 months ago

Ok going with D then, was unsure about local volume but looks like it is ok. https://bluexp.netapp.com/blog/amazon-s3-as-a-file-system

upvoted 1 times

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SoMaL69

2 years, 7 months ago

Selected Answer: D

I would go with D. https://aws.amazon.com/blogs/storage/mounting-amazon-s3-to-an-amazon-ec2-instance-using-a-private-connection-to-s3-file-gateway/

upvoted 1 times

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SBoksh

2 years, 7 months ago

Selected Answer: C

Although It is possible to mount to S3, but I don't think it is wise to mount as local volume local volumes are subject to the availability of the underlying node and are not suitable for all applications (https://kubernetes.io/docs/concepts/storage/volumes/) https://aws.amazon.com/blogs/storage/mounting-amazon-s3-to-an-amazon-ec2-instance-using-a-private-connection-to-s3-file-gateway/

upvoted 4 times

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