AWS Certified Solutions Architect - Associate
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A company is migrating a Linux-based web server group to AWS. The web servers must access files in a shared file store for some content. The company must not make any changes to the application. What should a solutions architect do to meet these requirements?
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A
Create an Amazon S3 Standard bucket with access to the web servers.
B
Configure an Amazon CloudFront distribution with an Amazon S3 bucket as the origin.
C
Create an Amazon Elastic File System (Amazon EFS) file system. Mount the EFS file system on all web servers.
D
Configure a General Purpose SSD (gp3) Amazon Elastic Block Store (Amazon EBS) volume. Mount the EBS volume to all web servers.
Explanation:
Explanation
Correct Answer: C - Create an Amazon Elastic File System (Amazon EFS) file system and mount it on all web servers.
Why this is correct:
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Shared File System Requirement: The scenario requires a "shared file store" that multiple web servers can access simultaneously. Amazon EFS is specifically designed as a fully managed, scalable, shared file system for Linux-based applications.
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No Application Changes: The requirement states "must not make any changes to the application." EFS provides a standard NFSv4 interface that can be mounted on Linux instances, allowing applications to access files using standard file system operations without code modifications.
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Multi-Server Access: EFS supports concurrent access from multiple EC2 instances, making it ideal for web server clusters that need to share content.
Why other options are incorrect:
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A (Amazon S3): S3 is an object storage service, not a file system. While it can store files, it requires application changes to use S3 APIs instead of standard file system operations.
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B (CloudFront with S3): This is for content delivery and caching, not for providing a shared file store that web servers can directly access for reading/writing files.
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D (EBS volume): EBS volumes can only be attached to a single EC2 instance at a time. They cannot be simultaneously mounted to multiple web servers, which violates the shared access requirement.
Key AWS Services Comparison:
- EFS: Shared file system for Linux, NFS protocol, multi-attach support
- EBS: Block storage, single-attach only (except for specific multi-attach volumes with limitations)
- S3: Object storage, requires API access
- CloudFront: CDN for content delivery
This solution meets all requirements: shared file access, no application changes, and Linux compatibility.
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