AWS EFS
Amazon Elastic File System (EFS) provides scalable, elastic NFS file storage for Linux workloads. Grows and shrinks automatically as files are added and removed.
What is EFS? (Simple Explanation)
EFS is an AWS service in the Storage category. Amazon Elastic File System (EFS) provides scalable, elastic NFS file storage for Linux workloads.
When Would You Use EFS?
- Content management & web serving
- Home directories
- Container storage (ECS/EKS persistent volumes)
- Big data analytics
- Media processing pipelines
Who Uses EFS?
From startups to enterprises, EFS powers:
What Makes EFS Powerful
EFS Pricing & Free Tier
Free Tier: 5GB Standard storage, 20,000 GET requests, 2,000 PUT requests (12 months). After that, ~$0.023/GB/month.
EFS Best Practices
- 1Block all public access by default (never grant s3:* to *)
- 2Enable versioning and MFA delete on critical buckets
- 3Use lifecycle policies to automatically tier to Glacier after 90 days
- 4Encrypt at rest with SSE-KMS (not SSE-S3)
- 5Enable S3 Access Logs or CloudTrail data events for audit trail
Getting Started with EFS in 5 Minutes
- 1Open the AWS Console and navigate to EFS
- 2Click "Create bucket" or "Create file system"
- 3Name your resource (globally unique for S3) and choose a region
- 4Configure public access settings (block all public access by default) and click "Create"
EFS CLI Quick Reference
1 production-ready commands. Full CLI Library (225+ services) →
aws efs describe-file-systems --query 'FileSystems[*].{ID:FileSystemId,Name:Name,State:LifeCycleState,Size:SizeInBytes.Value}' --output tableList all EFS file systems with sizePros & Cons of EFS
Pros
- Elastic capacity — no provisioning required
- Four storage classes: Standard, IA, Archive, One Zone
- 99.999999999% durability
- Lifecycle policies for automatic tiering
- Encryption at rest and in transit
Cons
- ✕Storage costs compound over time — data tends to grow, not shrink
- ✕Cross-region replication adds latency and egress costs
- ✕Inexperienced users can accidentally expose data publicly (misconfigured bucket policies)
EFS vs Alternatives
EFS vs EC2
Choose EFS for Content management & web serving and Home directories. It excels at elastic capacity — no provisioning required.
Choose EC2 as an alternative when your requirements differ. Each service in the Storage category serves different architectural patterns.
Services That Work with EFS
EFS is rarely used alone. It is typically combined with:
Compliance & Security
How AWS EFS fits into major compliance standards. Browse all 41 frameworks →
EFS configuration is audited by CIS Benchmarks v1.5–v3.0 for secure cloud defaults.
NIST 800-53EFS access controls, encryption, and audit logging map to NIST 800-53 AC, SC, and AU control families.
PCI DSS 4.0EFS encryption, access control, and logging support PCI DSS for cardholder data environments.
SOC 2EFS security, availability, and confidentiality controls evaluated under SOC 2 Trust Services Criteria.
ISO 27001EFS configuration and monitoring controls map to ISO 27001 Annex A information security management.
Frequently Asked Questions About EFS
What is AWS EFS?
Amazon Elastic File System (EFS) provides scalable, elastic NFS file storage for Linux workloads. Grows and shrinks automatically as files are added and removed.
What is EFS used for?
EFS is commonly used for: Content management & web serving; Home directories; Container storage (ECS/EKS persistent volumes); Big data analytics; Media processing pipelines. It's a core service in the storage category of AWS.
Is EFS free?
Free Tier: 5GB Standard storage, 20,000 GET requests, 2,000 PUT requests (12 months). After that, ~$0.023/GB/month.
What are the key features of EFS?
EFS's most important capabilities include: Elastic capacity — no provisioning required. Four storage classes: Standard, IA, Archive, One Zone. 99.999999999% durability. Lifecycle policies for automatic tiering. Encryption at rest and in transit. Each of these is designed to help teams content management & web serving.
How does EFS compare to alternatives?
EFS competes with both AWS-native alternatives (EC2, ECS, EKS) and third-party equivalents. The right choice depends on your specific requirements for scalability, cost, and operational overhead. See the comparisons section below for detailed guidance.
Which compliance frameworks apply to EFS?
CIS AWS v3.0: EFS configuration is audited by CIS Benchmarks v1.5–v3.0 for secure cloud defaults. NIST 800-53: EFS access controls, encryption, and audit logging map to NIST 800-53 AC, SC, and AU control families. PCI DSS 4.0: EFS encryption, access control, and logging support PCI DSS for cardholder data environments. SOC 2: EFS security, availability, and confidentiality controls evaluated under SOC 2 Trust Services Criteria. ISO 27001: EFS configuration and monitoring controls map to ISO 27001 Annex A information security management.
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