Observed Signal · Jul 1, 2026 · Technical Tutorial · Source: DEV Community · Impact: 1/5 · Sentiment: Neutral
AWS EFS Essentials: Shared File Storage for EC2
Technical tutorial and hands-on lab explaining Amazon EFS (Elastic File System). The article defines EFS as a fully managed, serverless NFS v4.1 file system that multiple EC2 instances can mount and read/write simultaneously. It covers architecture (mount targets/ENIs per AZ), security group configuration, mounting commands and persistence, storage classes (Standard and Infrequent Access) with lifecycle management, performance and throughput modes, encryption (KMS at rest, TLS in transit), pricing considerations, and a step-by-step lab to create two EC2 instances, configure EFS and demonstrate shared file access. The post is an instructional resource for engineers learning cloud storage patterns on AWS.
Practical technical tutorial about AWS EFS useful to cloud engineers; low direct impact on the AdTech/MarTech industry and not industry-shifting.
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Key Takeaways & Evidence Grounding
- Amazon EFS is a fully managed, serverless shared file system using NFS v4.1 that multiple EC2 instances can mount and read/write concurrently.
- EFS stores data redundantly across multiple Availability Zones and auto-scales from kilobytes to petabytes without manual capacity provisioning.
- EFS exposes one mount target per AZ (an ENI with a private IP and security group); EC2 instances in an AZ connect to the local mount target over NFS (port 2049).
- EFS supports two storage classes (Standard and Infrequent Access) and Lifecycle Management to auto-move files to IA after configurable inactivity periods (7/14/30/60/90 days).
- Performance modes (General Purpose, Max I/O) are set at creation; throughput modes (Bursting, Provisioned, Max I/O) can be changed later. Encryption: at-rest via AWS KMS and in-transit via TLS.
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Amazon Launches S3 Files: File-System Access to S3
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Amazon S3 Basics for Beginners
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Clear Guide to AWS Security and Storage
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