Decoupling & Securing Web App Storage: Building a Zero-Trust S3 Perimeter with Terraform

Short summary

This tutorial shows how to secure Amazon S3 media storage for multi-AZ web applications by implementing a Zero-Trust network perimeter with Terraform. Instead of relying on IAM identity alone, it enforces network-level isolation using a VPC Gateway Endpoint and a restrictive bucket policy that denies all S3 access unless requests originate from a specific VPC Endpoint ID. The author warns about a common sequencing trap where applying the strict Deny policy too early can lock teams out of their own bucket.

• •Offload EC2 local media to S3 to survive auto-scaling instance termination
• •Use a VPC Gateway Endpoint plus bucket policy Deny-on-sourceVpce to enforce network-level Zero-Trust
• •Apply the restrictive policy only after route tables and CI/CD exceptions are fully configured to avoid self-lockout

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