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How IAM Roles Form the Foundation of Production-Grade AWS Infrastructure

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A developer series on building production-grade AWS infrastructure has reached Part 3, focusing on Identity and Access Management (IAM) using Terraform. Because AWS operates on a deny-by-default permissions model, IAM roles must be configured before any other service — such as VPCs, ECS tasks, or S3 buckets — can function. Unlike IAM users, which are tied to human credentials, IAM roles issue temporary security credentials that AWS services like ECS can assume programmatically. The guide highlights a key architectural split between an ECS execution role, which allows the ECS agent to pull container images and read secrets, and a separate application-level role for runtime permissions. Common beginner mistakes covered include misusing the principals block, applying unnecessary external ID conditions, and creating a single catch-all role instead of purpose-specific ones.

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