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====== IRSA Flow (Pod → SA → IAM Role → STS) ======

**What it is:** The step-by-step flow of how IRSA enforces AWS permissions per Pod.

**What it’s for:**
  * Implement least privilege for microservices on EKS.
  * Explain why node instance role is too broad.

**Flow (high level):**
  * Create separate Kubernetes service accounts (UI-SA, Data-SA).
  * Create separate IAM roles (UI-Role, Data-Role).
  * Attach minimal policies:
    * UI-Role → DynamoDB-only policy
    * Data-Role → S3-only policy
  * Configure OIDC provider for the cluster ([[aws:containers:eks:oidc|OIDC Provider]]).
  * Annotate each service account with its role ARN (IRSA mapping).
  * Pods use their service account; AWS STS issues temporary credentials for that role.

**Why not “node instance role” (EC2 instance profile):**
  * Node role is shared by all Pods on the node.
  * If you attach both S3 and DynamoDB policies there, **every Pod** can access both → violates least privilege.

**Hard words:**
  * *flow* /floʊ/: luồng
  * *minimal* /ˈmɪnɪməl/: tối thiểu
  * *temporary credentials* /ˈtɛmpəˌrɛri krəˈdɛnʃəlz/: thông tin tạm thời
  * *violates* /ˈvaɪəleɪts/: vi phạm