AWS EKS Pod Identity: Practical Migration Guide from IRSA With Key Pitfalls

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AWS introduced EKS Pod Identity at re:Invent 2023 as a simpler alternative to the widely used IRSA (IAM Roles for Service Accounts) mechanism for managing IAM credentials on EKS workloads. Unlike IRSA, which relies on per-cluster OIDC federation and mutating webhooks, Pod Identity uses a daemonset agent and a PodIdentityAssociation resource that maps a cluster, namespace, and service account to an IAM role. The migration involves enabling the Pod Identity Agent add-on, updating role trust policies to include the new pods.eks.amazonaws.com principal, and creating the necessary associations — all without requiring a hard cutover, since both trust paths can coexist. Engineers are advised to verify credential assumption via CloudTrail or application logs before removing legacy IRSA annotations, and to run both trust paths in parallel for at least one deployment cycle per workload. Key benefits over IRSA include a uniform trust policy shape across roles, simplified auditing, easier cross-account role reuse, and faster proactive credential rotation by the agent.

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