Workload identity is a specific type of machine identity assigned to software-based entities — containers, serverless functions, VMs, microservices — enabling them to authenticate to other services and APIs using cloud-native identity mechanisms rather than static credentials.
⚙️ How Does It Work?
Cloud platforms assign short-lived, automatically rotated identity tokens to workloads. Kubernetes uses service account tokens or Workload Identity Federation. Applications exchange these tokens for access to cloud resources without any long-lived credentials.
📍 Where Is It Used?
Cloud-native environments (Kubernetes, serverless, containers), any cloud workload accessing other cloud services (databases, storage, APIs).
💡 Real-World Example
A GCP Cloud Run service needs to access BigQuery. Instead of a service account key (static, high-risk), it uses GCP Workload Identity Federation. The Cloud Run instance automatically gets a short-lived identity token bound to its specific service account — no key files, no rotation burden.
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