Why you need a Kubernetes admission controller

Kubernetes admission controllers intercept authenticated and authorized API requests before resources are persisted, allowing them to modify or reject most non-read operations and thereby enforce operational defaults, resource controls, and security policies. Built-in controllers such as DefaultIngressClass, DefaultStorageClass, LimitRanger, and EventRateLimit help automate configuration, enable storage provisioning, prevent resource exhaustion in multitenant clusters, and reduce event flooding. Kubernetes also supports runtime-configured mutating and validating admission webhooks, which respectively alter resources or determine whether they are allowed to proceed. As Kubernetes deployments increasingly require stronger tenant isolation and policy enforcement, external engines such as OPA Gatekeeper, which uses Rego, and Kyverno, which defines policies as Kubernetes resources, provide broader policy capabilities. Organizations can also implement custom webhook-based controllers in languages capable of handling HTTP and JSON, deploying them like ordinary applications and returning admission responses that approve or deny requests, although secure TLS communication is recommended.

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