Admission Controllers
Admission Controllers are a Kubernetes security and governance feature that intercepts requests to the Kubernetes API server before object persistence, allowing validation, mutation, or denial of operations. They enforce policies, validate resource configurations, and modify requests to ensure compliance with cluster standards. This mechanism is critical for maintaining security, resource management, and operational consistency in Kubernetes environments.
Developers should learn and use Admission Controllers when deploying applications on Kubernetes to enforce security policies, validate configurations, and automate governance. Specific use cases include preventing insecure deployments, injecting sidecar containers, setting resource limits, and ensuring compliance with organizational standards. They are essential for production-grade Kubernetes clusters to mitigate risks and streamline operations.