What are Kubernetes admission controllers and how do they enhance security?

What are Kubernetes admission controllers and how do they enhance security?

Kubernetes admission controllers are plugins that govern and enforce how the cluster is used. They can validate, mutate, or reject requests to the Kubernetes API, enhancing security by ensuring that only compliant configurations are allowed.

Can you give me examples of admission controllers?

Sure! Some common admission controllers include the NamespaceLifecycle, which prevents the deletion of namespaces with resources, and the PodSecurityPolicy, which controls the security contexts of pods.

How do I configure an admission controller?

To configure an admission controller, you typically need to modify the API server's startup parameters to include the desired controllers and their configurations. This can be done in the Kubernetes manifest or through command-line flags.

What are the security implications of using admission controllers?

Using admission controllers can significantly enhance security by enforcing policies and preventing misconfigurations. However, if not configured correctly, they can also introduce vulnerabilities or block legitimate requests.