For example, the LimitRanger admission controller can augment pods with default resource requests and limits (mutating phase), as well as verify that pods with explicitly set resource requirements do not exceed the per-namespace limits specified in the LimitRange object (validating phase). Consequently, admission controllers can act as mutating or validating controllers or as a combination of both. The admission control process has two phases: the mutating phase is executed first, followed by the validating phase. They can be thought of as a gatekeeper that intercept (authenticated) API requests and may change the request object or deny the request altogether. In a nutshell, Kubernetes admission controllers are plugins that govern and enforce how the cluster is used.

What are Kubernetes admission controllers? The following must-know tips and tricks will help you leverage admission controllers to make the most of these security capabilities in Kubernetes. A more recent introduction in security features is a set of plugins called вЂњ admission controllers.вЂќ Admission controllers must be enabled to use some of the more advanced security features of Kubernetes, such as pod security policies that enforce a security configuration baseline across an entire namespace. Kubernetes also provides a range of features that secure production workloads. Kubernetes has emerged as the de facto standard in container orchestrators thanks to its flexibility, scalability, and ease of use. Kubernetes has greatly improved the speed and manageability of backend clusters in production today.

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