What is Admission Controller?
A Kubernetes plugin that intercepts API requests before objects are persisted.
An Admission Controller is a piece of code that intercepts requests to the Kubernetes API server after authentication and authorization but before objects are stored in etcd. They can validate, mutate, or reject API requests. Common examples include LimitRanger (enforcing resource limits), PodSecurity (enforcing pod security standards), and MutatingWebhookConfiguration. OPA Gatekeeper uses admission webhooks to enforce custom policies.
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More Kubernetes Terms
Auto Scaling
Automatically adjusting the number of compute resources based on demand.
ClusterIP
The default Kubernetes Service type that exposes a service on an internal cluster IP.
ConfigMap
A Kubernetes object for storing non-sensitive configuration data as key-value pairs.
Controller Manager
Kubernetes control plane component running control loops to maintain desired state.
CoreDNS
The default DNS server in Kubernetes clusters for service discovery.
CRD (Custom Resource Definition)
A Kubernetes extension mechanism for defining custom object types.
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