Kubernetes Custom Resource Definitions

E699333

Kubernetes API extension mechanism Kubernetes resource type

Kubernetes Custom Resource Definitions are an extension mechanism in Kubernetes that let users define and manage their own custom resource types alongside built-in Kubernetes objects.

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All labels observed (11)

Label	Occurrences
Kubernetes Custom Resource Definitions canonical	8
CustomResourceDefinition	3
CustomResourceDefinitions (CRDs)	1
Istio CRDs	1
Knative configuration resources	1
Kubernetes API Extensions	1
Kubernetes CRDs	1
Kubernetes Custom Resources	1
Kubernetes CustomResourceDefinitions	1
Kubernetes operators	1
MachineConfig custom resource	1

How this entity was disambiguated

This entity first appeared as the object of triple T7939855 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: Kubernetes Custom Resource Definitions
Context triple: [Argo CD, uses, Kubernetes Custom Resource Definitions]

A. Kubernetes
Kubernetes is an open-source container orchestration platform that automates the deployment, scaling, and management of containerized applications across clusters of machines.
B. Alibaba Cloud Container Service for Kubernetes
Alibaba Cloud Container Service for Kubernetes is a managed Kubernetes platform that simplifies deploying, scaling, and operating containerized applications on Alibaba Cloud infrastructure.
C. Argo CD
Argo CD is a declarative, GitOps-based continuous delivery tool that automates application deployment and lifecycle management on Kubernetes clusters.
D. Kubernetes service
A Kubernetes service is a managed cloud offering that provides orchestration, deployment, scaling, and management of containerized applications using the open-source Kubernetes platform.
E. Oracle Container Engine for Kubernetes
Oracle Container Engine for Kubernetes is a managed Kubernetes service on Oracle Cloud Infrastructure that simplifies deploying, managing, and scaling containerized applications.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: Kubernetes Custom Resource Definitions
Target entity description: Kubernetes Custom Resource Definitions are an extension mechanism in Kubernetes that let users define and manage their own custom resource types alongside built-in Kubernetes objects.

A. Kubernetes
Kubernetes is an open-source container orchestration platform that automates the deployment, scaling, and management of containerized applications across clusters of machines.
B. Alibaba Cloud Container Service for Kubernetes
Alibaba Cloud Container Service for Kubernetes is a managed Kubernetes platform that simplifies deploying, scaling, and operating containerized applications on Alibaba Cloud infrastructure.
C. Argo CD
Argo CD is a declarative, GitOps-based continuous delivery tool that automates application deployment and lifecycle management on Kubernetes clusters.
D. Kubernetes service
A Kubernetes service is a managed cloud offering that provides orchestration, deployment, scaling, and management of containerized applications using the open-source Kubernetes platform.
E. Oracle Container Engine for Kubernetes
Oracle Container Engine for Kubernetes is a managed Kubernetes service on Oracle Cloud Infrastructure that simplifies deploying, managing, and scaling containerized applications.
F. None of above. chosen

Statements (54)

Predicate	Object
instanceOf	Kubernetes API extension mechanism ⓘ Kubernetes resource type ⓘ
alsoKnownAs	CRD ⓘ
apiGroup	apiextensions.k8s.io ⓘ
apiVersion	apiextensions.k8s.io/v1 ⓘ
appliesTo	entire Kubernetes cluster ⓘ
belongsTo	Kubernetes API Extensions ⓘ linked to: Kubernetes Custom Resource Definitions
definedIn	Kubernetes API server ⓘ linked to: kube-apiserver
documentedAt	https://kubernetes.io/docs/tasks/extend-kubernetes/custom-resources/custom-resource-definitions/ ⓘ
enables	declarative management of custom resources ⓘ definition of custom resource types ⓘ extension of Kubernetes API without recompiling API server ⓘ
field	metadata ⓘ spec ⓘ status ⓘ
governedBy	Kubernetes RBAC ⓘ
introducedInVersion	Kubernetes 1.7 ⓘ
kind	CustomResourceDefinition ⓘ linked to: Kubernetes Custom Resource Definitions
lifecycle	created updated and deleted like built-in resources ⓘ
managedBy	cluster administrators ⓘ
namesField	categories ⓘ kind ⓘ
namesField	plural ⓘ shortNames ⓘ singular ⓘ
relatedTo	Kubernetes API Aggregation Layer ⓘ Kubernetes Admission Webhooks ⓘ linked to: Kubernetes admission webhooks Kubernetes Operator pattern ⓘ
replaced	ThirdPartyResource ⓘ
scopeValue	Cluster ⓘ
scopeValue	Namespaced ⓘ
specField	conversion ⓘ group ⓘ names ⓘ preserveUnknownFields ⓘ scope ⓘ versions ⓘ
storedIn	etcd via Kubernetes API server ⓘ
supports	OpenAPI v3 validation schemas ⓘ additional printer columns ⓘ defaulting via schema ⓘ kubectl CRUD operations on custom resources ⓘ multiple API versions for a single custom resource ⓘ served and storage flags per version ⓘ structural schemas ⓘ subresources scale ⓘ subresources status ⓘ validation via admission webhooks ⓘ version deprecation ⓘ webhook-based conversion ⓘ
usedFor	building Kubernetes-native applications ⓘ domain-specific configuration management ⓘ implementing Kubernetes operators ⓘ platform and infrastructure abstractions ⓘ

How these facts were elicited

Referenced by (20)

Full triples — surface form annotated when it differs from this entity's canonical label.

Argo CD → uses → Kubernetes Custom Resource Definitions ⓘ

Kubeflow Pipelines → uses → Kubernetes Custom Resource Definitions ⓘ

Vitess → integratesWith → Kubernetes operators ⓘ