Implementation:Kubeflow Pipelines Application CRD

Knowledge Sources	Kubeflow_Pipelines Kubernetes Application CRD
Domains	Kubernetes, Deployment, CRD
Last Updated	2026-02-13 14:00 GMT

Overview

CustomResourceDefinition manifest registering the `applications.app.k8s.io` CRD, enabling KFP to be represented as a structured Kubernetes Application.

Description

This manifest (531 lines) defines the Application CRD from the upstream `kubernetes-sigs/application` project. It registers the `app.k8s.io` API group with the `Application` kind as a namespaced resource. The CRD includes printer columns for type, version, owner, component readiness, and age. The full OpenAPI v3 schema covers spec fields for descriptor (type, version, description), component groups, info links, and status conditions.

Usage

This CRD must be installed as a cluster-scoped prerequisite before the Application controller or any Application CRs can be created. It is installed via kustomize during KFP deployment.

Code Reference

Source Location

Repository: Kubeflow_Pipelines
File: manifests/kustomize/third-party/application/cluster-scoped/application-crd.yaml
Lines: 1-531

Signature

apiVersion: apiextensions.k8s.io/v1
kind: CustomResourceDefinition
metadata:
  name: applications.app.k8s.io
spec:
  group: app.k8s.io
  names:
    kind: Application
    plural: applications
    shortNames: ["app"]
  scope: Namespaced
  versions:
  - name: v1beta1
    served: true
    storage: true
    # Full OpenAPI v3 schema for Application spec

Import

# Applied via kubectl or kustomize
kubectl apply -f application-crd.yaml

I/O Contract

Inputs

Name	Type	Required	Description
Kubernetes cluster	cluster	Yes	Target cluster with apiextensions.k8s.io/v1 support

Outputs

Name	Type	Description
CRD registration	side effect	Registers applications.app.k8s.io in the cluster API
Application kind	API resource	Enables creating Application custom resources

Usage Examples

Creating a KFP Application Resource

apiVersion: app.k8s.io/v1beta1
kind: Application
metadata:
  name: kubeflow-pipelines
  namespace: kubeflow
spec:
  descriptor:
    type: Kubeflow Pipelines
    version: "2.0"
    description: "ML pipeline platform"
  componentKinds:
  - group: apps
    kind: Deployment
  selector:
    matchLabels:
      app.kubernetes.io/part-of: kubeflow-pipelines

Related Pages

Environment:Kubeflow_Pipelines_Kubernetes_Cluster

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Principle

Implementation

Heuristic

Environment