How do I create custom resource definitions (CRDs) with kubebuilder?

Kubebuilder is a framework for building Kubernetes APIs using custom resource definitions (CRDs). It provides tools and libraries to simplify the process of defining and managing custom resources in Kubernetes.

To create a custom resource definition (CRD) with Kubebuilder, you will follow these general steps:

  1. Set up a new Kubernetes project using Kubebuilder.
  2. Define your API group and version.
  3. Create the API and controller files.
  4. Generate the CRD manifest files.
  5. Deploy your controller and CRDs to the Kubernetes cluster.

Below is an example of how to define a simple custom resource called "Foo" using Kubebuilder:

// api/v1/foo_types.go package v1 import ( metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" ) // FooSpec defines the desired state of Foo type FooSpec struct { Size int `json:"size"` } // Foo is the Schema for the foos API // +kubebuilder:object:root=true type Foo struct { metav1.TypeMeta `json:",inline"` metav1.ObjectMeta `json:"metadata,omitempty"` Spec FooSpec `json:"spec,omitempty"` }

kubebuilder custom resource definitions CRDs Kubernetes API custom resources

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