How to Use Kubernetes CRDs

Kubernetes CRDs

Custom resources (CRDs) are an efficient way of extending Kubernetes APIs, allowing us to make customized and declarative APIs. When we create a new CRD API, the kube-apiserver will create a new RESTful handler for each specified version. We’ll demonstrate this shortly. The CRD can define either namespaced or cluster-scoped APIs, as specified in the field spec.scope.

Now, let’s get started on how to use CRDs in Kubernetes.

Create a custom resource

The development environment in which we can add and modify our programs is given below. We can click the “Run” button to initialize it.

In the crd.yml file, we define the CRD for the kind Foo (line 31) with the API group pwk.educative.io (line 6). This Foo kind ...