How do I build a Kubernetes core namespacepatch?

In this guide, we will create and patch a Kubernetes namespace using Pulumi. We will define a namespace and then apply a patch to it. This is useful for updating metadata or other properties of an existing namespace without recreating it.

Key Points

• Create a Kubernetes namespace.
• Apply a patch to the namespace.
• Use Pulumi’s infrastructure as code to manage and update Kubernetes resources.

Detailed Steps

1. Create a Kubernetes Namespace: Define a namespace with specific metadata.
2. Patch the Namespace: Apply a patch to update properties of the namespace.

Below is the complete Pulumi program to achieve this:

import * as pulumi from "@pulumi/pulumi";
import * as k8s from "@pulumi/kubernetes";

// Define the initial namespace
const myNamespace = new k8s.core.v1.Namespace("my-namespace", {
    metadata: {
        name: "my-namespace",
        labels: {
            "environment": "dev",
        },
    },
});

// Patch the namespace to add or modify metadata
const patchedNamespace = new k8s.core.v1.NamespacePatch("my-namespace-patch", {
    metadata: {
        name: "my-namespace",
        annotations: {
            "patched-by": "pulumi",
        },
    },
    spec: {
        finalizers: ["kubernetes"],
    },
}, { dependsOn: [myNamespace] });

Summary

In this example, we created a Kubernetes namespace named my-namespace and then applied a patch to add an annotation and a finalizer to it. This demonstrates how to manage and update Kubernetes resources using Pulumi’s infrastructure as code approach.