Using kubernetes aadpodidentity.k8s.io with pkg.crossplane.io

Question

Pulumi · Accepted Answer

Creating a setup with Kubernetes where Azure Active Directory (AAD) identities are used within a Kubernetes cluster can indeed be complex. aadpodidentity.k8s.io is typically a Kubernetes CRD (Custom Resource Definition) provided by the AAD Pod Identity project for Azure Kubernetes Service (AKS). It enables AKS clusters to assign Azure Active Directory identities to pods.

On the other hand, pkg.crossplane.io refers to Crossplane, an open-source Kubernetes add-on that extends clusters to orchestrate any infrastructure or managed service from Kubernetes. It allows you to manage infrastructure through Kubernetes-style resources and abstractions.

Integrating AAD Pod Identity with Crossplane would generally involve the following major steps:

Set up Crossplane in your Kubernetes cluster.
Install necessary Crossplane provider packages (such as provider-azure) to manage Azure resources.
Define AzureIdentity and AzureIdentityBinding resources which are part of AAD Pod Identity.
Use these resources to allow your pods to assume an Azure Active Directory identity.

Let's go through a program in TypeScript using Pulumi with Crossplane to set up an AzureActiveDirectoryIdentity and its binding for pods in the Kubernetes cluster. This will not directly use AAD Pod Identity resources, as Crossplane might use its own custom abstractions, but it will provide a similar outcome.

First, you should have the Crossplane Kubernetes provider configured along with the necessary permissions and configuration to manage resources in Azure.

Below is a simplified Pulumi program that outlines the general setup:

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

// Initialize a new Pulumi stack.
const stack = pulumi.getStack();

// Configure Kubernetes provider to deploy resources to our existing cluster.
const k8sProvider = new k8s.Provider("k8s-provider", {
  kubeconfig: "<Your KUBECONFIG content here>" // You should replace this with your KUBECONFIG
});

// Install the Crossplane Helm chart into the cluster.
const crossplaneChart = new k8s.helm.v3.Chart("crossplane", {
  chart: "crossplane",
  version: "1.6.1", // Use the latest stable version
  namespace: "crossplane-system",
  fetchOpts: {
    repo: "https://charts.crossplane.io/stable",
  },
}, { provider: k8sProvider });

// Install the Crossplane Azure provider.
// If you're using Crossplane v1, the package name will be "provider-azure".
const providerAzure = new crossplane.Provider("provider-azure", {
  provider: "azure",
  revision: "v0.20.0", // Use the version compatible with your Crossplane version
}, { provider: k8sProvider });

// Define the Azure Identity.
const azureIdentity = new k8s.apiextensions.CustomResource("azure-identity", {
  apiVersion: "aadpodidentity.k8s.io/v1",
  kind: "AzureIdentity",
  metadata: {
    name: "example-identity",
  },
  spec: {
    type: 0, // 0 for user-assigned identity, 1 for system-assigned identity
    resourceID: "<Your Azure user-assigned managed identity resource ID here>",
    clientID: "<Your Azure user-assigned managed identity client ID here>",
  },
}, { provider: k8sProvider });

// Define the Azure Identity Binding.
const azureIdentityBinding = new k8s.apiextensions.CustomResource("azure-identity-binding", {
  apiVersion: "aadpodidentity.k8s.io/v1",
  kind: "AzureIdentityBinding",
  metadata: {
    name: "example-identity-binding",
  },
  spec: {
    azureIdentity: azureIdentity.metadata.name,
    selector: "example-selector",
  },
}, { provider: k8sProvider, dependsOn: azureIdentity });

// Export the kubeconfig to access the cluster.
export const kubeconfig = k8sProvider.kubeconfig;

Please replace the placeholder values with your actual values:

kubeconfig: Your Kubernetes cluster config file content.

You need to have the AAD Pod Identity components installed in your cluster for the AzureIdentity and AzureIdentityBinding resources to be recognized and for their respective controllers to act upon those resources.

Please note that with updates to the technologies mentioned, the actual setup might differ. It's important to always refer to the latest documentation from both Crossplane and AAD Pod Identity.

For Crossplane specific documentation, refer to: Crossplane documentation For Azure Active Directory Pod Identity details, check: Azure AD Pod Identity (Note: This link is not managed by Pulumi and is provided for informational purposes)

Remember, the code provided here is supposed to run on Pulumi with an environment where Crossplane and the Kubernetes cluster are already configured. This is only a template, and real-world use may require additional setup like proper role assignments and permissions in Azure.