Deploy the openid helm chart on Azure Kubernetes Service (AKS)

Question

Pulumi · Accepted Answer

In order to deploy the OpenID Helm chart on Azure Kubernetes Service (AKS), we'll follow these steps:

1. Set up an AKS cluster by defining an AKS cluster resource using Pulumi.
2. Configure the Kubernetes provider to connect to the AKS cluster we've created.
3. Deploy the OpenID Helm chart to the AKS cluster using Pulumi's Helm Chart resource.

First, we will define the AKS cluster. For this example, we will use the `azure-native` provider because it represents the native Azure resource provider for Pulumi, offering direct mappings of Azure resources. Specifically, we'll use `azure-native:containerservice:KubernetesCluster` to create an AKS cluster.

After the cluster is created, we will need to obtain the kubeconfig file, which allows us to connect to the Kubernetes cluster with the Kubernetes provider. The kubeconfig is usually generated automatically when an AKS cluster is created, and Pulumi can fetch this programmatically.

Finally, we’ll deploy the OpenID Helm chart by creating a Helm chart resource using the `kubernetes` provider. We will specify the chart name, repository, and any additional configurations required by the chart.

Here's how you can write a Pulumi program in TypeScript to achieve this:

```typescript
import * as pulumi from "@pulumi/pulumi";
import * as azure from "@pulumi/azure-native";
import * as k8s from "@pulumi/kubernetes";

// Step 1: Create an AKS cluster.
const resourceGroup = new azure.resources.ResourceGroup("myResourceGroup");

const aksCluster = new azure.containerservice.KubernetesCluster("myAKSCluster", {
    resourceGroupName: resourceGroup.name,
    agentPoolProfiles: [{
        count: 1,
        vmSize: azure.containerservice.VirtualMachineSizeTypes.Standard_DS2_v2,
        mode: "System",
        name: "agentpool",
    }],
    dnsPrefix: `${pulumi.getStack()}-kube`,
    enableRBAC: true,
    resourceGroupName: resourceGroup.name,
    kubernetesVersion: "1.20.9",
    linuxProfile: {
        adminUsername: "testuser",
        ssh: {
            publicKeys: [{ keyData: "ssh-rsa AAAAB3Nza..." }], // replace with your SSH public key
        },
    },
});

// Step 2: Configure the Kubernetes provider to use the generated kubeconfig from AKS.
const creds = pulumi.all([resourceGroup.name, aksCluster.name]).apply(([rgName, clusterName]) =>
    azure.containerservice.listManagedClusterUserCredentials({
        resourceGroupName: rgName,
        resourceName: clusterName,
    }),
);

const kubeconfig = creds.kubeconfigs[0].value.apply(kubeconfig => Buffer.from(kubeconfig, 'base64').toString());

const k8sProvider = new k8s.Provider("k8sProvider", {
    kubeconfig: kubeconfig,
});

// Step 3: Deploy the OpenID Helm chart into the AKS cluster.
const openidChart = new k8s.helm.v3.Chart("openidChart", {
    chart: "openid-connect",
    version: "1.2.3", // specify the version of the chart you want to deploy
    fetchOpts: {
        repo: "https://your-helm-chart-repository", // replace with the repository URL where your OpenID chart is located
    },
    // Values from the Helm chart's `values.yaml` may be provided here.
    values: {
        // Specify your chart values here.
    },
}, { provider: k8sProvider });

// Export the AKS cluster's kubeconfig.
export const kubeconfigOutput = kubeconfig;

```

This Pulumi program performs the following actions:

- **Step 1**: It creates a new Azure resource group and then an AKS cluster inside this group. The cluster has one node pool with a single VM instance for simplicity. 
  - The `vmSize` and `kubernetesVersion` parameters can be adjusted as needed.
  - You must replace `"ssh-rsa AAAAB3Nza..."` with your own SSH public key for security purposes.

- **Step 2**: It retrieves the kubeconfig from the AKS cluster using `listManagedClusterUserCredentials` which is used later to configure the Kubernetes provider.

- **Step 3**: It deploys the OpenID Helm chart to the AKS cluster with the necessary configurations.
  - You will need to replace `"https://your-helm-chart-repository"` with the URL of your Helm chart repository, and `"openid-connect"` with the name of the OpenID Helm chart (if different).
  - The `values` object is where default chart values can be overridden. Any specific configurations for the OpenID Helm chart should be provided here.

The `"k8sProvider"` is a Kubernetes provider instance created using the kubeconfig output from the AKS cluster, allowing us to connect to the cluster and perform deployments.

Lastly, a pulumi export `kubeconfigOutput` is defined, which will allow you to access the kubeconfig of the AKS cluster from the Pulumi CLI or Pulumi service.

Remember to replace any placeholder data with your own information. Before running this code, ensure you have the Pulumi CLI installed, and you are logged in to the appropriate Pulumi stack. Also, ensure that you are logged in to your Azure account and have the relevant permissions to create the resources defined in the script.