Deploy the powerdns-admin helm chart on Azure Kubernetes Service (AKS)

Question

Pulumi · Accepted Answer

To deploy the `powerdns-admin` Helm chart on Azure Kubernetes Service (AKS), we'll proceed with the following steps:

1. Set up an AKS cluster.
2. Install the Helm chart onto the AKS cluster.

To start with, we need to have the Azure provider configured for Pulumi, which will allow us to provision the AKS cluster to Azure. This assumes you have already logged into Azure CLI and have set up Pulumi with the necessary credentials.

### Step 1: Create an AKS Cluster

We will use `azure-native` provider because it's the most up-to-date and preferred way to interact with Azure resources. The `azure-native` provider closely mirrors Azure APIs and provides the latest Azure features. We will define an AKS cluster which is a managed Kubernetes service that simplifies deploying, managing, and operating Kubernetes on Azure.

### Step 2: Deploy the Helm Chart

For deploying the Helm chart, we will use the Pulumi Kubernetes provider, which allows us to deploy Kubernetes resources, including Helm charts. Helm is a package manager for Kubernetes that packages multiple Kubernetes resources into a single logical deployment unit called a chart.

Let's write the Pulumi program in TypeScript to accomplish this.

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

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

const aksCluster = new azure.containerservice.ManagedCluster("aksCluster", {
    resourceGroupName: resourceGroup.name,
    agentPoolProfiles: [{
        count: 1,
        maxPods: 110,
        mode: "System",
        name: "agentpool",
        osDiskSizeGB: 30,
        osType: "Linux",
        vmSize: "Standard_DS2_v2",
    }],
    dnsPrefix: "dns-prefix", // Replace with a DNS prefix of your choice
    enableRBAC: true
}, { dependsOn: resourceGroup });

const creds = pulumi.all([aksCluster.name, resourceGroup.name]).apply(([name, rgName]) =>
    azure.containerservice.listManagedClusterUserCredentials({
        managedClusterName: name,
        resourceGroupName: rgName,
    }));

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

// Export the kubeConfig as a secret
export const kubeconfig = pulumi.secret(kubeConfig);

// Step 2: Deploy the Helm Chart onto the AKS Cluster
const k8sProvider = new k8s.Provider("k8sProvider", {
    kubeconfig: kubeConfig,
});

const powerdnsAdminChart = new k8s.helm.v3.Chart("powerdns-admin", {
    chart: "powerdns-admin",
    version: "0.2.4", // use the desired chart version
    fetchOpts: {
        repo: "https://url-to-helm-chart-repository", // specify the chart repository URL
    },
}, { provider: k8sProvider });

// Optionally, you can export the public IP address or the domain name of your PowerDNS Admin if it's exposed
```

This program defines the following:

- **Resource Group**: A group to organize all the resources in Azure that will be created.
- **AKS Cluster**: The Kubernetes cluster definition with a single system node pool.
- **KubeConfig**: The configuration needed to communicate with the AKS cluster from Pulumi.
- **Helm Chart**: Deployment of the `powerdns-admin` chart onto the AKS cluster.

Please replace `"dns-prefix"` with your desired DNS prefix and the placeholder `"https://url-to-helm-chart-repository"` with the actual chart repository containing `powerdns-admin`.

When you run this program with `pulumi up`, Pulumi will provision the resources in the order specified, with the AKS cluster being created first followed by the deployment of the PowerDNS Admin chart.

Remember to install the relevant Pulumi providers before running this code:

```bash
$ pulumi plugin install resource azure-native 1.50.0
$ pulumi plugin install resource kubernetes 3.7.1
```

Also, remember to have the Helm CLI installed locally for Pulumi's Helm support to work. You can execute the `pulumi up` command to start provisioning the resources. After the deployment, Pulumi will output the kubeconfig as a secret, which you can use to access your Kubernetes cluster.