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

Question

Pulumi · Accepted Answer

To deploy the `stunnel` Helm chart on Azure Kubernetes Service (AKS), we will follow these steps:

1. **Set up AKS Cluster**: We will create an AKS cluster using the `azure-native` package, which is the Azure Resource Manager for Pulumi. This package provides the native Azure API types to work with AKS.
  
2. **Install the Helm Chart**: Using the `kubernetes` package, we will deploy the Helm chart for `stunnel`. Helm is a package manager for Kubernetes, which simplifies deployment of applications and services.

Here is how the TypeScript code using Pulumi looks:

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

// Step 1: Create an Azure Resource Group to contain the AKS cluster
const resourceGroup = new azure_native.resources.ResourceGroup("resourceGroup");

// Step 2: Create the AKS Cluster within the Resource Group
const cluster = new azure_native.containerservice.ManagedCluster("aksCluster", {
    resourceGroupName: resourceGroup.name,
    // Specify other required parameters for AKS setup as per your requirements.
    // Note that parameters like location are picked from the Resource Group if not specified.
});

// Step 3: Obtain the KubeConfig from the created AKS cluster
const creds = pulumi.all([cluster.name, resourceGroup.name]).apply(([name, rgName]) => {
    return azure_native.containerservice.listManagedClusterUserCredentials({
        resourceName: name,
        resourceGroupName: rgName,
    });
});

const kubeconfig = creds.apply(c => {
    // Extract the kubeconfig from the AKS cluster
    const encoded = c.kubeconfigs[0].value;
    if (encoded === undefined) {
        throw new Error("Kubeconfig is undefined");
    }
    return Buffer.from(encoded, 'base64').toString();
});

// Step 4: Set up the Helm Chart resource for stunnel
const stunnelChart = new kubernetes.helm.v3.Chart("stunnel", {
    chart: "stunnel",
    // Set the version of the Helm chart, if needed
    // version: "<CHART_VERSION>",
    // Add the values for the helm chart
    values: {
        // Provide your stunnel configuration values here
        // Example:
        // service: {
        //     type: "ClusterIP",
        //     port: 80
        // },
    },
}, { provider: new kubernetes.Provider("k8sProvider", { kubeconfig }) });

// Export the K8s provider's kubeconfig for easy access to the cluster after deployment
export const kubeconfigOutput = kubeconfig;
```

### Explanation:

- **Resource Group**: A resource group in Azure is a container that holds related resources. We create one to logically organize the AKS cluster within it.

- **AKS Cluster**: `ManagedCluster` is the resource we use to create an instance of AKS. Here, you have to provide various other configurations depending on your needs, such as the node size, the node count, and more.

- **KubeConfig**: It is essential to interact with the AKS cluster. The `listManagedClusterUserCredentials` function retrieves credentials that we format as `kubeconfig`.

- **Helm Chart for stunnel**: The `Chart` resource from the `@pulumi/kubernetes` package is used to deploy the `stunnel` chart found on a Helm repository.

Keep in mind that the `values` object within the `stunnelChart` definition needs to be populated according to the `stunnel` Helm chart's values that you want to configure.

Lastly, we export `kubeconfigOutput`, which you can use to interact with your AKS cluster using `kubectl` after the Pulumi program has successfully run. Make sure to replace the Helm chart specific details like version or chart repository with the actual ones you intend to use.