Deploy the terraform-cloud helm chart on Azure Kubernetes Service (AKS)

Question

Pulumi · Accepted Answer

To deploy the `terraform-cloud` Helm chart on Azure Kubernetes Service (AKS), you first need to provision an AKS cluster and then use the Helm chart resource to deploy the application. We will follow these steps:

1. **Provision an AKS Cluster:** Set up a Kubernetes cluster on Azure using the `azure-native` Pulumi package. This represents the environment where your Helm chart will be deployed.
2. **Deploy Helm Chart:** Use the `kubernetes` Pulumi package to deploy the `terraform-cloud` chart to your AKS cluster.

We'll use TypeScript for our Pulumi program, as it's one of the most commonly used languages for Pulumi and cloud resource management in general.

Below is a detailed Pulumi program that carries out the task:

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

// Initialize Azure provider to use managed identity to authenticate
const azureProvider = new azure_native.Provider("provider", {
    useAzCLIStatelessAuth: true,
});

// Provision an AKS cluster using the Azure native provider
const resourceGroupName = "aksResourceGroup";
const aksClusterName = "aksCluster";

// Create a resource group to contain the AKS cluster
const resourceGroup = new azure_native.resources.ResourceGroup(resourceGroupName, {}, { provider: azureProvider });

// Create the AKS Cluster
const aksCluster = new azure_native.containerservice.ManagedCluster(aksClusterName, {
    resourceGroupName: resourceGroup.name,
    agentPoolProfiles: [{
        count: 1,
        maxPods: 110,
        mode: "System",
        name: "agentpool",
        osDiskSizeGB: 30,
        osType: "Linux",
        vmSize: "Standard_DS2_v2",
    }],
    dnsPrefix: "aksk8s"
}, { provider: azureProvider });

// Export the kubeconfig of the AKS cluster
export const kubeConfig = aksCluster.kubeConfig.apply(result => {
    if (result === undefined) {
        throw new Error("Failed to retrieve kubeconfig");
    }
    return result;
});

// Create a Kubernetes provider instance that uses the AKS kubeconfig
const k8sProvider = new k8s.Provider("k8sProvider", {
    kubeconfig: kubeConfig,
});

// Deploy the terraform-cloud Helm chart using the Kubernetes provider
const terraformCloudChart = new k8s.helm.v3.Chart("terraform-cloud", {
    chart: "terraform-cloud",
    fetchOpts: {
        repo: "https://your-helm-chart-repository/", // Replace with the actual repository URL if required
    },
}, { provider: k8sProvider });

// Export the public IP address of the service, if available
export const publicEndpoint = terraformCloudChart.getResourceProperty("v1/Service", "terraform-cloud", "status").apply(status => {
    if (status.loadBalancer?.ingress) {
        return status.loadBalancer.ingress[0].ip;
    } else {
        return "Not assigned";
    }
});
```

### Explanation:

- **Resource Group (`ResourceGroup`):** This sets up a resource group which acts as a logical container for your AKS cluster on Azure.
- **AKS Cluster (`ManagedCluster`):** The AKS cluster is set up with a single agent node pool. The node pool contains the underlying VMs that run your container workloads.
- **Kubernetes Provider (`Provider`):** To interact with your AKS cluster and deploy resources, we use a Pulumi Kubernetes provider initialized with the kubeconfig from the AKS cluster.
- **Helm Chart (`Chart`):** The `terraform-cloud` Helm chart is deployed to your AKS cluster. Replace `"https://your-helm-chart-repository/"` with the actual Helm repository URL that hosts your chart.
- **Exported Outputs:** At the end, we export the kubeconfig and, if possible, the public IP address of the Helm-deployed service to access it from outside.

### What's Next?

To execute this program:

1. Install Pulumi and configure it to use your Azure Subscription.
2. Write the above TypeScript code in a file named `index.ts`.
3. Install the required dependencies with npm:
   ```bash
   npm install @pulumi/pulumi @pulumi/azure-native @pulumi/kubernetes
   ```
4. Compile the TypeScript program:
   ```bash
   tsc
   ```
5. Deploy the AKS cluster and the Helm chart by running:
   ```bash
   pulumi up
   ```
   
When running `pulumi up`, the program will prompt you for confirmation to create the described resources. After reviewing the proposed changes, agree, and Pulumi will provision the AKS cluster and deploy your `terraform-cloud` Helm chart.

**Please ensure that you replace the placeholder Helm chart repository URL with the correct one for the `terraform-cloud` chart.** If you do not have a specific repository and chart name, you would need to provide these details for the deployment to work.