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

Question

Pulumi · Accepted Answer

Deploying a multi-tenant Helm chart to Azure Kubernetes Service (AKS) involves several steps: setting up the AKS cluster, and then deploying the Helm chart onto the cluster. Pulumi allows us to define our entire infrastructure as code, simplifying the deployment and management of cloud resources.

Below you'll find a Pulumi program written in TypeScript that illustrates how to accomplish this. First, we'll create an instance of an AKS cluster, and then we'll deploy a Helm chart to this cluster. In this example, we're assuming that you have a multi-tenant Helm chart available, and we'll provide a Helm release from the chart on the AKS cluster.

### Explanation

1. **Azure Kubernetes Service (AKS) Cluster**: We'll use `azure-native.hybridcontainerservice.ProvisionedCluster` to create a new AKS cluster in Azure.
2. **Helm Chart**: We use `kubernetes.helm.v3.Chart` to deploy a Helm chart onto a Kubernetes cluster. You'll need to provide the name of the chart and repository or local path.

For simplicity, we'll use dummy values for the Helm chart and AKS properties. You should replace these with the actual values you wish to use.

### The Program

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

// Step 1: Create an Azure Resource Group
const resourceGroup = new azure_native.resources.ResourceGroup("myResourceGroup", {
    location: 'East US', // You can change the location as per your requirements.
});

// Step 2: Create an AKS cluster
const cluster = new azure_native.hybridcontainerservice.ProvisionedCluster("myAksCluster", {
    resourceGroupName: resourceGroup.name,
    location: resourceGroup.location,
    properties: {
        // Provisioning properties for AKS
    },
    // Define necessary properties for the AKS cluster, like the node count, VM size, etc.
});

// Step 3: Set up a K8s provider pointing to the AKS cluster.
const k8sProvider = new kubernetes.Provider("k8sProvider", {
    kubeconfig: cluster.kubeConfigRaw,
});

// Step 4: Deploy a Helm chart onto the AKS cluster
const helmChart = new kubernetes.helm.v3.Chart("myHelmChart", {
    chart: "nginx", // Name of your Helm chart. Replace with your chart name.
    version: "1.16.0", // Specify the chart version
    fetchOpts: {
        repo: "https://charts.helm.sh/stable", // Replace with your Helm chart's repository URL.
    },
    // If you have custom values you want to override, specify them here:
    values: {
        // Values to override in the Helm chart.
    },
}, { provider: k8sProvider });

// Export the public IP of the Helm chart service, if applicable.
export const helmChartIp = helmChart.getResourceProperty("v1/Service", "my-nginx-svc", "status")
    .apply(status => status.loadBalancer.ingress[0].ip);
```

In the above program:

- We start by creating a resource group in Azure using `azure_native.resources.ResourceGroup`.
- Then, we provision an AKS cluster within that resource group using `azure_native.hybridcontainerservice.ProvisionedCluster`. We don't specify the provisioning properties in the example; however, you would include your custom configuration here, such as node size, count, location, and any AKS-specific settings.
- We create a `kubernetes.Provider` configured with the `kubeconfig` of our newly created AKS cluster. This provider tells Pulumi how to communicate with our cluster to deploy Kubernetes resources.
- Finally, we deploy a Helm chart named `myHelmChart` using `kubernetes.helm.v3.Chart`. We need to specify the `chart` name, `version`, and `fetchOpts.repo`, which is the Helm repository URL.

Make sure to replace `"nginx"` with the name of your multi-tenant chart, and accordingly adjust the version and other Helm values.

Lastly, we export the public IP address of the service created by the Helm chart if it's a type of LoadBalancer, which allows us to access the deployed application. You'll need to change `"my-nginx-svc"` to the name of your service within your Helm chart.

### Next Steps

1. Install the necessary Pulumi CLI and setup Azure for Pulumi on your local machine.
2. Replace the placeholders (`"nginx"`, Helm chart repo URL, chart version, etc.) with actual values reflecting the specifics of the multi-tenant Helm chart you want to deploy.
3. Run `pulumi up` to preview and deploy your infrastructure.

Please note, the exact details of how you configure your AKS cluster and Helm chart may vary depending on your specific requirements. The above code is a starting point that you'll need to customize for your use case.