Deploy the hivemq-platform helm chart on Azure Kubernetes Service (AKS)

Question

Pulumi · Accepted Answer

In order to deploy the `hivemq-platform` Helm chart on Azure Kubernetes Service (AKS), you'll need to accomplish a few steps:

1. Create an AKS cluster: This is the environment where your Kubernetes resources will live. You'll need to specify the version of Kubernetes you want to run, as well as node size and count.
   
2. Install the Helm chart: Helm is a package manager for Kubernetes that allows you to define, install, and upgrade even the most complex Kubernetes applications.

Here is a Pulumi program written in TypeScript that demonstrates how to create an AKS cluster and deploy a Helm chart to it:

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

// Create an Azure resource group
const resourceGroup = new azure.core.ResourceGroup("resourceGroup", {
    location: "East US",
});

// Create an AKS cluster
const cluster = new azure.containerservice.KubernetesCluster("aksCluster", {
    resourceGroupName: resourceGroup.name,
    agentPoolProfiles: [{
        count: 2,
        vmSize: "Standard_D2_v2",
    }],
    dnsPrefix: `${pulumi.getStack()}-kube`,
    // Ensure that the latest Kubernetes version is used
    kubernetesVersion: azure.containerservice.getLatestKubernetesVersion({
        location: resourceGroup.location,
    }).then(version => version.latestVersion),
    // Default Node Pool settings including availability to use Virtual Machine Scale Sets and one node
    // This default node pool is named "agentpool"
    defaultNodePool: {
        name: "agentpool",
        nodeCount: 1,
        vmSize: "Standard_DS2_v2",
        enableAutoScaling: true,
        minCount: 1,
        maxCount: 3,
    },
    identity: {
        type: "SystemAssigned",
    },
});

// Export the Kubeconfig
const exportedKubeConfig = pulumi.
    all([cluster.name, resourceGroup.name]).
    apply(([clusterName, rgName]) => {
        return azure.containerservice.listManagedClusterUserCredentials({
            resourceGroupName: rgName,
            resourceName: clusterName,
        });
    }).
    apply(creds => creds.kubeconfigs[0].value).
    apply(enc => Buffer.from(enc, 'base64').toString());

// Create a provider for the Kubernetes cluster
const k8sProvider = new k8s.Provider("k8sProvider", {
    kubeconfig: exportedKubeConfig,
});

// Deploy the hivemq-platform helm chart
const hivemqChart = new k8s.helm.v3.Chart("hivemq-platform", {
    chart: "hivemq-platform",
    version: "4.7.0", // Replace with actual chart version
    fetchOpts: {
        repo: "https://www.hivemq.com/helm/", // Replace with the actual repo URL for hivemq helm charts
    },
}, { provider: k8sProvider });

// Export the cluster's kubeconfig
export const kubeConfig = exportedKubeConfig;
```

### Detailed Explanation

- **Resource Group**: In Azure, a resource group is a container that holds related resources for an Azure solution. The `ResourceGroup` resource provides a way to deploy and manage a set of resources as a unit.

- **AKS Cluster**: This is a managed Kubernetes service that simplifies deploying, managing, and operating Kubernetes clusters in Azure. The `KubernetesCluster` resource specifies the details of your cluster, such as the node size and the count of nodes.

- **Kubeconfig Export**: After the AKS cluster is created, we need to retrieve the `kubeconfig` file that will allow us to interact with our Kubernetes cluster using tools like `kubectl` or the Kubernetes client library.

- **Kubernetes Provider**: The `k8s.Provider` resource uses the exported `kubeconfig` to create a Pulumi Kubernetes provider that knows how to communicate with your AKS cluster.

- **Helm Chart**: Finally, we deploy the `hivemq-platform` Helm chart using `Chart` resource from Pulumi's Kubernetes package. You may need to change the `version` and `repo` parameters to match the version of the chart you intend to deploy.

### What Happens When You Run This Program

1. Pulumi will reach out to Azure and create the resources defined in the program.
2. It will create a Kubernetes cluster in AKS.
3. The program will obtain the kubeconfig for the newly created AKS cluster.
4. Using this kubeconfig, Pulumi will deploy the `hivemq-platform` Helm chart to your AKS cluster.

Once the Pulumi program is finished running, you'll have a running instance of `hivemq-platform` on your AKS cluster. You can use the `kubectl` command-line tool to interact with your Kubernetes resources or any other compatible Kubernetes management tool.