Deploy the zookeeper-exporter helm chart on Azure Kubernetes Service (AKS)

To deploy the zookeeper-exporter Helm chart on Azure Kubernetes Service (AKS), we need to go through several steps, involving setting up the AKS cluster, configuring the Kubernetes provider to connect to it, and finally deploying the Helm chart.

We will start by creating an AKS cluster using the azure-native Pulumi provider, which is for managing Azure resources with Pulumi. The ProvisionedCluster resource from the azure-native.hybridcontainerservice package will be used to provision the AKS cluster.

Then, we will set up the Pulumi Kubernetes provider to interact with the newly created AKS cluster. This provider allows us to deploy Kubernetes resources, including Helm charts, to our AKS cluster.

Lastly, we'll deploy the zookeeper-exporter Helm chart to the AKS cluster using the Pulumi Kubernetes provider. For this, we'll utilize the Chart resource from the kubernetes Pulumi provider, which manages Helm chart deployments on a Kubernetes cluster.

Here's a Pulumi program written in TypeScript that demonstrates these steps:

import * as pulumi from "@pulumi/pulumi";
import * as azure_native from "@pulumi/azure-native";
import * as k8s from "@pulumi/kubernetes";
import * as azuread from "@pulumi/azuread";
import * as random from "@pulumi/random";

// Create an Azure Resource Group
const resourceGroup = new azure_native.resources.ResourceGroup("myResourceGroup");

// Create an Azure AD service principal for the AKS cluster
const adApp = new azuread.Application("aks");
const adSp = new azuread.ServicePrincipal("aksSp", { applicationId: adApp.applicationId });
const password = new random.RandomPassword("password", {
    length: 20,
    special: true,
}).result;
const adSpPassword = new azuread.ServicePrincipalPassword("aksSpPassword", {
    servicePrincipalId: adSp.id,
    value: password,
    endDate: "2099-01-01T00:00:00Z",
});

// Create the AKS cluster
const aksCluster = new azure_native.containerservice.ManagedCluster("myAksCluster", {
    resourceGroupName: resourceGroup.name,
    agentPoolProfiles: [{
        mode: "System",
        count: 2,
        vmSize: "Standard_DS2_v2",
        osType: "Linux",
        type: "VirtualMachineScaleSets",
    }],
    dnsPrefix: pulumi.interpolate(`${resourceGroup.name}-kube`),
    kubernetesVersion: "1.18.14",
    linuxProfile: {
        adminUsername: "aksuser",
        ssh: {
            publicKeys: [{
                keyData: "ssh-rsa ...",
            }],
        },
    },
    servicePrincipalProfile: {
        clientId: adApp.applicationId,
        secret: adSpPassword.value,
    },
}, { dependsOn: [adApp, adSp, adSpPassword] });

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

// Create a Kubernetes provider instance that uses our cluster's kubeconfig
const k8sProvider = new k8s.Provider("k8sProvider", {
    kubeconfig: kubeconfig,
});

// Deploy the zookeeper-exporter Helm chart
const zookeeperExporterChart = new k8s.helm.v3.Chart("zookeeper-exporter", {
    chart: "zookeeper-exporter",
    version: "1.0.0", // specify the version of the chart
    fetchOpts:{
        repo: "http://myhelmrepo.org/", // specify the Helm repository URL
    },
}, { provider: k8sProvider });

// Export the AKS cluster's kubeconfig
export const kubeconfig = kubeconfig;

In this program:

1. We create an Azure Resource Group to organize our AKS resources.
2. We set up an Azure Active Directory service principal. AKS uses this service principal to interact with other Azure services such as Azure Container Registry.
3. We define a Managed Kubernetes cluster, providing details like the agent pool profiles, DNS prefix, and Kubernetes version.
4. We generate kubeconfig for the AKS cluster, which will allow us to interact with our Kubernetes cluster.
5. We instantiate a Kubernetes provider configured with the kubeconfig of our AKS cluster. This enables Pulumi to deploy resources to our Kubernetes cluster.
6. We then deploy the zookeeper-exporter Helm chart using the Chart resource, providing the chart name and the version, as well as specifying the repository URL where the chart can be found.

Remember to replace the placeholder "ssh-rsa ..." with your actual SSH public key data, and "http://myhelmrepo.org/" with the actual repository URL containing the zookeeper-exporter chart if the chart is not available in the default Helm repositories.

To run this program:

1. Set up Pulumi with Azure credentials. Ensure you are logged in to Azure CLI and have permissions to create resources.
2. Save the code to a file with a .ts extension, for example, deploy-zookeeper-exporter.ts.
3. Run pulumi up in the same directory where your file is located, and Pulumi will perform the deployment.

Ensure you review and understand Azure and Kubernetes pricing information to avoid unexpected charges.