Deploy the nfs-provisioner helm chart on Azure Kubernetes Service (AKS)

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Pulumi · Accepted Answer

To deploy the nfs-provisioner Helm chart on Azure Kubernetes Service (AKS), we will perform the following steps:

1. Set up an AKS cluster using Pulumi's `azure-native` provider.
2. Deploy the nfs-provisioner Helm chart to the cluster.

Firstly, to establish our AKS cluster, we will use the `azure-native` provider's [`ProvisionedCluster`](https://www.pulumi.com/registry/packages/azure-native/api-docs/hybridcontainerservice/provisionedcluster/) resource. This will create a new managed Kubernetes cluster in Azure, which we can subsequently configure with the necessary node pools and settings.

Next, we will install the nfs-provisioner Helm chart. Helm is a package manager for Kubernetes that allows us to define, install, and upgrade complex Kubernetes applications. nfs-provisioner is an open-source project that can provision persistent volumes on an existing cluster.

To deploy a Helm chart, we can use the Pulumi Kubernetes provider's [`Chart`](https://www.pulumi.com/registry/packages/kubernetes/api-docs/helm.sh/v3/chart/) resource, which allows deploying Helm charts into a Kubernetes cluster.

Here's how we can write our Pulumi TypeScript program:

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

// Create a resource group for our AKS Cluster
const resourceGroup = new azure_native.resources.ResourceGroup("aksResourceGroup");

// Create an AKS cluster.
const aksCluster = new azure_native.containerservice.ManagedCluster("aksCluster", {
    resourceGroupName: resourceGroup.name,
    agentPoolProfiles: [{
        count: 2,
        maxPods: 110,
        mode: "System",
        name: "agentpool",
        osDiskSizeGB: 30,
        osType: "Linux",
        vmSize: "Standard_DS2_v2",
    }],
    dnsPrefix: pulumi.interpolate`${resourceGroup.name}-kube`,
    enableRBAC: true,
    kubernetesVersion: "1.18.14",
    linuxProfile: {
        adminUsername: "testuser",
        ssh: {
            publicKeys: [{
                keyData: sshPublicKey, // Replace with your SSH public key.
            }],
        },
    },
    nodeResourceGroup: `MC_azure-native-go_${aksCluster.name}`,
    identity: {
        type: "SystemAssigned"
    },
});

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

// Using the resulting kubeconfig from the cluster, we initialize a Kubernetes provider instance.
const k8sProvider = new k8s.Provider("k8sProvider", {
    kubeconfig: kubeconfig,
});

// Generate a random string for the Helm release name to avoid conflicts.
const releaseName = new random.RandomString("releaseName", {
    length: 10,
    special: false,
    upper: false,
}).result;

// Deploy the nfs-provisioner Helm chart into our AKS cluster.
const nfsProvisioner = new k8s.helm.v3.Chart("nfs-provisioner", {
    chart: "nfs-server-provisioner",
    version: "1.0.0", // Use the correct version number for nfs-provisioner
    fetchOpts: {
        repo: "https://kubernetes-sigs.github.io/nfs-subdir-external-provisioner/",
    },
}, { provider: k8sProvider });

// Export the Helm release name.
export const helmReleaseName = releaseName;
```

In this program, we are doing the following:

- We start by creating an instance of `ResourceGroup` to organize the resources related to our AKS cluster.
- We then define an AKS cluster with `ManagedCluster`, specifying the desired node count, disk size, VM size, and Kubernetes version.
- We export the kubeconfig for the cluster, which contains the configuration information needed to connect and manage the Kubernetes cluster.
- To interact with our Kubernetes cluster, we create a new instance of the `k8s.Provider` which uses the exported kubeconfig.
- We also generate a random string for the nfs-provisioner Helm chart release to prevent potential conflicts with other releases.
- Using the `Chart` resource, we deploy the nfs-provisioner Helm chart to our Kubernetes cluster within the given namespace (you may need to adjust the version and repo according to the nfs-provisioner chart you want to use).

Note that you need to replace the `sshPublicKey` placeholder with your actual SSH public key string to provision the Linux profile for AKS nodes.

Also, ensure that you have the appropriate permissions and have logged in with the Azure CLI tool before executing this script through Pulumi. After you deploy this script with Pulumi, the nfs-provisioner will be set up in your AKS cluster, and you can start using it to provision persistent volumes for your applications.