Deploy the wireguard-pia helm chart on Azure Kubernetes Service (AKS)

Question

Pulumi · Accepted Answer

To deploy the WireGuard-PIA Helm chart on Azure Kubernetes Service (AKS), we will proceed with the following steps:

1. Provision an AKS cluster using Pulumi with Azure Native Provider.
2. Install the Helm chart onto the AKS cluster.

Here's a detailed explanation along with the Pulumi program written in TypeScript:

### Steps and Code Explanation

#### Step 1: Provisioning an AKS Cluster
We will start by creating an AKS cluster, which requires us to define a resource group and then create the AKS cluster within that group. We will use an existing Virtual Network or create a new one, which is necessary to allocate a subnet for our AKS cluster.

#### Step 2: Deploying the Helm Chart
After the AKS cluster is provisioned, we can deploy the WireGuard-PIA Helm chart. We can do this using Pulumi's `Chart` resource, which is part of Pulumi Kubernetes provider. Pulumi integrates seamlessly with Helm, and this allows us to deploy Helm charts without needing to manually run `helm install` commands.

#### Prerequisites
Ensure you have Pulumi CLI and Azure CLI installed and properly configured to interact with your Azure account.

Now, let's write the Pulumi program:

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

// Step 1: Provision an AKS Cluster

// Create a new resource group to contain the AKS cluster and related resources
const resourceGroup = new azure.resources.ResourceGroup("aksResourceGroup", {
    resourceGroupName: "wireguard-pia-aks-rg",
    location: "EastUS", // Feel free to update this to the Azure region you wish to deploy to
});

// Create an AKS cluster
const aksCluster = new azure.containerservice.ManagedCluster("aksCluster", {
    resourceName: "aksCluster",
    resourceGroupName: resourceGroup.name,
    location: resourceGroup.location,
    agentPoolProfiles: [{
        count: 2, // Set the desired count of nodes in the node pool
        maxPods: 110,
        mode: "System",
        name: "agentpool",
        osType: "Linux",
        vmSize: "Standard_DS2_v2", // Adjust the size as needed
    }],
    dnsPrefix: "wireguard-pia-dns",
    linuxProfile: {
        adminUsername: "azureuser",
        ssh: {
            publicKeys: [{
                keyData: "ssh-rsa ..." // Replace with your SSH public key
            }],
        },
    },
    kubernetesVersion: "1.21.1",
    networkProfile: {
        networkPlugin: "azure",
        serviceCidr: "10.0.0.0/16",
        dnsServiceIP: "10.0.0.10",
        dockerBridgeCidr: "172.17.0.1/16",
    },
    enableRBAC: true,
});

// Export the KubeConfig of the AKS cluster to interact with it
const kubeconfig = pulumi.all([resourceGroup.name, aksCluster.name]).apply(([rgName, clusterName]) =>
    azure.containerservice.listManagedClusterUserCredentials({
        resourceGroupName: rgName,
        resourceName: clusterName,
    }).then(creds => Buffer.from(creds.kubeconfigs[0].value, 'base64').toString())
);
export const kubeConfig = kubeconfig;

// Step 2: Deploying the Helm Chart

const wireguardChart = new k8s.helm.v3.Chart("wireguard-pia-chart", {
    chart: "wireguard-pia", 
    // You might need to specify the repository of the Helm chart if it's not a stable one
    // Example: repo: "https://pia-foss.github.io/helm-charts/"
    values: {}, // Provide any specific configuration here
    fetchOpts: {
        // If required, provide fetch options here (e.g., to specify a version or a repository)
    },
}, { provider: new k8s.Provider("k8s-provider-wireguard", { kubeconfig: kubeconfig }) });

// Exporting the endpoint to access the WireGuard-PIA
export const wireguardEndpoint = aksCluster.fqdn;
```

In this program, we define an AKS cluster with a Linux profile including an SSH public key. We then define a default Kubernetes version and the size of the VMs within the AKS cluster's agent pool.

The `kubeconfig` is then obtained from the created AKS cluster which will allow Pulumi's Kubernetes provider to deploy resources to that cluster.

The Helm chart for WireGuard-PIA is then instantiated with the `k8s.helm.v3.Chart` class from Pulumi's Kubernetes provider. Depending on where the Helm chart is hosted, you may need to alter the `repo` property within the `Chart` resource; if it's not part of the standard Helm repositories, you'll need to specify the custom URL. Additionally, you can provide custom values to the chart via the `values` property.

Lastly, we export the AKS cluster's FQDN so that you can interface with the WireGuard-PIA installation from outside the cluster.

Remember to replace the placeholder values (like your SSH public key) with your actual information before running the program with Pulumi.

To run the program:
- Save the file as `index.ts`.
- Run `pulumi up` in the CLI.
- Confirm the preview looks as you expect and select yes when prompted.

Pulumi will then handle the provisioning of the resources and the deployment of the WireGuard-PIA Helm chart to your AKS cluster.

For more detailed understanding of the steps, you could consult the [Pulumi documentation](https://www.pulumi.com/docs/intro/cloud-providers/azure/).