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

Question

Pulumi · Accepted Answer

To deploy the IPsec Helm chart on Azure Kubernetes Service (AKS), we'll create a Pulumi program in TypeScript. This program will consist of a few steps:

1. **Create an AKS cluster**: We need an AKS cluster where our IPsec application will run. We'll define an AKS cluster resource using Pulumi.
   
2. **Deploy the Helm chart**: Once we have the AKS cluster, we'll use Pulumi's Helm Chart resource to deploy IPsec to it.

Here's a detailed plan of what each part of the Pulumi program does:

- **Azure Kubernetes Service (AKS)**: We'll set up a Kubernetes cluster on Azure using the `ProvisionedCluster` resource from the `azure-native` package. This resource allows provisioning an AKS cluster with a specification that includes node size, the number of nodes, and other configurations.

- **Helm Chart**: We'll use Pulumi's `Chart` resource from the `kubernetes` package to deploy the IPsec Helm chart. This resource accepts the name of the chart and other optional parameters like values overrides, which you can use to customize your Helm chart deployment.

Let's get started with the Pulumi TypeScript program that accomplishes these steps. Make sure you have Pulumi and necessary providers installed, and you are authenticated with Azure where you plan to deploy the AKS cluster and the IPsec application.

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

// Step 1: Create an AKS cluster
const resourceGroup = new azure.resources.ResourceGroup("aksResourceGroup");

const aksCluster = new azure.containerservice.ManagedCluster("aksCluster", {
    resourceGroupName: resourceGroup.name,
    agentPoolProfiles: [{
        count: 2,
        maxPods: 110,
        mode: "System",
        name: "agentpool",
        osType: "Linux",
        vmSize: "Standard_DS2_v2",
    }],
    dnsPrefix: `${pulumi.getStack()}-kube`,
    enableRBAC: true,
    kubernetesVersion: "1.18.14",
    linuxProfile: {
        adminUsername: "adminuser",
        ssh: {
            publicKeys: [{
                keyData: "ssh-rsa ...", // replace with your SSH public key
            }],
        },
    },
    nodeResourceGroup: `MC_azure-${pulumi.getStack()}_aksCluster_${resourceGroup.location}`,
    resourceGroupName: resourceGroup.name,
    servicePrincipalProfile: {
        clientId: "INSERT_SP_APP_ID", // replace with your Service Principal App ID
        secret: "INSERT_SP_SECRET", // replace with your Service Principal Secret
    },
});

// Step 2: Deploy the Helm chart
const k8sProvider = new kubernetes.Provider("k8sProvider", {
    kubeconfig: aksCluster.kubeConfigRaw,
});

const chart = new kubernetes.helm.v3.Chart("ipsecChart", {
    chart: "ipsec",
    // As an example, we specify the version to a hypothetical "1.2.3"
    version: "1.2.3",
    // Replace below with the Helm repo where your IPsec chart is located
    fetchOpts: {
        repo: "https://charts.example.com/",
    },
}, { provider: k8sProvider });

export const aksClusterName = aksCluster.name;
export const kubeconfig = aksCluster.kubeConfigRaw;
```

In this program:

- We start by creating a new resource group for our AKS resources.
- We then provision a new AKS cluster with two nodes (`agentPoolProfiles.count: 2`), specifying the size of the VMs and enabling RBAC for security.
- The `kubernetesVersion` is set, but you would typically use the latest supported version.
- Service Principal credentials are used to create the AKS cluster. You need to replace `INSERT_SP_APP_ID` and `INSERT_SP_SECRET` with your actual Service Principal Application ID and Secret.
- For SSH access to the nodes, we specify an SSH public key.
- Once the AKS cluster is created, we instantiate a Pulumi Kubernetes provider pointing to our new AKS cluster using its `kubeConfigRaw`.
- We deploy the IPsec helm chart to the cluster. You need to replace the `chart` version and `repo` with the actual Helm chart you want to use.
- The program exports the name of the AKS cluster and the raw Kubernetes config, which can be used to access the Kubernetes cluster via `kubectl`.

After writing this code, save this into a `.ts` file, and use the Pulumi CLI to create a new stack and update it. During the update, Pulumi will provision the AKS cluster and deploy your Helm chart automatically.

Please ensure that you have replaced the placeholders with actual values before running Pulumi commands to deploy this stack, such as your SSH public key and your Service Principal credentials.