Deploy the tyk-gateway helm chart on Azure Kubernetes Service (AKS)

Question

Pulumi · Accepted Answer

To deploy the Tyk Gateway helm chart on Azure Kubernetes Service (AKS), you will need to accomplish the following:

1. Set up an AKS cluster on Azure.
2. Install Pulumi's `kubernetes` and `azure-native` SDKs.
3. Initialize Helm and install the Tyk Gateway Helm chart onto the AKS cluster.

Below is a step-by-step guide to create a program that will deploy the Tyk Gateway on AKS using Pulumi with TypeScript.

### Prerequisites
Before you begin, make sure you have the following prerequisites installed:
- [Pulumi CLI](https://www.pulumi.com/docs/get-started/install/)
- [Azure CLI](https://docs.microsoft.com/en-us/cli/azure/install-azure-cli)
- [Node.js](https://nodejs.org/en/download/)
- An Azure account with the necessary permissions to create resources.

### Step 1: Create a new Pulumi project
Start by creating a new Pulumi project. Run the following command and follow the prompts:
```
pulumi new azure-typescript
```

### Step 2: Define AKS Cluster
In your Pulumi program, you will define an AKS cluster using the `azure-native` package.

### Step 3: Define Helm Chart
You will then declare the Tyk Gateway Helm chart using Pulumi's Kubernetes package.

Now, let's write the code for these steps.

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

// Step 1: Create an AKS cluster
// ResourceGroup is needed to group all the resources in Azure.
const resourceGroup = new azure.resources.ResourceGroup("resourceGroup");

// Actual definition of the AKS cluster.
const aksCluster = new azure.containerservice.ManagedCluster("aksCluster", {
    resourceGroupName: resourceGroup.name,
    agentPoolProfiles: [{
        count: 1,
        vmSize: "Standard_DS2_v2",
        name: "agentpool",
        mode: "System",
    }],
    dnsPrefix: pulumi.interpolate`${pulumi.getStack()}-kube`,
    identity: {
        type: "SystemAssigned",
    },
});

// Step 2: Obtain the kubeconfig from the AKS cluster
const creds = pulumi.all([resourceGroup.name, aksCluster.name]).apply(([rgName, clusterName]) =>
    azure.containerservice.listManagedClusterUserCredentials({
        resourceGroupName: rgName,
        resourceName: clusterName,
    }),
);

const kubeconfig = creds.apply(creds => Buffer.from(creds.kubeconfigs[0].value, "base64").toString());

// Step 3: Initialize Kubernetes provider using obtained kubeconfig
const k8sProvider = new k8s.Provider("k8sProvider", {
    kubeconfig: kubeconfig,
});

// Step 4: Deploy the Tyk Gateway helm chart
// Define the helm chart and the values
const tykGatewayChart = new k8s.helm.v3.Chart("tyk-gateway", {
    chart: "tyk-headless",
    version: "1.9.1",
    fetchOpts:{
        repo: "https://helm.tyk.io/public/helm/charts/",
    },
    values: {
        // Define the necessary values here
        gateway: {
            // Example value, adjust as needed
            replicaCount: 1,
        },
    },
}, { provider: k8sProvider });

// Export the kubeconfig to access the cluster with kubectl
export const kubeConfig = kubeconfig;
```

This Pulumi program performs several key actions:

- It creates a new resource group in Azure to group the resources.
- It sets up an AKS cluster with a single node in a pool.
- It retrieves the kubeconfig file necessary to interact with the cluster.
- It establishes a Pulumi Kubernetes provider with that kubeconfig.
- It defines and installs the Tyk Gateway using its Helm chart.

### Next steps after running the program:
To apply the Pulumi program, run `pulumi up` in your console. The Pulumi CLI will then preview the changes and ask for your confirmation to proceed with the deployment.

Please note that you should consult the official [Tyk Helm chart documentation](https://tyk.io/docs/tyk-stack/tyk-gateway/installation/) for the specific values you might need to include in the `values` section of the Helm chart configuration. The example provided here is a basic setup, and for a production deployment, you might need to provide additional settings.