Deploy the tyk-stack helm chart on Azure Managed Openshift Service

Question

Pulumi · Accepted Answer

To deploy the tyk-stack Helm chart on Azure Managed OpenShift Service using Pulumi, you need to follow several steps:

1. Set up an Azure Red Hat OpenShift cluster using the `Azure Native` provider in Pulumi.
2. Deploy the tyk-stack Helm chart onto the OpenShift cluster using the `Kubernetes` provider's `Chart` resource from Pulumi.

Before you begin, make sure you have the Pulumi CLI installed and configured for use with your Azure account. Additionally, you should have `kubectl` configured to communicate with your Azure Kubernetes Service (AKS) if needed.

First, let's set up the OpenShift cluster on Azure. We'll use the `azure-native.redhatopenshift.OpenShiftCluster` resource to create the cluster. The specific parameters needed for your OpenShift cluster can vary, so you'll want to adjust the following program to fit your requirements, such as specifying the correct location, resource group, OpenShift version, and other properties based on your use case.

After setting up the OpenShift cluster, we'll deploy the tyk-stack Helm chart. For that, we will use Pulumi's support for Helm charts with the `kubernetes.helm.v3.Chart` resource, which is a part of the Kubernetes provider in Pulumi. This resource allows us to install, upgrade, and manage Helm charts.

Let’s dive into the code:

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

// Create an Azure resource group
const resourceGroup = new azure_native.resources.ResourceGroup("resourceGroup", {
    resourceGroupName: "openShiftResourceGroup",
    location: "East US",
});

// Create an Azure Red Hat OpenShift cluster
const cluster = new azure_native.redhatopenshift.OpenShiftCluster("myOpenShiftCluster", {
    resourceGroupName: resourceGroup.name,
    resourceName: "myOpenShiftCluster",
    location: resourceGroup.location,
    clusterProfile: {
        pullSecret: "<pullSecret>", // Replace with your pull secret
        domain: "example.com",      // Choose a domain name
        version: "4.6.9",           // Specify the OpenShift version
    },
    masterProfile: {
        vmSize: "Standard_D8s_v3", // Choose an appropriate VM size
    },
    networkProfile: {
        podCidr: "10.128.0.0/14",    // Define the Pod CIDR block
        serviceCidr: "172.30.0.0/16", // Define the Service CIDR block
    },
    // Additional required configurations...
});

// Once the OpenShift cluster is created, we want to configure k8s provider to deploy resources into it
const k8sProvider = new k8s.Provider("k8sProvider", {
    kubeconfig: cluster.kubeadminPassword.apply(password => {
        // Here you would construct a valid kubeconfig file string based on the cluster properties,
        // including API server URL and the kubeadmin password. You may need to use `cluster.apiServerUrl`.
        return `apiVersion: v1
clusters:
- cluster:
    server: ${cluster.apiServerUrl}
    // Add any required certificates here
  name: openshift
contexts:
- context:
    cluster: openshift
    user: kubeadmin
  name: default-context
current-context: default-context
kind: Config
preferences: {}
users:
- name: kubeadmin
  user:
    token: ${password}`;
    }),
    // You may need to specify additional properties such as `clusterCaCertificate` for TLS verification.
});

// Deploy the tyk-stack Helm chart
const tykStack = new k8s.helm.v3.Chart("tyk-stack", {
    chart: "tyk-headless",                          // The name of the chart
    version: "0.9.3",                               // Specify the version of the chart
    fetchOpts: { repo: "https://helm.tyk.io/public" }, // The repository of the tyk-stack Helm chart
}, { provider: k8sProvider });

// Export the OpenShift cluster's API server URL
export const openShiftApiServerUrl = cluster.apiServerUrl;
```

In this TypeScript program for Pulumi, we begin by importing the necessary packages from Pulumi's registry for both Azure and Kubernetes resources. The `resourceGroup` holds all the resources we create, including the cluster. We then describe the OpenShift cluster we want to provision.

After the cluster is created, we set up a Kubernetes provider that uses the cluster's kubeconfig to manage Kubernetes resources. We construct the kubeconfig string dynamically based on the properties of the OpenShift cluster.

Lastly, we declare a new instance of the `Chart` resource, which represents the tyk-stack Helm chart. We give it a name, the chart's name, the version to use, and the Helm repository where it can be found. The provider tells Pulumi which Kubernetes cluster to deploy the chart to.

To finish, we export the API server URL so you can access your OpenShift cluster with `kubectl` or other tools.

Now, let's talk about how to run this program:

- Save the code in a TypeScript (.ts) file and ensure it's part of a Pulumi project.
- Run `pulumi up` from your command line in the directory where you saved this code.
- Pulumi will show you a preview of the resources to create. If everything looks correct, confirm the deployment.

Remember, this is a high-level overview of the process; exact resource definitions and configurations will depend on your specific needs and may require additional setup. Make sure all sensitive data like `pullSecret` are kept secure and are not hardcoded in your Pulumi program. Use Pulumi's secret management or environment variables if necessary.