Deploy the ztncui helm chart on Azure Managed Openshift Service

Question

Pulumi · Accepted Answer

To deploy the `ztncui` Helm chart on Azure Managed OpenShift Service, we'll go through the following steps:

1. Create an Azure Managed OpenShift cluster using the `azure-native.containerservice.OpenShiftManagedCluster` resource.
2. Install the Helm chart on the OpenShift cluster using the `kubernetes.helm.sh/v3.Chart` resource.

Let's break down the process step by step.

### Step 1: Create an Azure Managed OpenShift Cluster

Firstly, we need to provision an OpenShift cluster in Azure. We will use the Pulumi `azure-native` provider, which interacts with Azure resources in a native way. Specifically, we will use the `azure-native.containerservice.OpenShiftManagedCluster` resource to create an OpenShift Managed Cluster. The OpenShift cluster provides a Kubernetes-compatible environment with additional enterprise security and features.

For this, you need to define certain mandatory parameters such as the location of the resources and the version of OpenShift. You'd also need to define the `agentPoolProfiles` which determines the size, type, and number of nodes for your cluster. The agent pools are VMs that run your applications and services.

### Step 2: Deploy the Helm Chart

Once the cluster is up and running, you can deploy applications using Helm charts. Helm helps you manage Kubernetes applications — Helm Charts help you define, install, and upgrade even the most complex Kubernetes application.

In Pulumi, we use the `kubernetes.helm.sh/v3.Chart` resource to deploy a Helm chart onto the Kubernetes cluster. The resource properties will typically include the `repo`, `chart`, `version`, and `values`, where `values` are used to provide configuration to the Helm chart.

Here is the Pulumi program in TypeScript that demonstrates how to deploy the `ztncui` Helm chart on an Azure Managed OpenShift cluster.

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

// Step 1: Create an Azure Managed OpenShift Cluster
const managedCluster = new azureNative.containerservice.OpenShiftManagedCluster("myOpenShiftCluster", {
    // Required properties
    location: "West US", // specify the location here
    openShiftVersion: "4.3", // specify the OpenShift version here
    resourceGroupName: "myResourceGroup", // specify your resource group name here
    resourceName: "myCluster",
    
    // Specify the profile for the cluster service principal or identity
    // For example purposes, the clientId and secret are hardcoded, you might fetch these from config or a secret store
    servicePrincipalProfile: {
        clientId: "yourServicePrincipalClientId",
        secret: "yourServicePrincipalSecret",
    },

// Define agent pool profile using an array
    agentPoolProfiles: [{
        name: "agentpool",
        count: 3,
        vmSize: "Standard_DS2_v2",
        role: "compute",
        osType: "Linux",
    }],
    
    // Other properties can be set as needed
});

// Step 2: Deploy the ztncui Helm chart to the Azure Managed OpenShift Cluster
const ztncuiChart = new kubernetes.helm.v3.Chart("ztncui", {
    // Helm chart repository options
    fetchOpts: {
        repo: "https://helm-repo-url/", // Replace with the actual Helm repo URL for ztncui
    },

// Specify the Helm chart and version
    chart: "ztncui",
    version: "chart-version", // Replace with the actual Helm chart version for ztncui

// Provide an empty object if no values are needed; otherwise, populate with configuration values
    values: {},

// Reference the OpenShift cluster created earlier
    // Make sure to configure the Kubernetes provider to interact with the created OpenShift cluster
}, { provider: new kubernetes.Provider("k8sProvider", { 
    kubeconfig: managedCluster.kubeconfig.apply(JSON.stringify) 
})});

// Export the Kubernetes provider kubeconfig and the cluster endpoint
export const kubeconfig = managedCluster.kubeconfig;
export const clusterEndpoint = managedCluster.clusterEndpoint;
```

**Explanation:**
- The `azureNative.containerservice.OpenShiftManagedCluster` defines the Azure Managed OpenShift cluster with specific configurations like location, version, resource group, and agent pool profiles.
- The `kubernetes.helm.sh/v3.Chart` resource is used to install the `ztncui` Helm chart into the OpenShift cluster.
- The `kubeconfig` and `clusterEndpoint` are exported to allow you to interact with the cluster using kubectl after the deployment.
- You should replace placeholder strings like `yourServicePrincipalClientId` and `chart-version` with actual values specific to your scenario.
- Ensure that you have the correct Helm repo URL for the `ztncui` chart.

Keep in mind that it's crucial to secure your service principal credentials and not to expose them in your code. You would use Pulumi secrets or environmental variables in practice, but for the purpose of this illustration, they are included as placeholders.

After running this Pulumi program, it will provision an Azure Managed OpenShift service and deploy the `ztncui` Helm chart onto it. The resulting infrastructure will include an OpenShift Kubernetes cluster with the `ztncui` application running inside.