Deploy the pubsub-emulator helm chart on Azure Managed Openshift Service

Question

Pulumi · Accepted Answer

To deploy a Helm chart on an Azure Managed OpenShift service, you'll need to follow these steps:

1. **Set up an Azure Managed OpenShift Cluster**: This cluster will be the Kubernetes environment where your Helm chart will be deployed. You will need to create an OpenShift cluster using Pulumi's `azure-native.containerservice.OpenShiftManagedCluster` resource.

2. **Install the Helm chart**: Once you have a Kubernetes cluster set up, you can deploy Helm charts to it. You'll use the Pulumi `kubernetes` provider and the `Chart` resource to deploy your specific `pubsub-emulator` Helm chart to the OpenShift cluster.

Here is a comprehensive program to achieve this. The program is in TypeScript, and it uses Pulumi to orchestrate the deployment.

**Pre-requisite:** Ensure you have Pulumi installed, and you are logged in to Azure CLI with the right permissions to create resources in your subscription.

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

// Step 1: Create an Azure Managed OpenShift Cluster
const openShiftCluster = new azure_native.containerservice.OpenShiftManagedCluster("myOpenShiftCluster", {
    // Update with your own values
    resourceGroupName: "myResourceGroup",
    location: "East US", // choose an appropriate Azure location here
    openShiftVersion: "4.3", // specify your desired OpenShift version
    agentPoolProfiles: [{
        name: "agentpool",
        count: 3, // the number of worker nodes
        vmSize: "Standard_DS2_v2", // VM size for your worker nodes
        role: "compute", // the role for the agent pool
    }],
    /* Replace the network profile as needed to fit within your VNET
    example:
    networkProfile: {
      vnetId: "/subscriptions/.../resourceGroups/myResourceGroup/providers/Microsoft.Network/virtualNetworks/myVNET",
      peerVnetId: "...",
      // Define your CIDR as needed
    },
    */
    masterPoolProfile: {
        name: "masterpool",
        count: 3, // number of master nodes, pick according to your redundancy needs
        vmSize: "Standard_DS2_v2", // VM size for your master nodes
    },
    // Define authentication profiles, DNS configuration etc., as necessary.
});

// Step 2: Deploy the Helm chart of pubsub-emulator on OpenShift
// Before this step make sure that Helm is installed on your machine, and the pubsub-emulator chart is available for installation.
// You might need to add the Helm chart repository that contains the pubsub-emulator.
const pubsubEmulatorChart = new k8s.helm.v3.Chart("pubsub-emulator-chart", {
    // Chart repository URL where `pubsub-emulator` is located or could be a a local path.
    chart: "pubsub-emulator",
    // Kubernetes namespace where the chart should be deployed. Defaults to `default` if not specified.
    namespace: "default",
    // Values to pass to the chart for customization. Example: { key: "value" }
    values: {},
    // Specify which cluster to deploy to, using the kubeconfig provided by Azure.
    // In this case we get the kubeconfig from the created OpenShift Cluster.
    // Note: this step assumes that the cluster's `.kubeconfig` is exposed correctly.
    // If required, fetch the kubeconfig from Azure CLI or Azure portal and supply it here.
    fetchOpts: {
        repo: "http://<YOUR_HELM_REPO_URL>",
    },
}, { provider: new k8s.Provider("k8s-provider", { kubeconfig: "CONTENT_OF_YOUR_KUBECONFIG" }) });

// Export the kubeconfig of the cluster and the public hostname of the pubsub emulator app.
export const kubeconfig = pulumi.secret(openShiftCluster.kubeConfigRaw);
export const pubsubEmulatorHostname = pubsubEmulatorChart.getResourceProperty('v1/Service', 'pubsub-emulator-service', 'status').apply(status => status.loadBalancer.ingress[0].hostname);
```

Here's what the program does:
- **Initializes the OpenShift Cluster**: This sets up the managed OpenShift cluster by specifying the name, location, version, profile for agent and master pool and other necessary configurations.
  
- **Deploys the Helm Chart**: It sets up the pubsub-emulator Helm chart by specifying the namespace and values.

Remember the following:
- Replace placeholders like `"myResourceGroup"`, `"East US"`, `"4.3"` with your Azure resource group, preferred location, desired OpenShift version, and network configurations for the cluster.
- Ensure you have access to the pubsub-emulator Helm chart and know the repository URL where it is located.
- In the `Chart` resource, customize the `namespace` or any values (`values: {}`) as required by the pubsub-emulator Helm chart.
- You will