Deploy the terracotta helm chart on Azure Managed Openshift Service

Question

Pulumi · Accepted Answer

To deploy the Terracotta helm chart on Azure Managed OpenShift Service, you need to perform the following high-level steps:

1. **Set up an Azure Red Hat OpenShift (ARO) cluster**: Start by deploying an ARO cluster which Azure provides as a managed service. ARO combines the innovation of enterprise Kubernetes with the world’s leading enterprise Linux platform, Red Hat Enterprise Linux, managed by Microsoft and Red Hat.

2. **Install and configure Pulumi & Azure CLI**: Ensure you have Pulumi CLI and Azure CLI tools installed on your machine and logged in to your Azure Account.

3. **Create a Pulumi project**: Initialize a new Pulumi project using your preferred language. We will use TypeScript for this example.

4. **Deploy the ARO cluster using Pulumi**: Write a Pulumi program to create the necessary Azure resources, including the ARO cluster.

5. **Set up an Azure Container Registry (ACR) if needed**: You can store container images in the ACR, which will be used to pull images when you install the Helm chart.

6. **Install Helm on your local machine**: Helm is a package manager for Kubernetes, which you’ll use to install the Terracotta helm chart.

7. **Deploy Terracotta using Pulumi’s Kubernetes provider**: We will use the `kubernetes.helm.v3.Chart` resource from the Pulumi Kubernetes provider to deploy the Terracotta helm chart to the ARO cluster.

Here is a Pulumi program written in TypeScript that demonstrates these steps:

```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 Red Hat OpenShift cluster.
// This example assumes that you've already set up a resource group and necessary resources like Virtual Network.
const openShiftCluster = new azure_native.redhatopenshift.OpenShiftCluster("myOpenShiftCluster", {
  // Replace these values with your specific configuration
  resourceGroupName: "myResourceGroup",
  resourceName: "myClusterName",
  location: "East US",
  masterProfile: {
    vmSize: "Standard_D8s_v3"
  },
  workerProfiles: [
    {
      name: "worker", // Worker profile name
      count: 3,       // Number of nodes
      vmSize: "Standard_D4s_v3",
    },
  ],
  // ... Additional configurations for networking, apiserverProfile, etc.
});

// Step 2: Set up the Kubernetes provider to connect to the OpenShift cluster.
// The assumption here is that the necessary kubeconfig is ready and configured to connect to the ARO cluster.
const clusterProvider = new k8s.Provider("openshiftK8sProvider", {
  kubeconfig: openShiftCluster.kubeconfig,
});

// Step 3: Deploy the Terracotta helm chart to ARO cluster using the Pulumi Kubernetes provider.
const terracottaHelmChart = new k8s.helm.v3.Chart("terracotta", {
  repo: "myHelmCharts",   // The repository where the Terracotta Helm Chart is hosted
  chart: "terracotta",    // The name of the chart in the repository
  version: "1.0.0",       // The version of the chart to deploy
  // You can specify the values file or any overrides here,
  values: {
    // ... values to override in the Terracotta Helm Chart
  },
}, { provider: clusterProvider });

// Export the URL to access Terracotta.
export const terracottaUrl = pulumi.interpolate`http://${terracottaHelmChart.getResourceProperty("v1/Service", "terracotta", "status").loadBalancer.ingress[0].ip}`;

```

**Explanation:**
- In the example above, we define an Azure Managed OpenShift cluster using Pulumi's `azure_native.redhatopenshift.OpenShiftCluster` resource.
- After setting up the ARO cluster, we create an instance of `k8s.Provider` which allows Pulumi to connect to and manage Kubernetes resources within the ARO cluster.
- We then define a Helm chart resource using Pulumi's Kubernetes provider, which deploys the Terracotta helm chart to our ARO cluster.
- Finally, we export a URL that would allow access to the Terracotta application, assuming that it creates a `LoadBalancer` service. You will need to adjust this based on your actual service configuration.

**Please Note**:
- The code is set up with example values for illustration purposes. You must replace `"myResourceGroup"`, `"myClusterName"`, and other placeholder values with your actual configurations.
- The URL for the helm chart (`myHelmCharts`) and the version (`1.0.0`) should also be replaced with the actual chart repository details where Terracotta is hosted.
- The `values` field within the Helm chart definition is where you can place your configuration overrides for the Terracotta helm chart. You would replace this with the actual values you need for your deployment.
- This code also assumes that you have set up a variable or config value for `kubeconfig` that will allow the Kubernetes provider to authenticate with your ARO cluster.

Before running this code, your environment must be properly configured to interact with Microsoft Azure and have necessary components installed, such as the `az` CLI tool, `kubectl`, `helm`, and `pulumi` CLI tools. Ensure all these are installed and configured before attempting to deploy this program.