Deploy the postgres-instance helm chart on Azure Managed Openshift Service

Question

Pulumi · Accepted Answer

To deploy a `postgres-instance` Helm chart on an Azure Managed OpenShift Service using Pulumi, you need to take several steps:

1. **Set up an Azure Managed OpenShift Cluster**: This is your Kubernetes-compatible environment where the application will run. We will use the `azure-native.containerservice.OpenShiftManagedCluster` class to create this.

2. **Install the Helm Chart**: After setting up the OpenShift cluster, you'll use the `kubernetes.helm.v3.Chart` class from Pulumi's Kubernetes provider to deploy the `postgres-instance` chart.

Here's how you could write your Pulumi program in TypeScript to accomplish this:

### Step-by-step breakdown:

**1. Set up an OpenShift Managed Cluster:**

First, import the necessary Pulumi libraries and then declare your OpenShift cluster. Note that a real deployment would require you to have proper SSH keys, a domain, and other mandatory configuration settings in place, which are represented here as placeholders for the purposes of this example.

**2. Deploy the Helm Chart:**

With the cluster set up, next instantiate a Helm chart resource that points to the `postgres-instance` chart. You'll specify the repository (if it's a custom one), the chart name, and any values that need to be overridden in the `values` parameter.

### 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("myResourceGroup");

// Create an Azure Managed OpenShift cluster
const cluster = new azure_native.containerservice.OpenShiftManagedCluster("myOpenShiftCluster", {
    /* Replace the below properties with actual values */
    // resourceName: "myOpenShiftCluster",
    // resourceGroupName: resourceGroup.name,
    location: "East US",  // Be sure to choose a location that supports OpenShift
    openShiftVersion: "4.3", // Use a supported OpenShift version
    networkProfile: {
        vnetCidr: "10.0.0.0/8",
    },
    masterPoolProfile: {
        count: 3, // Number of masters
        vmSize: "Standard_D4s_v3" // Size of the VM instances
    },
    // Other required configurations...
    // This example is simplified, more configuration will be needed in a real-world scenario
    // See the documentation: https://www.pulumi.com/registry/packages/azure-native/api-docs/containerservice/openshiftmanagedcluster/
});

// Create a provider for the above OpenShift cluster
const k8sProvider = new k8s.Provider("k8sProvider", {
    kubeconfig: cluster.kubeconfigRaw, // kubeconfig is obtained from the OpenShift Managed Cluster
});

// Deploy a postgres-instance Helm chart
const postgresChart = new k8s.helm.v3.Chart("postgres-instance", {
    chart: "postgresql",
    version: "9.1.1", // Use the version of the chart you want to deploy
    fetchOpts: { repo: "https://charts.bitnami.com/bitnami" }, // Specify the Helm chart repository here, if it's not a default one
    // values: { /* Custom values for PostgreSQL */ },
}, { provider: k8sProvider }); // Specify the provider to ensure Helm uses the correct cluster

// Export the kubeconfig to access the cluster
export const kubeconfig = cluster.kubeconfigRaw;

// When running `pulumi up`, Pulumi will do the following:
// 1. Provision an Azure Managed OpenShift Service cluster
// 2. Set up a Kubernetes provider associated with the new cluster
// 3. Use the Kubernetes provider to install a postgres-instance Helm chart to the cluster
```

### Explanation:

The above program does the following:

- It starts by creating a new resource group in Azure to contain all resources.
- Next, it provisions a new Azure Managed OpenShift cluster with necessary parameters like location, OpenShift version, network profile, and master pool profile.
- The `kubeconfig` for managing the Kubernetes resources within the OpenShift cluster is then obtained from the cluster resource itself.
- A Kubernetes provider is then set up using this `kubeconfig` which allows Pulumi to communicate with your OpenShift cluster.
- Using this provider, the `postgres-instance` Helm chart is deployed. The `chart` and `version` parameters are given to point to the correct Helm chart, and optional `values` parameters can be used to customize the PostgreSQL deployment.
- Lastly, the `kubeconfig` string is exported. This allows you to access the cluster with kubectl or any Kubernetes-compatible tooling.

### What's Next:

You need to run `pulumi up` within the Pulumi project directory to preview and deploy these changes. Pulumi will automatically handle the creation of resources in the correct