Deploy the Data on Kuberenetes K8ssandra Chart helm chart on Azure Managed Openshift Service

Question

Pulumi · Accepted Answer

Deploying a Helm chart to Kubernetes, specifically using the K8ssandra chart on an Azure Managed OpenShift service, involves several steps. We need to first create an Azure Managed OpenShift cluster, and then deploy the Helm chart to this cluster.

Below is a high-level description of the steps we'll take in the Pulumi program:

1. Set up the Azure Managed OpenShift cluster.
2. Deploy the K8ssandra Helm chart onto the cluster.

Pulumi's infrastructure as code framework allows us to define and manage these resources in a reliable and repeatable manner. We'll perform these steps using TypeScript.

### Program Explanation

We start by importing the necessary Pulumi packages. We'll need the `azure-native` package to create and manage Azure resources (like the Managed OpenShift cluster) and the `kubernetes` package to work with Kubernetes resources, such as the Helm chart.

For the Azure Managed OpenShift cluster (`azure-native.containerservice.OpenShiftManagedCluster`), we'll specify the necessary parameters, such as location, resource group, and the OpenShift version. Pulumi manages the dependencies between resources, so the Helm chart deployment will only begin once the OpenShift cluster is ready.

For the deployment of the K8ssandra Helm chart, we utilize Pulumi's Helm Chart resource (`kubernetes.helm.v3.Chart`). This resource allows you to specify the chart name, version, and any custom configuration options that K8ssandra may require.

The script provided will assume that you already have Pulumi and the necessary cloud provider CLI set up and logged in, and that the `azure-native` and `kubernetes` plugins are installed. Please refer to the [Pulumi documentation](https://www.pulumi.com/docs/get-started/kubernetes/) on how to get started with Pulumi and Kubernetes if you're not familiar with that setup.

Now, let's look at the Pulumi program that performs the above-mentioned tasks.

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

// Create an Azure Resource Group
const resourceGroup = new azure.resources.ResourceGroup("myResourceGroup", {
    resourceGroupName: "myResourceGroup",
    location: "East US",  // Replace with the desired Azure region
});

// Create Azure Managed OpenShift cluster
const openshiftCluster = new azure.containerservice.OpenShiftManagedCluster("myOpenShiftCluster", {
    resourceName: "myOpenShiftCluster",
    resourceGroupName: resourceGroup.name,
    location: resourceGroup.location,
    openShiftVersion: "4.3",  // Specify the desired OpenShift version
    // Add additional properties according to your deployment needs
});

// Using the K8ssandra chart from the Helm repository
const k8ssandraChart = new k8s.helm.v3.Chart("k8ssandra", {
    chart: "k8ssandra",
    version: "1.0.0",  // Specify the chart version you want to deploy
    fetchOpts: {
        repo: "https://helm.k8ssandra.io/",  // Official K8ssandra Helm repository
    },
}, { provider: new k8s.Provider("k8s", { kubeconfig: openshiftCluster.kubeconfig }) });

// Export the kubeconfig of the cluster and the name of the Chart
export const kubeconfig = openshiftCluster.kubeconfig;
export const k8ssandraChartName = k8ssandraChart.metadata.apply(m => m.name);
```

In this program:

- We're creating a new Resource Group to contain our Azure Managed OpenShift cluster resources.
- We then declare a Managed OpenShift cluster with the desired OpenShift version and other configurations.
- Once the cluster is available, we deploy the K8ssandra Helm chart using Pulumi's Kubernetes provider, which needs the kubeconfig provided by the OpenShift cluster resource.
- We export the kubeconfig which can be used to interact with the OpenShift cluster via `kubectl` or other Kubernetes tools.
- We also export the name of the K8ssandra chart, which can be useful for future operations like upgrades and rollbacks.

Please note that the program is a basic setup for deploying the K8ssandra chart onto Azure Managed OpenShift Service. Depending on the K8ssandra chart's configuration requirements and your specific environment settings, additional customization of the chart's `values` or the OpenShift cluster might be necessary. Always refer to the official [K8ssandra documentation](https://k8ssandra.io/docs/) and the [Azure OpenShift documentation](https://docs.microsoft.com/en-us/azure/openshift/) for more detailed and advanced configurations.