Deploy the openunison-k8s-cluster-management-by-group helm chart on Rancher

Question

Pulumi · Accepted Answer

To deploy the `openunison-k8s-cluster-management-by-group` Helm chart on a Kubernetes cluster managed by Rancher using Pulumi, we will follow these steps:

1. **Setting up a Rancher Cluster**: We will create or use an existing Rancher-managed Kubernetes cluster in which we will deploy our Helm chart.

2. **Installing Helm**: Helm is a package manager for Kubernetes that allows us to easily deploy and manage applications. We'll be using the Helm Pulumi library for this purpose.

3. **Deploying the Helm Chart**: We will describe how to deploy the `openunison-k8s-cluster-management-by-group` chart into our cluster.

Here is a basic TypeScript program that uses Pulumi to perform these steps:

```typescript
import * as pulumi from "@pulumi/pulumi";
import * as rancher2 from "@pulumi/rancher2";
import * as k8s from "@pulumi/kubernetes";

// Please ensure your Pulumi configuration is correctly set up for the Rancher provider.

// Step 1: Setting up a Rancher Cluster
// This code assumes the Rancher cluster is already set up and we are just going to obtain a reference to it. 
// If you need to create a new cluster, you can use the rancher2.Cluster resource.

// Replace 'my-rancher-cluster' with the actual Rancher Cluster ID
const cluster = rancher2.getCluster({
    name: "my-rancher-cluster"
});

// Step 2: Installing Helm
// We don't have to install Helm separately as Pulumi handles that for us behind the scenes. 
// Instead, we just need to instantiate the Helm chart resource.

// Step 3: Deploying the Helm Chart
// Replace 'NAMESPACE' with the actual Kubernetes namespace where you want to deploy the chart.
// If the namespace does not exist, you can create it using the k8s.core.v1.Namespace resource.
const openunisonChart = new k8s.helm.v3.Chart("openunison-k8s-cluster-management-by-group", {
    chart: "openunison-k8s-cluster-management-by-group",
    version: "CHART_VERSION", // Specify the chart version you wish to deploy
    namespace: "NAMESPACE", // Replace with the target namespace
}, { provider: new k8s.Provider("k8s-provider", { kubeconfig: cluster.kubeConfig }) });

// We use the Rancher2 provider to get the kubeconfig of our cluster,
// which is then fed to the Kubernetes provider to manage the resources in that cluster.
// The Helm chart is deployed within the specified namespace on the Kubernetes cluster managed by Rancher.

export const openunisonChartName = openunisonChart.metadata.name;
```

### Explanation

- **Rancher Cluster**: The above program assumes that you already have a Rancher-managed Kubernetes cluster. The `rancher2.getCluster` function is used to retrieve the existing cluster details from Rancher. If you need to create a new Rancher-managed cluster, you must use the `rancher2.Cluster` resource. Please replace `my-rancher-cluster` with your actual cluster ID.

- **Helm**: Pulumi's Kubernetes provider understands Helm and abstracts away the need to manually install Helm. Instead, we use the `k8s.helm.v3.Chart` class to declare our Helm chart.

- **The `openunison-k8s-cluster-management-by-group` Helm Chart**: You will need to know the version of the chart you want to install and the Kubernetes namespace where it should be installed. Replace `CHART_VERSION` with the correct chart version, and `NAMESPACE` with the target namespace where the chart will be deployed.

- **Providers**: Pulumi providers allow us to interact with different cloud services. In this case, we are using both the Rancher and Kubernetes providers. The Kubernetes provider needs a `kubeconfig` file to interact with the Kubernetes cluster, which we obtain from our Rancher cluster using the Rancher2 provider.

After setting up this program, you run it using the Pulumi command-line interface (CLI) to perform the deployment. Make sure to install the required Pulumi packages by running `npm install` or `yarn add`.