Deploy the prometheus-operator-csv helm chart on Rancher

Question

Pulumi · Accepted Answer

To deploy the `prometheus-operator-csv` Helm chart on a Rancher-managed Kubernetes cluster using Pulumi, you need to perform several steps. The deployment includes setting up a Rancher cluster if one is not already in place, installing the Helm chart into the cluster, and possibly configuring Rancher settings to accommodate the Helm chart.

We will create a Pulumi TypeScript program that:
1. Establishes a connection to the Rancher instance using the `rancher2` provider.
2. Deploys a Kubernetes cluster in Rancher (if needed).
3. Configures Rancher to install the Helm chart repository if it isn't already configured.
4. Deploys the `prometheus-operator-csv` Helm chart onto the cluster using the `helm.v3.Chart` resource.

Before you begin, you should have the Rancher2 provider configured in your environment. This configuration isn't specific to Pulumi and typically involves setting environment variables that the Rancher2 provider will use for authentication.

Here is the Pulumi TypeScript program that will accomplish these steps:

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

// Define the configuration for connecting to your Rancher instance (you might need to adjust these according to your setup).
const rancherConfig = {
    // You will need to provide your Rancher API URL and Access Key through environment variables or some other configuration mechanism
    apiUrl: "https://your-rancher-api-url", // Replace with your Rancher API URL
    accessKey: "your-rancher-access-key",   // Replace with your Rancher access key
    secretKey: "your-rancher-secret-key",   // Replace with your Rancher secret key
};

// Create a new Rancher2 provider instance using the specified settings.
const rancherProvider = new rancher2.Provider("my-rancher-provider", {
    apiUrl: rancherConfig.apiUrl,
    accessKey: rancherConfig.accessKey,
    secretKey: rancherConfig.secretKey,
});

// If you already have a cluster created in Rancher, you can skip this step.
// The following is an example of how a cluster can be launched using the Rancher2 provider.
// Assume the configuration of a cluster with the necessary specifications for the Helm chart.

const cluster = new rancher2.Cluster("my-cluster", /* Provide the necessary properties for your cluster here */, { provider: rancherProvider });

// Now, let's configure a Catalog within Rancher to allow us to install the prometheus-operator-csv Helm chart.
// Replace the `url` and other catalog properties with the correct ones for the prometheus-operator-csv chart.
const catalog = new rancher2.CatalogV2("prometheus-catalog", {
    url: "https://prometheus-community.github.io/helm-charts", // The repository URL of the helm chart for the prometheus operator.
    clusterId: cluster.id,
    /* You can set more properties on the Catalog if needed */
}, { provider: rancherProvider });

// Once we have the cluster and the Catalog ready, we use the pulumi/kubernetes provider to deploy Helm charts.

// Initialize a Kubernetes provider instance with the kubeconfig obtained from the Rancher cluster.
const k8sProvider = new k8s.Provider("k8s-provider", {
    kubeconfig: cluster.kubeConfig,
    // Make sure your cluster is properly configured to provide kubeconfig
});

// Deploy the prometheus-operator-csv Helm chart.
const prometheusChart = new k8s.helm.v3.Chart("prometheus-operator", {
    chart: "prometheus-operator-csv",
    version: "your-chart-version", // Specify the version of the chart you want to deploy.
    fetchOpts: {
        repo: "https://prometheus-community.github.io/helm-charts", // URL of the helm repository.
    },
    /* Include any required values for customizing the Helm chart */
}, { provider: k8sProvider });

// Export the stable URL of the Prometheus server.
export const prometheusUrl = prometheusChart.getResourceProperty("v1/Service", "prometheus-operator-csv-prometheus", "status").apply(status => status.loadBalancer.ingress[0].hostname);
```

Let's go through the program step-by-step:

- **Provider Setup**: We set up our Rancher provider using the `@pulumi/rancher2` package. This provider interacts with your Rancher instance, allowing Pulumi to create resources in Rancher.

- **Cluster Deployment**: We deploy a new cluster in Rancher using the `rancher2.Cluster` resource. If you already have a cluster in Rancher, you can skip this part or use the existing cluster's information here.

- **Catalog Configuration**: We set up a Rancher Catalog that points to the repository containing the `prometheus-operator-csv` Helm chart. This step is required if the Helm chart is not already available in one of your configured Catalogs.

- **Kubernetes Provider**: We then initialize a `pulumi/kubernetes` provider configured with the `kubeconfig` of the Rancher-deployed cluster. This allows Pulumi to deploy Kubernetes resources onto the cluster.

- **Helm Chart Deployment**: Finally, we deploy the `prometheus-operator-csv` Helm chart into the Kubernetes cluster using the `k8s.helm.v3.Chart` resource. We specify the chart, version, and repository URL.

Be sure to replace placeholder values (like `https://your-rancher-api-url`, `your-rancher-access-key`, `your-rancher-secret-key`, and `your-chart-version`) with actual values that are appropriate for your setup.

The `prometheusUrl` export will provide the access URL for your Prometheus server once it is deployed and running. This assumes that the service is of type `LoadBalancer` and that your cloud provider supports this type of service.

To set up and run this Pulumi program, you'll need to:
1. Replace placeholders with actual values for your environment.
2. Install Pulumi CLI and the necessary providers (`@pulumi/rancher2` and `@pulumi/kubernetes`).
3. Use `pulumi up` to preview and deploy the resources described in the program.

This will create the Kubernetes cluster in the Rancher environment, install the catalog with the `prometheus-operator-csv` Helm chart, and deploy the chart to the cluster.