Deploy the prometheus-monitoring-stack helm chart on Rancher

Question

Pulumi · Accepted Answer

To deploy the Prometheus monitoring stack on Rancher using a Helm chart, you'll need to set up a Pulumi program that interacts with the Rancher platform. The program will need to include several steps:

1. Setting up a connection to the Rancher instance using the appropriate provider configuration.
2. Creating or selecting a Kubernetes cluster within Rancher where the Prometheus stack will be deployed.
3. Deploying the Helm chart to the Kubernetes cluster.

The following Pulumi program in TypeScript demonstrates how you would use Pulumi to deploy the Prometheus monitoring stack on a Rancher-managed Kubernetes cluster. Make sure you have Helm and Rancher providers configured in your environment for this code to work. The Helm chart we're using here is the `kube-prometheus-stack`, which is a community-driven Prometheus Operator Helm chart that includes Grafana, Alertmanager, and other components.

First, make sure you import the necessary Pulumi packages in your `index.ts` file:

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

Note: This code assumes you have configured Pulumi to work with your Rancher instance and have the necessary credentials set up to connect to it.

Now, let's write a Pulumi program to deploy the Prometheus monitoring stack:

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

// Step 1: Configure Rancher provider
// Make sure that you have configured Rancher credentials in the Pulumi configuration
const rancherProvider = new rancher2.Provider("rancher", {
    apiUrl: "https://your-rancher-instance-url/v3",
    accessKey: "your-access-key",
    secretKey: "your-secret-key",
});

// Step 2: Select an existing Kubernetes cluster registered in Rancher
const cluster = rancher2.getCluster({
    name: "your-cluster-name",
}, {provider: rancherProvider});

// Kubernetes provider to interact with the selected cluster
const k8sProvider = new kubernetes.Provider("k8s-provider", {
    kubeconfig: cluster.kubeConfig,
});

// Step 3: Deploy the Prometheus monitoring stack using the kube-prometheus-stack Helm chart
const prometheusStack = new kubernetes.helm.v3.Chart("kube-prometheus-stack", {
    chart: "kube-prometheus-stack",
    version: "x.x.x", // Specify the chart version you want to deploy
    fetchOpts:{
        repo: "https://prometheus-community.github.io/helm-charts",
    },
}, {provider: k8sProvider});

// Export the Grafana and Prometheus service URLs
export const grafanaUrl = prometheusStack.getResourceProperty("v1/Service", "kube-prometheus-stack-grafana", "status").apply(status => `http://${status.loadBalancer.ingress[0].hostname}`);
export const prometheusUrl = prometheusStack.getResourceProperty("v1/Service", "kube-prometheus-stack-prometheus", "status").apply(status => `http://${status.loadBalancer.ingress[0].hostname}`);
```

In the above program:

- We set up the Rancher provider using your Rancher API endpoint and access credentials.
- We select an existing Kubernetes cluster registered with Rancher by referencing its `name`.
- We use a Kubernetes provider to interact with the selected cluster using the `kubeConfig` provided by Rancher.
- Then, we use the `kubernetes.helm.v3.Chart` resource to deploy the `kube-prometheus-stack` Helm chart from the Prometheus community Helm repository.
- Finally, we export the Grafana and Prometheus URLs for easy access.

Make sure to replace placeholder strings like `https://your-rancher-instance-url/v3`, `your-access-key`, `your-secret-key`, and `your-cluster-name` with your actual Rancher instance URL, access key, secret key, and the name of your Kubernetes cluster.

Once you have the Pulumi program set up, you can deploy it by running `pulumi up`. Pulumi will provision the resources and execute the Helm chart deployment on your Rancher-managed cluster.

Before running this program, ensure you have Pulumi installed, and you are logged into the Pulumi service or using the Pulumi CLI to manage state locally. If you have questions about the setup or required configurations, please consult the Pulumi documentation for specifics on setting up the Rancher provider and Kubernetes provider.