Deploy the prometheus-exporter helm chart on Kubernetes

Question

Pulumi · Accepted Answer

To deploy the Prometheus Exporter Helm chart on a Kubernetes cluster using Pulumi, we'll be using the Pulumi Kubernetes provider. The Kubernetes provider allows us to manage Kubernetes resources using Pulumi's infrastructure as code approach.

Below is a Pulumi program written in TypeScript which demonstrates how to deploy a Helm chart to a Kubernetes cluster. We utilize the `helm.v3.Chart` class from Pulumi’s Kubernetes provider, which represents a Helm chart in a release. It uses the Helm CLI to deploy the chart, and we can configure it by specifying the chart name, version, values, and other settings. In this case, we'll deploy the `prometheus-exporter` chart.

Before you run the program, you need to have both Pulumi and `kubectl` configured to interact with your Kubernetes cluster. This typically involves being logged into your cloud provider and having `kubectl` configured with the context of the Kubernetes cluster where you want to deploy the Helm chart.

Here is the detailed Pulumi TypeScript program that accomplishes this:

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

const namespace = 'prometheus'; // Change this to the namespace you want to deploy to

const prometheusExporterChart = new k8s.helm.v3.Chart('prometheus-exporter', {
    // You can specify the chart as a repository name and chart name, or you can fetch it from a URL:
    chart: 'prometheus-exporter', // Replace with the correct chart repository/name
    version: 'YOUR_CHART_VERSION', // Specify the version of the chart you want to deploy
    namespace: namespace, // The namespace where you want this chart to be deployed
    fetchOpts: {
        repo: 'https://prometheus-community.github.io/helm-charts', // The Helm chart repository
    },
    values: {
        // Here you specify the configuration values for the chart. This is equivalent to using
        // the '--set' flag when running 'helm install'.
        // Use the appropriate values for the chart you are deploying
        replicaCount: 1,
        service: {
            type: 'LoadBalancer', // Ensures that your Prometheus Exporter is accessible via a LoadBalancer
        },
        // Add other configurations that you want to customize
    },
});

export const chartName = prometheusExporterChart.chartName;
export const namespaceName = prometheusExporterChart.namespace;

```

In this program:

- We import the `@pulumi/kubernetes` package which provides the Pulumi Kubernetes SDK.
- We define a Kubernetes `namespace`, which is where the Helm chart will be deployed.
- We create a new `Chart` resource with a unique name `'prometheus-exporter'`, which tells Pulumi to deploy the Prometheus Exporter Helm chart.

For the `values` object in the `Chart` resource, replace its content with the specific configuration you need for the Prometheus Exporter chart. These values correspond to the customizable parameters of the Helm chart, much like what you would pass to `helm` on the command line using `--set`.

You would then run the program using Pulumi's CLI commands: `pulumi up` to review and deploy the changes, `pulumi stack output` to retrieve the output of the deployment (in this case, the chart name and namespace), and finally `pulumi destroy` to tear down the resources when you're done.

Remember to replace `'YOUR_CHART_VERSION'` and anything in `values` with the actual values for the version of the Prometheus Exporter chart you're deploying and the configuration values specific to your needs. You might need to refer to the chart's documentation for details on different configuration options available.