Deploy the prometheus-monitoring-stack helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy the Prometheus monitoring stack using a Helm chart on Digital Ocean's Kubernetes Service, we will go through the following steps:

1. Provision a DigitalOcean Kubernetes cluster.
2. Install the Prometheus monitoring stack using the Helm chart.

### Provision a DigitalOcean Kubernetes Cluster

First, we'll create a new Kubernetes cluster on DigitalOcean. To do this, we use the `digitalocean.KubernetesCluster` resource, which enables us to define the configuration of the cluster, such as the region, version, and size of the node pool.

### Install the Prometheus Monitoring Stack Using Helm

After the cluster is up and running, we'll need to install the Helm chart for the Prometheus monitoring stack. We can do this using the `kubernetes.helm.v3.Chart` resource, which allows us to specify the chart to use, any values we want to override, and the namespace the chart should be installed into.

Below is a TypeScript program that illustrates how to accomplish both of these tasks using Pulumi. Make sure you have your Pulumi and DigitalOcean access configurations set up before running this program.

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

// Step 1: Provision a DigitalOcean Kubernetes cluster.
const cluster = new digitalocean.KubernetesCluster('do-cluster', {
    region: digitalocean.Regions.NYC1,
    version: 'latest', // Use the latest available version for the Kubernetes cluster
    nodePool: {
        size: digitalocean.DropletSlugs.DropletS1VCPU2GB, // The size of the droplet (VM)
        nodeCount: 2, // Number of nodes in the NodePool
        name: 'default-pool', // Name of the NodePool
    },
});

// Step 2: Install the Prometheus monitoring stack using a Helm chart.
// We will use the `kubeconfig` output from the cluster to configure our Kubernetes provider.
const k8sProvider = new k8s.Provider('k8s-provider', {
    kubeconfig: cluster.kubeConfigs[0].rawConfig, // Authenticate using the kubeconfig from the newly created cluster
});

// Define the Helm chart for the Prometheus monitoring stack.
const prometheusChart = new k8s.helm.v3.Chart('prometheus', {
    chart: 'prometheus',
    version: '11.16.9', // Specify the version of the Helm chart
    fetchOpts:{
        repo: 'https://prometheus-community.github.io/helm-charts', // The repository where the chart is located
    },
}, { provider: k8sProvider }); // Make sure to associate the k8s Provider with the Helm chart resource

// Export the cluster's kubeconfig and the Prometheus chart's status.
export const kubeConfig = cluster.kubeConfigs[0].rawConfig;
export const prometheusStatus = prometheusChart.status;
```

This program will automate the process of setting up a Kubernetes cluster in DigitalOcean and deploying the Prometheus monitoring stack to it. The first part of the program creates a DigitalOcean Kubernetes (DOKS) cluster. The second part creates an instance of the `kubernetes.helm.v3.Chart` resource to deploy Prometheus.

Once the program is executed with `pulumi up`, Pulumi will set up the resources in the defined order, taking care of the dependencies. After the deployment, you will get outputs from Pulumi that include the Kubernetes cluster's kubeconfig and the status of the Prometheus deployment.

For more information, you can refer to the [DigitalOcean Kubernetes Cluster documentation](https://www.pulumi.com/registry/packages/digitalocean/api-docs/kubernetescluster/) and the [Helm Chart documentation](https://www.pulumi.com/registry/packages/kubernetes/api-docs/helm/v3/chart/).