Deploy the prometheus-storage-adapter helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To accomplish the deployment of the Prometheus Storage Adapter Helm chart on the Digital Ocean Kubernetes Service using Pulumi, we'll go through several steps. First, we'll create a Kubernetes cluster on Digital Ocean, and then we'll deploy the Helm chart to this cluster.

The resources we will use are:
1. `digitalocean.KubernetesCluster` is the Pulumi resource for creating and managing a Kubernetes cluster on DigitalOcean. You can specify various configurations like the region, version, and node size for the cluster.
2. `kubernetes.helm.v3.Chart` from the Kubernetes package, which represents a Helm chart that can be deployed into a Kubernetes cluster. It'll allow you to install the Prometheus Storage Adapter chart.

Here is a TypeScript program that uses Pulumi to deploy the Helm chart on a Digital Ocean Kubernetes cluster:

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

// Create a DigitalOcean Kubernetes cluster with the desired configurations.
const cluster = new digitalocean.KubernetesCluster("do-cluster", {
    region: "nyc1", // Select the region where you want to deploy your cluster. Change as needed.
    version: "1.21.5-do.0", // Specify the version of Kubernetes to use.
    nodePool: {
        name: "default", // Name of the node pool.
        size: "s-1vcpu-2gb", // The size of the nodes to deploy (this is the smallest size available).
        nodeCount: 1, // The number of nodes to deploy.
    },
});

// Once the cluster is provisioned, we can create a Kubernetes provider instance using the kubeconfig.
const k8sProvider = new k8s.Provider("do-k8s-provider", {
    kubeconfig: cluster.kubeConfigs[0].rawConfig, // Use the kubeconfig from the created cluster.
});

// Use the Helm Chart resource to deploy the Prometheus Storage Adapter.
const prometheusStorageAdapterChart = new k8s.helm.v3.Chart("prometheus-storage-adapter", {
    chart: "prometheus-storage-adapter", // The name of the Helm chart you want to deploy.
    // Specify any custom values file or configuration for the Helm chart.
    values: {
        // You can provide values to configure the Prometheus Storage Adapter Helm Chart as needed.
        // For example, change service type, configure persistent storage, etc. These are placeholders.
        service: {
            type: "ClusterIP",
        },
        storage: {
            size: "8Gi",
        },
    },
    namespace: "default", // Namespace to deploy the Helm chart. Change if you have a different one.
}, { provider: k8sProvider });

// Export the cluster's kubeconfig.
export const kubeconfig = cluster.kubeConfigs[0].rawConfig;
```

This program performs the following actions:
1. It declares a new DigitalOcean Kubernetes cluster resource with configurations including region, Kubernetes version, size, and the number of nodes in the node pool. 
2. It creates a Pulumi Kubernetes provider to interact with the newly created cluster using the cluster's `kubeconfig`. 
3. It deploys the Prometheus Storage Adapter Helm chart using the `Chart` resource from the `@pulumi/kubernetes` package. To properly configure Helm chart deployment, you might need to specify the chart version or any other values according to the features you intend to use.

Please note that you should have Pulumi installed, along with the right to access DigitalOcean and a DigitalOcean token configured for Pulumi. The exact details for configuring Pulumi with Digital Ocean and deploying the code will depend on your local development environment and setup.

To learn more about the specific resources used in this Pulumi program, you can visit the documentation pages for [DigitalOcean KubernetesCluster](https://www.pulumi.com/registry/packages/digitalocean/api-docs/kubernetescluster/) and [Kubernetes Helm Chart](https://www.pulumi.com/registry/packages/kubernetes/api-docs/helm/v3/chart/).