Deploy the oracledb-exporter helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

Deploying the `oracledb-exporter` Helm chart on Digital Ocean Kubernetes Service (DOKS) involves several steps, which include setting up the Kubernetes cluster on Digital Ocean and then using the Helm chart resource type from the `kubernetes` package to deploy `oracledb-exporter`.

First, you need to create a Kubernetes cluster on Digital Ocean. Pulumi allows you to define this infrastructure using code, which can be versioned and reused. You'll be using the `digitalocean.KubernetesCluster` resource to create a new cluster.

After setting up the cluster, you need to deploy the `oracledb-exporter` Helm chart onto it. For this, Pulumi provides the `kubernetes.helm.sh/v3.Chart` resource type that can be used to deploy Helm charts.

Here's a comprehensive program in TypeScript that accomplishes these tasks:

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

// Create a Digital Ocean Kubernetes Cluster
const cluster = new digitalocean.KubernetesCluster("do-cluster", {
    region: "nyc3",
    version: "latest",
    nodePool: {
        name: "default",
        size: "s-1vcpu-2gb", // This is the smallest node size available
        nodeCount: 2, // Number of nodes in the node pool
    },
});

// Once the cluster is created, you can configure Pulumi to use the cluster's kubeconfig.
// This will be used for Helm chart deployment.
const k8sProvider = new kubernetes.Provider("k8s-provider", {
    kubeconfig: cluster.kubeConfigs[0].rawConfig,
});

// Deploy the oracledb-exporter helm chart
const oracledbExporterChart = new kubernetes.helm.sh.v3.Chart("oracledb-exporter", {
    chart: "oracledb-exporter",
    // Specify the repository containing the Helm chart
    fetchOpts: { 
        repo: "https://helm-repository-where-oracledb-exporter-is-hosted.com",
    },
    // Alternatively, you can specify chart version, values, and other configuration parameters directly in the Chart resource.
}, { provider: k8sProvider });

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

// Now you can access the cluster using the kubeconfig and deploy workloads.
```

**Explanation of the resources used and why:**

- `digitalocean.KubernetesCluster`: This resource is used to create a Kubernetes cluster on the Digital Ocean platform. In this example, the cluster is created in the `nyc3` region with the `latest` version of Kubernetes. The node pool is configured with a specific machine size and count, setting the desired capacity for the cluster.

- `kubernetes.Provider`: This is a Pulumi provider that is responsible for the deployment and management of Kubernetes resources. It is configured with the kubeconfig of the just-created Digital Ocean Kubernetes cluster, allowing subsequent resources to be deployed into this cluster.

- `kubernetes.helm.sh/v3.Chart`: This resource is used to deploy a Helm chart, which is a package containing pre-configured Kubernetes resources. In this case, the `oracledb-exporter` chart is specified. The `fetchOpts` property allows you to provide the repository URL where the Helm