Deploy the pgbench helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy the `pgbench` Helm chart on the DigitalOcean Kubernetes Service using Pulumi, you will need to perform the following steps:

1. Create a new DigitalOcean Kubernetes cluster.
2. Install the Helm chart for `pgbench` into the Kubernetes cluster.

I will be crafting a Pulumi program in TypeScript, which will execute the above steps. Before you run this program, please ensure that you have the following prerequisites:

- Pulumi CLI installed and set up to work with your DigitalOcean account.
- Access to your DigitalOcean account and personal access tokens generated with read and write permissions.
- Helm CLI installed locally if you need to fetch any Helm chart values or configurations beforehand.
  
Please note that `pgbench` is a benchmarking tool for PostgreSQL. The assumption here is that you want to deploy a Helm chart named `pgbench`. If `pgbench` does not have a designated Helm chart, you will need to either create one or use an existing PostgreSQL chart and configure it to perform benchmarking.

Below is the detailed Pulumi program:

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

// Define the configuration variables for the DigitalOcean cluster
const clusterName = 'do-pgbench-cluster';
const region = 'nyc1';  // New York City region; change this to your preferred region
const nodeSize = 's-2vcpu-2gb';  // The size identifier for the nodes in the Kubernetes cluster
const nodeCount = 2;  // The number of nodes to deploy in the Kubernetes cluster

// Create a new DigitalOcean Kubernetes cluster
const cluster = new digitalocean.KubernetesCluster(clusterName, {
    region: region,
    version: 'latest',  // Use the latest available Kubernetes version
    nodePool: {
        name: 'default',
        size: nodeSize,
        nodeCount: nodeCount,
    },
});

// Create a new Kubernetes provider instance that uses the generated kubeconfig from our cluster
const k8sProvider = new kubernetes.Provider('k8s-provider', {
    kubeconfig: cluster.kubeConfigs[0].rawConfig,
});

// Deploy the 'pgbench' Helm chart on our DigitalOcean Kubernetes cluster
const pgbenchChart = new kubernetes.helm.v3.Chart('pgbench', {
    chart: 'pgbench',  // This should be the actual chart name if it exists
    version: '1.0.0',  // Specify the version of the chart you wish to deploy
    // If 'pgbench' does not have an official chart, you can use another PostgreSQL chart
    // and customize the values.yaml to perform the benchmarking.
    namespace: 'default',  // The namespace to deploy the chart into
    values: {
        // You would place your custom Helm values here, following the schema of the chart.
    },
}, { provider: k8sProvider });

// Export the cluster's kubeconfig and endpoint so that they can be used to interact with the cluster
export const kubeconfig = cluster.kubeConfigs[0].rawConfig;
export const endpoint = cluster.endpoint;

```

Here's a breakdown of what the Pulumi program is doing:

1. Imports the necessary Pulumi libraries for DigitalOcean (`@pulumi/digitalocean`) and Kubernetes (`@pulumi/kubernetes`).
2. Establishes configuration variables (such as the cluster name, region, node size, and node count) required for creating a Kubernetes cluster in DigitalOcean.
3. Provisions a new Kubernetes cluster using the `digitalocean.KubernetesCluster` resource. The cluster's version is set to the latest, and it includes a default node pool with the defined specifications from the configuration variables.
4. Sets up a new `kubernetes.Provider`, which uses the kubeconfig of the newly created cluster, allowing you to interact with this Kubernetes cluster using Pulumi.
5. Deploys the `pgbench` Helm chart (hypothetical in this context, as it requires an actual existing chart) onto the DigitalOcean Kubernetes cluster using the `helm.v3.Chart` resource. You would need to replace `'pgbench'` with the actual chart name and provide the corresponding values.
6. Exports the kubeconfig and Kubernetes API endpoint for the cluster to allow further interactions such as using `kubectl` or other Kubernetes tools.

Remember to replace placeholder values like the `chart` name and `values` with the actual chart information and customization options specific to `pgbench`. If `pgbench` does not have its Helm chart, you will need to use a PostgreSQL chart and configure it accordingly.

This Pulumi program should be saved in a file (e.g., `index.ts`), and then you can use the Pulumi CLI to create and deploy the stack. After that, you can run the standard Pulumi commands (`pulumi up` to deploy, `pulumi destroy` to cleanup, etc.) in your terminal to interact with your infrastructure.