Deploy the twampy helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

Deploying a Helm chart on a Kubernetes cluster can be a sterling way to manage and deploy your applications smoothly. For this task on Digital Ocean, we'll be needing two primary resources from Pulumi:

1. `digitalocean.KubernetesCluster`: This will provision a Kubernetes cluster on Digital Ocean.
2. `kubernetes.helm.sh/v3.Chart`: We'll use this to deploy a Helm chart on the Kubernetes cluster that we've created.

Let me guide you through the process:

- We'll start by setting up a Digital Ocean Kubernetes cluster using the `digitalocean.KubernetesCluster` resource.
- Then we'll use Pulumi's Kubernetes provider to deploy the desired Helm chart (in this case, `twampy`).
- Note that the actual parameters for the Helm chart might vary based on the specifics of `twampy`, which you'll need to obtain from the chart's documentation.
- For simplicity's sake, I will assume `twampy` is hosted on a public Helm repository; if it's not, you'll need to adjust the `repo` and `chart` properties accordingly.

Let's walk through the code:

```typescript
import * as pulumi from "@pulumi/pulumi";
import * as digitalocean from "@pulumi/digitalocean";
import * as k8s 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-2vcpu-2gb",
        nodeCount: 2,
    },
});

// Kubernetes provider that uses the kubeconfig from the generated Digital Ocean cluster
const k8sProvider = new k8s.Provider("do-k8s", {
    kubeconfig: cluster.kubeConfigs[0].rawConfig,
});

// Deploy the twampy Helm chart into the DO Kubernetes cluster
const twampyChart = new k8s.helm.v3.Chart("twampy", {
    chart: "twampy",
    version: "1.0.0",     // Replace with the actual chart version
    fetchOpts: {
        repo: "http://helm-repo-url/charts",  // Replace with the actual Helm repo URL where twampy is hosted
    },
}, { provider: k8sProvider });

// Export the cluster's kubeconfig and the Helm chart deployment status
export const kubeconfig = cluster.kubeConfigs[0].rawConfig;
export const twampyStatus = twampyChart.status;
```

Here's what each part of this code does:

- We import the necessary Pulumi modules for Kubernetes, Digital Ocean, and the Pulumi SDK.
- We instantiate a new Digital Ocean Kubernetes cluster, setting some basic configuration like region, version, and node pool size.
- The `k8sProvider` is a Pulumi Kubernetes provider that is set up to use the kubeconfig of our Digital Ocean Kubernetes cluster.
- The `twampyChart` definition will manage the lifecycle of the twampy Helm chart using the chart's name, version, and the Helm repository location.
- Finally, we export the kubeconfig and the Helm chart status, which could be used to interact with the cluster and check the deployment from outside Pulumi.

Remember that you'll need to replace placeholders like `"http://helm-repo-url/charts"` with the actual Helm repository URL where `twampy` is available. The version `1.0.0` should also be adjusted to reflect the version of `twampy` you want to deploy.

Configure Pulumi to use your Digital Ocean access token (as set within your Pulumi stack's configuration or using the `DIGITALOCEAN_TOKEN` environment variable). Ensure that you have the Pulumi CLI and Digital Ocean CLI installed and configured on your system.

After setting up your Pulumi project, you can run `pulumi up` to provision the resources and deploy the chart. Pulumi will print out the expected changes before applying them, and if you confirm, it will start provisioning the Kubernetes cluster followed by deploying the `twampy` Helm chart onto it.