Deploy the uoapp helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy a Helm chart on Digital Ocean Kubernetes, we will use two main resources from Pulumi's Digital Ocean and Kubernetes providers:

1. `digitalocean.KubernetesCluster`: This resource will be used to create a new Kubernetes cluster in Digital Ocean. A Kubernetes cluster is a set of node machines for running containerized applications. If you already have a cluster, you can skip the creation step or adapt the code to point to your existing cluster.

2. `kubernetes.helm.v3.Chart`: This resource represents a Helm chart, which is a set of pre-configured Kubernetes resources. Helm charts help you define, install, and upgrade even the most complex Kubernetes applications.

We will follow these steps in the code:
- Define a new Kubernetes cluster in Digital Ocean.
- Deploy the Helm chart on that cluster.

Here is a TypeScript program that achieves this:

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

// Step 1: Create a new Digital Ocean Kubernetes Cluster
const cluster = new digitalocean.KubernetesCluster("do-cluster", {
    region: "nyc1",
    version: "latest", // Specify your desired Kubernetes version
    nodePool: {
        name: "default-pool",
        size: "s-2vcpu-2gb", // Select the Droplet size
        nodeCount: 2,        // Specify the number of Droplet instances in the node pool
    },
});

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

// Step 2: Create a Kubernetes provider instance using the created cluster's kubeconfig
const k8sProvider = new kubernetes.Provider("k8s-provider", {
    kubeconfig: kubeconfig,
});

// Step 3: Deploy the Helm chart on the Kubernetes cluster
const helmChart = new kubernetes.helm.v3.Chart("uoapp-chart", {
    chart: "uoapp",      // Replace 'uoapp' with the name of your actual Helm chart
    version: "1.0.0",    // Specify the version of the Helm chart
    // values: {},       // Add any chart values here if needed
}, { provider: k8sProvider });

// Export the Helm chart status and other required outputs if necessary
export const helmChartStatus = helmChart.status;

```

In the program above:
- We start by importing the necessary Pulumi packages for Digital Ocean and Kubernetes (`@pulumi/digitalocean` and `@pulumi/kubernetes`).
- We then create a new Kubernetes cluster on Digital Ocean with the specified region, version, and Droplet size in the node pool.
- We export the kubeconfig, which is necessary for our Kubernetes provider to interact with our Digital Ocean Kubernetes cluster.
- We set up a Pulumi Kubernetes provider specifying the kubeconfig fetched from the newly created cluster.
- Finally, we use the Kubernetes provider to deploy a Helm chart specifying the name and version of the chart.

Remember to replace `"uoapp"` with the name of your Helm chart, and `"1.0.0"` with the version of the chart that you intend to deploy. If your Helm chart requires specific values, you can provide them in the `values` field within the `helm.v3.Chart` resource.

You need to have Pulumi and the Digital Ocean CLI installed and configured. Run `pulumi up` to deploy the cluster and the Helm chart.

Please note that this code assumes you're starting from scratch; if your chart is within your local file system or has specific configurations, adjustments would be needed. Furthermore, while this creates a new Kubernetes cluster for you, you could already have an existing cluster in which case certain steps to create a new cluster could be omitted.