Deploy the k8s-node-image-1-20 helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy a Helm chart on a Digital Ocean Kubernetes Service (DOKS) cluster, you will typically follow these steps:

1. **Set up a Kubernetes cluster** on Digital Ocean, if you haven't done so already. You'll need to gather information like the name of your cluster, the region where you want your cluster to exist, and the size and number of nodes you would like in your node pool.

2. **Install the Helm chart** on your Kubernetes cluster. Helm charts are packages of pre-configured Kubernetes resources. You can deploy applications or services in your cluster using Helm charts.

In our case, we will use Pulumi to programmatically carry out these steps. We'll set up a new DOKS cluster and then deploy a Kubernetes Helm chart representing the `k8s-node-image-1-20`, which we assume is a Helm chart that requires Kubernetes 1.20 (please replace this with the correct Helm chart repository and chart name if it differs).

Before you run this code, make sure that you have the Pulumi CLI installed and you're logged in. Also, make sure to have access to your DigitalOcean token and have `kubectl` and `helm` configured locally, as they are prerequisites for managing resources on DigitalOcean and working with Helm charts.

Below is the Pulumi TypeScript program that does this:

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

// Create a DigitalOcean Kubernetes cluster.
const cluster = new digitalocean.KubernetesCluster("do-cluster", {
    region: "nyc1",
    version: "1.20.x",
    nodePool: {
        name: "default",
        size: "s-2vcpu-2gb",
        nodeCount: 2,
    },
});

// Export the DigitalOcean Kubernetes cluster kubeconfig.
export const kubeconfig = cluster.kubeConfigs[0].rawConfig;

// Use the existing (or create a new) provider to interact with the created cluster.
const k8sProvider = new kubernetes.Provider("k8s-provider", {
    kubeconfig: kubeconfig,
});

// Deploy your Helm chart.
const chartName = "k8s-node-image-1-20"; // Replace with your Helm chart name
const helmChart = new kubernetes.helm.v3.Chart("my-chart", {
    chart: chartName,
    version: "1.0.0", // Specify the chart version you want to deploy
    fetchOpts: {
        repo: "http://charts.example.com/", // Replace with the URL of your Helm chart repository
    },
}, { provider: k8sProvider });

// Export the public IP to access the Helm chart resources if applicable
export const endpoint = helmChart.getResourceProperty("v1/Service", "my-service", "status").apply(status => status.loadBalancer.ingress[0].ip);
```

This Pulumi program defines the following resources:

1. **DigitalOcean Kubernetes Cluster**: It creates a Kubernetes cluster in your specified region with the specific Kubernetes version and number of nodes in the pool.

2. **Kubernetes Provider**: It uses the kubeconfig of the newly created DigitalOcean Kubernetes cluster to communicate with it.

3. **Helm Chart**: It deploys a Helm chart into your Kubernetes cluster. The chart is fetched using the specified repository.

Remember to replace `http://charts.example.com/` with the URL of the Helm repository that hosts your chart and `k8s-node-image-1-20` with the correct chart name.

To run this Pulumi program, save it in a file (e.g., `index.ts`) and execute `pulumi up` in your terminal. This will prompt Pulumi to create the resources and execute the deployment. After it finishes, Pulumi will output any exported values, such as the public IP address for any services that your chart may have exposed.