Deploy the hybridnet helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy the hybridnet Helm chart on DigitalOcean Kubernetes Service (DOKS), you'll need to complete a few steps:

1. Set up a DOKS cluster. This will be the Kubernetes cluster where your Helm chart will be deployed.
2. Deploy the Helm chart onto the cluster.

Below you'll find a Pulumi TypeScript program that accomplishes these tasks. I'll go through each step in the code and explain what's happening.

### Step 1: Set up the DOKS cluster

First, you'll need to create a new DOKS cluster with the required configurations such as the region, the size of the node pool, and the number of nodes.

We're using the `digitalocean.KubernetesCluster` resource from the DigitalOcean Pulumi provider, which allows us to create and manage a Kubernetes cluster on DigitalOcean.

### Step 2: Deploy the Helm chart

Once the cluster is up and running, you can deploy your Helm chart to the cluster. To do this, we're using the `kubernetes.helm.v3.Chart` resource from the Kubernetes Pulumi provider.

This resource allows you to deploy a Helm chart into your Kubernetes cluster. You specify the chart name, repository, and any custom values you want to apply. Since we're using DigitalOcean, you'd need to configure Pulumi with access to your DigitalOcean account and token.

Let's jump into the code:

```typescript
import * as pulumi from "@pulumi/pulumi";
import * as digitalocean from "@pulumi/digitalocean";
import * as k8s from "@pulumi/kubernetes";

// Create a DigitalOcean Kubernetes cluster
const cluster = new digitalocean.KubernetesCluster("hybridnet-cluster", {
    region: digitalocean.Regions.NYC1,
    version: "1.21.5-do.0",
    nodePool: {
        name: "default",
        size: digitalocean.DropletSlugs.DropletS2VCPU2GB,
        nodeCount: 2,
    },
});

// Export the Kubeconfig so that kubectl and other tools can communicate with the cluster
export const kubeconfig = cluster.kubeConfigs[0].rawConfig;

// Create a provider instance using the exported kubeconfig
const k8sProvider = new k8s.Provider("do-k8s", {
    kubeconfig: kubeconfig,
});

// Deploy the hybridnet Helm chart into the cluster
const hybridnetChart = new k8s.helm.v3.Chart("hybridnet", {
    chart: "hybridnet",
    version: "1.0.0", // Specify the version of the chart you wish to deploy.
    fetchOpts:{
        repo: "https://charts.your-helm-repo.com", // Replace with the actual repository URL
    },
}, { provider: k8sProvider });

// Export the cluster name and kubeconfig file path for easy access
export const clusterName = cluster.name;
```

### Explanation and Usage

In the provided program, we start by importing the required Pulumi packages for DigitalOcean and Kubernetes. We then define a new Kubernetes cluster resource with the desired configuration.

After creating the cluster, we export its kubeconfig, which is needed to interact with the cluster using Kubernetes tools. Next, we declare a `Provider` for Pulumi's Kubernetes package. This provider uses the kubeconfig we've just exported, ensuring that Pulumi will perform Kubernetes operations against our newly created DOKS cluster.

We then define a `Chart` resource, which represents the Helm chart we want to deploy. We specify the chart name, version, and Helm repository. Note that you need to replace the `repo` with the actual URL of the Helm chart repository where the hybridnet chart is located.

Finally, we export the cluster's name and the kubeconfig, which can be helpful for accessing the cluster outside of Pulumi, like for manual `kubectl` operations.

### Running the Program

To run this Pulumi program:

1. Ensure you have Pulumi installed and configured on your system.
2. Set up your environment with DigitalOcean access by exporting the `DIGITALOCEAN_TOKEN` environment variable.
3. Save the above code to a TypeScript file (e.g., `index.ts`).
4. Run `pulumi up` in the directory where the file resides.

The process will provision a new Kubernetes cluster in your DigitalOcean account and deploy the specified Helm chart. Make sure you have the necessary permissions and quotas on DigitalOcean for creating the resources.