Deploy the topologyspread-webhook helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy a Helm chart like `topologyspread-webhook` on DigitalOcean Kubernetes Service (DOKS), you would follow these steps using Pulumi:

1. First you would need to set up the DigitalOcean Kubernetes cluster.
2. Once the cluster is available, you would configure Pulumi to use the kubeconfig of the DOKS cluster.
3. Next you would deploy the Helm chart using Pulumi's Kubernetes provider.

I'll guide you through each step of the process with explanations and then provide you with a complete Pulumi TypeScript program.

### DigitalOcean Kubernetes Cluster Setup

To create a Kubernetes cluster on DigitalOcean, you can use the `digitalocean.KubernetesCluster` resource from the Pulumi DigitalOcean provider. You will need to specify properties such as the region where you want your cluster located, the version of Kubernetes you want to run, and the node pool configuration.

### Configure Kubernetes Provider

After the DOKS cluster is set up, Pulumi needs to interact with it. For that, you'll use the `KubernetesProvider` resource, which will utilize the generated kubeconfig from the cluster to manage resources within it.

### Deploying the Helm Chart

With the Kubernetes provider configured, you can now deploy your Helm chart to the cluster. The `kubernetes.helm.v3.Chart` resource from Pulumi's Kubernetes provider is what you will use for this. You need to provide it with the chart name, repository (if it's not a locally available chart), and any custom values you want to pass to the chart.

Let's put this all together in a Pulumi TypeScript program.

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

// Step 1: Create the DigitalOcean Kubernetes cluster.
const cluster = new digitalocean.KubernetesCluster("doks-cluster", {
    region: "nyc1", // This should be a region supported by DOKS.
    version: "1.20", // Ensure this version is supported by your chart and DOKS.
    nodePool: {
        name: "default-pool",
        size: "s-2vcpu-2gb", // The type of nodes you'd like in your pool.
        nodeCount: 2, // The number of nodes in the node pool.
    },
});

// Step 2: Configure the Kubernetes provider with the kubeconfig from the newly created DOKS cluster.
const k8sProvider = new kubernetes.Provider("k8s-provider", {
    kubeconfig: cluster.kubeConfigs[0].rawConfig,
});

// Step 3: Deploy the topologyspread-webhook Helm chart.
const chart = new kubernetes.helm.v3.Chart("topologyspread-webhook-chart", {
    chart: "topologyspread-webhook",
    version: "0.1.0", // Replace with the desired chart version.
    // Uncomment and configure below lines if the helm chart is in a helm repo.
    // repo: "https://example.com/helm-charts", 
    fetchOpts: {
        repo: "https://charts.example.com/", // Replace with the Helm repository URL.
    },
    values: {
        // Add any required custom values here.
    },
}, { provider: k8sProvider });

// Stack export to output the Kubernetes cluster name.
export const clusterName = cluster.name;
```

To use this code, create a new Pulumi project, replace the placeholders with actual values, and run the Pulumi commands (`pulumi up`) to deploy your cluster and the Helm chart.

### Important Notes:

- Replace `"https://charts.example.com/"` with the actual Helm repository URL where the `topologyspread-webhook` chart is available.
- Set the `chart` property to the name of the chart you wish to deploy.
- Adjust the `values` object to pass any necessary parameters to your helm chart.
- Ensure that the version of DOKS and the node sizes are appropriate for your workload and budget.
- The `repo` and `version` inside the `Chart` are optional based on whether the chart is from a Helm repository or a local chart.

After you run your pulumi program, the DigitalOcean Kubernetes cluster will be created, and the `topologyspread-webhook` Helm Chart will be deployed to it.