Deploy the bind9 helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy the bind9 Helm chart on DigitalOcean Kubernetes Service using Pulumi, you will need to follow a series of steps. I'll guide you through these steps by creating a Pulumi program in TypeScript.

1. **Setting Up Your Project**: Before creating the Kubernetes cluster, make sure you have a Pulumi project set up. If you don't have a project, you can create one by running the `pulumi new` command and choosing the TypeScript template.

2. **Creating a Kubernetes Cluster in DigitalOcean**: Use the `digitalocean.KubernetesCluster` resource to provision a Kubernetes cluster.

3. **Deploying the Helm Chart**: Once the cluster is up, we'll use the `kubernetes.helm.v3.Chart` resource from the Pulumi Kubernetes provider to deploy the bind9 Helm chart onto the DigitalOcean cluster.

Below is a complete Pulumi TypeScript program that accomplishes the creation of a DigitalOcean Kubernetes cluster and the deployment of the bind9 chart. As we walk through the code, I'll explain each part.

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

// Define the DigitalOcean Kubernetes cluster
const cluster = new digitalocean.KubernetesCluster('do-cluster', {
    region: digitalocean.Regions.NYC1, // Specify the region where the cluster will be created
    version: 'latest', // Specify the version of Kubernetes. Use 'latest' or choose a specific version
    nodePool: {
        name: 'default-pool',
        size: digitalocean.DropletSlugs.DropletS4VCPU8GB,
        nodeCount: 2, // The number of Droplets to create in the node pool.
    },
});

// Export the cluster's kubeconfig
export const kubeconfig = cluster.kubeConfigs.apply(kc => kc[0].rawConfig);

// Define the Helm chart for bind9
const helmChart = new kubernetes.helm.v3.Chart('bind9-chart', {
    chart: 'bind9',
    fetchOpts: {
        repo: 'https://charts.bitnami.com/bitnami',
    },
    // Specify the namespace where the chart should be deployed
    namespace: 'default',
}, { 
    provider: new kubernetes.Provider('k8s-provider', {
        kubeconfig: kubeconfig,
    }),
});

// Export the endpoint to access bind9
export const bind9Endpoint = pulumi.interpolate`http://chart-example.local`;
```

Here's what each part of the program is doing:

- The `digitalocean.KubernetesCluster` resource is used to create a Kubernetes cluster in the specified region with the given parameters for the node pool, including the number of nodes and their size.

- We then export the `kubeconfig`, which is necessary to interact with the Kubernetes cluster using `kubectl` and other tools, such as the Kubernetes provider within Pulumi.

- The `kubernetes.helm.v3.Chart` resource deploys the specified Helm chart (`bind9` in this case) onto the Kubernetes cluster we've just provisioned. We're using the Bitnami repository as it hosts the bind9 chart.

- We provide a Kubernetes provider to the Helm chart resource explicitly to ensure it uses the kubeconfig of the newly created DigitalOcean cluster.

- Lastly, we attempt to export an endpoint for bind9. Note, this is a placeholder value for `http://chart-example.local` as the actual endpoint would depend on how the bind9 Helm chart exposes itself (e.g., a service of type LoadBalancer might expose an external IP).

Please note that while we use the `latest` version for the Kubernetes cluster in the example, it is generally good practice to use a specific version to ensure consistency across different deployments.

To use this program:

1. Save it to a file named `index.ts` in your Pulumi project directory.
2. Run `pulumi up` to preview and deploy the changes. Pulumi will show you the preview and, upon confirmation, proceed to create the resources.

Remember to check the documentation of the bind9 Helm chart to know what values you can provide for additional configuration as needed.