Deploy the multitenant helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy a multi-tenant Helm chart on the DigitalOcean Kubernetes Service using Pulumi, you’ll need to follow these steps:

1. **Create a DigitalOcean Kubernetes cluster**: You'll start by defining the infrastructure for the Kubernetes cluster on DigitalOcean.
2. **Deploy the Helm chart to the cluster**: Once the Kubernetes cluster is up and running, you can deploy the Helm chart that describes your multi-tenant application setup.

I'll walk you through the process, step by step, with an explanation and a TypeScript program using Pulumi.

### Step 1: Creating a DigitalOcean Kubernetes Cluster

In this step, you'll use the `digitalocean.KubernetesCluster` resource to create a new Kubernetes cluster on DigitalOcean. You'll define the size, the region, the Kubernetes version, and other parameters required for the cluster configuration.

### Step 2: Deploying a Helm Chart

After the cluster is created, you'll use the `kubernetes.helm.v3.Chart` resource to deploy your Helm chart to the newfound cluster. This resource allows you to define the deployment specifics, such as the chart name, version, and any custom values you need to pass to your chart for the multi-tenant setup.

Below is a Pulumi program written in TypeScript that accomplishes both steps. It assumes that you've already set up `pulumi` with a DigitalOcean token and that `kubectl` has been set to use the appropriate context for interacting with Kubernetes clusters.

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

// Step 1: Create a DigitalOcean Kubernetes cluster
const cluster = new digitalocean.KubernetesCluster("do-cluster", {
    region: "nyc1",
    version: "1.21.5-do.0",
    nodePool: {
        name: "default",
        size: "s-2vcpu-2gb",
        nodeCount: 2,
    },
});

// The kubeconfig is a sensitive output that you should protect. It can be used to access your cluster,
// so do not check it into source control or display it in the console. For real projects, you should
// consider using Pulumi secrets to handle sensitive information.
const kubeconfig = cluster.kubeConfigs[0].rawConfig;

// Step 2: Deploy a multitenant Helm chart
const helmChart = new kubernetes.helm.v3.Chart("multi-tenant-chart", {
    chart: "my-multitenant-chart", // Replace with your chart name
    // Uncomment and modify these values if you have a specific repository or version
    // repo: "https://charts.example.com/",
    // version: "1.0.0",
    values: {
        // Insert your chart values here
    },
    // The namespace where the Helm chart will be installed
    namespace: "default",
}, { provider: new kubernetes.Provider("k8s-provider", { kubeconfig }) });

// Export the cluster's kubeconfig and Helm chart status
export const kubeconfigOutput = kubeconfig;
export const helmChartStatus = helmChart.status;

```

### Breaking Down the Program

- `digitalocean.KubernetesCluster`: This class creates a new Kubernetes cluster on DigitalOcean, which we've named `do-cluster`. You will need to specify the region, version of Kubernetes you'd like, and details about the node pool such as the size of the nodes and the number of nodes.

- `kubeconfig`: This is the configuration needed to communicate with your Kubernetes cluster using `kubectl`. It's an output from the `KubernetesCluster` resource.

- `kubernetes.helm.v3.Chart`: This class deploys a Helm chart to a Kubernetes cluster. We're deploying a chart named `my-multitenant-chart`, which you should replace with the actual name of your Helm chart. You can also specify a custom repository and version.

- `provider`: The Pulumi Kubernetes provider needs the kubeconfig to communicate with the cluster. We create a new provider instance that uses the kubeconfig we got from the `KubernetesCluster` instance.

Remember to replace `"my-multitenant-chart"` with the name of your actual Helm chart and to provide the necessary values that fit your multi-tenant application requirements.

By following the comments and adjusting parameters as per your use case, this program would set up the Kubernetes infrastructure and deploy your multi-tenant application onto it using Helm.