Deploy the s3manager helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

Deploying a Helm chart on a Kubernetes cluster generally involves two main steps:

1. Setting up and configuring the Kubernetes cluster.
2. Deploying the Helm chart.

In this case, we'll first create a Digital Ocean Kubernetes (DOKS) cluster and then deploy the `s3manager` Helm chart.

To manage Digital Ocean resources through Pulumi, we'll need to use the Digital Ocean Pulumi provider. This provider allows us to create and manage Digital Ocean Kubernetes clusters quite easily.

For deploying Helm charts, the `kubernetes` Pulumi provider can be used. It includes a `Chart` resource which can be utilized to specify and deploy a Helm chart within a Kubernetes cluster.

Below is a Pulumi TypeScript program that does the following:

- **DigitalOcean Kubernetes Cluster:** Sets up a Digital Ocean Kubernetes Cluster.
- **Helm Chart Deployment:** Deploys the `s3manager` Helm chart to the created Kubernetes cluster.

Make sure you have Pulumi installed, along with the necessary Pulumi providers, which include `digitalocean` and `kubernetes`. Additionally, ensure you have Helm installed if you need to customize your Helm charts beyond default configurations.

Here's the Pulumi program:

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

// Step 1: Create a Digital Ocean Kubernetes Cluster.
const cluster = new digitalocean.KubernetesCluster("do-cluster", {
    // Define the region, size, and settings for the DO Kubernetes cluster.
    region: "nyc3",
    version: "1.21.5-do.0",
    nodePool: {
        name: "default",
        size: "s-2vcpu-2gb",
        nodeCount: 2,
    },
});

// Step 2: Deploy the `s3manager` Helm chart to the created Kubernetes cluster.
// Configure the Kubernetes provider to use the kubeconfig from the generated DO cluster.
const k8sProvider = new k8s.Provider("k8s-provider", {
    kubeconfig: cluster.kubeConfigs[0].rawConfig,
});

// Use the `kubernetes.helm.v3.Chart` class to deploy the Helm chart.
const s3managerChart = new k8s.helm.v3.Chart("s3manager-chart", {
    // Specify the chart, version, and repository if it's not a stable chart.
    chart: "s3manager",
    version: "1.0.0", // Replace with the actual chart version you wish to deploy.
    // Assuming `s3manager` is the name of the chart in the Helm repository.
    // If the `s3manager` chart is hosted in a specific Helm repository, specify
    // the repository using the `repo` argument.
    // If you have custom values you want to override, specify them in `values`.
}, { provider: k8sProvider });

// Export the public URL for the s3manager service.
// Replace `service` with the appropriate service name that `s3manager` provides.
// You can use `kubectl get svc` to get the list of services after deploying the chart.
export const s3managerUrl = s3managerChart.getResource("v1/Service", "s3manager-service")
    .status.apply(status => `http://${status.loadBalancer.ingress[0].ip}`);

```

Explanation:

- The `digitalocean.KubernetesCluster` resource creates a new Kubernetes cluster in your Digital Ocean account. You need to specify the region, Kubernetes version, and details about the node pool (size and count).
  
- The `k8s.Provider` is a Pulumi resource that is used to interact with your Kubernetes cluster. It uses the kubeconfig data from the DigitalOcean cluster to authenticate with the Kubernetes API server.

- The `k8s.helm.v3.Chart` resource is used to deploy Helm charts on the Kubernetes cluster. In this case, we're deploying a chart named `s3manager`. You would need to replace the `chart` and `version` parameters with the actual chart information you want to deploy. Also, if this chart is part of a private or custom Helm repository, you'll need to specify that in the `repo` optional parameter.

- Finally, the exposed URL of the `s3manager` service is exported. This assumes that the Helm chart exposes a service named `s3manager-service`, which will need to be replaced with the actual service name. The provided URL can be used to interact with the deployed application on the cluster.

To use this program, simply save it to a TypeScript (.ts) file, run `pulumi up`, and follow the prompts from the Pulumi CLI to deploy your Kubernetes cluster and `s3manager` service to Digital Ocean.