Deploy the opentelemetry helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy the OpenTelemetry Helm chart on Digital Ocean Kubernetes Service using Pulumi, you'll need to perform a few steps:

1. Set up a Kubernetes cluster on Digital Ocean.
2. Use the Helm chart resource to deploy OpenTelemetry on the cluster.

### Setting up a Kubernetes cluster on Digital Ocean

First, we'll create a new Kubernetes cluster on Digital Ocean. Pulumi provides a resource specifically for this, called `digitalocean.KubernetesCluster`, which allows you to provision a new cluster.

To do this, you need to define the cluster configuration, such as the region, the node size, the number of nodes, and the Kubernetes version.

### Deploying the OpenTelemetry Helm chart

Once the cluster is up and running, you can deploy the OpenTelemetry Helm chart onto it using Pulumi's `kubernetes.helm.v3.Chart` resource. This resource allows you to manage Helm chart deployments in a declarative way.

You need the Helm chart name and repository URL to deploy it. For the OpenTelemetry Helm chart, you can find this information in the Helm repository where the chart is hosted.

Below is the Pulumi program written in TypeScript that accomplishes this. To run this program, you will need Node.js and Pulumi installed on your system, and you'll need to be logged in to both the Pulumi CLI and the Digital Ocean cloud provider.

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

// Create a Digital Ocean Kubernetes cluster
const cluster = new digitalocean.KubernetesCluster("opentelemetry-cluster", {
    // Region where the cluster will be created
    region: digitalocean.Regions.NYC3,
    // Define the node pool
    nodePool: {
        name: "worker-pool",
        size: digitalocean.DropletSlugs.DropletS2VCPU2GB,
        // Specify the number of nodes
        nodeCount: 2,
    },
    // Set the version of Kubernetes to use
    version: "latest", // You might want to pin this to a specific version
});

// Create a Kubernetes Provider that uses our new cluster
const k8sProvider = new kubernetes.Provider("k8s-provider", {
    kubeconfig: cluster.kubeConfigs[0].rawConfig,
});

// Define the values for the OpenTelemetry Helm chart
const openTelemetryValues = {
    // You can specify values to customize the OpenTelemetry deployment
    // For example, setting the backend to use, resource limits, and more
};

// Deploy the OpenTelemetry Helm chart
const openTelemetryChart = new kubernetes.helm.v3.Chart("opentelemetry", {
    chart: "opentelemetry",
    version: "1.0.0", // Replace with the desired version of the OpenTelemetry chart
    fetchOpts: {
        repo: "https://open-telemetry.github.io/opentelemetry-helm-charts",
    },
    values: openTelemetryValues,
}, { provider: k8sProvider });

// Export the cluster's kubeconfig and the OpenTelemetry service endpoint
export const kubeConfig = cluster.kubeConfigs[0].rawConfig;
export const openTelemetryServiceEndpoint = openTelemetryChart.getResourceProperty(
    "v1/Service", "opentelemetry-collector", "status");

```

### Program Explanation

- **Kubernetes Cluster**: The `digitalocean.KubernetesCluster` resource creates a new Kubernetes cluster in the specified region with a given node pool size and count. The `version` parameter can be set to "latest", or you might want to pin this to a specific version for more predictable behavior.

- **Kubernetes Provider**: The `kubernetes.Provider` resource is used to configure Pulumi to communicate with the new Kubernetes cluster created on Digital Ocean.

- **Helm Chart**: The `kubernetes.helm.v3.Chart` resource is used to deploy the OpenTelemetry Helm chart onto the Kubernetes cluster. The `chart` parameter specifies the name of the chart to deploy, and `fetchOpts` is used to provide the URL of the Helm chart repository.

- **Values**: The `values` field within the Helm chart resource allows you to customize the deployment by setting values supported by the OpenTelemetry Helm chart.

- **Exports**: The `kubeConfig` export allows you to easily access the `kubeconfig` content of the cluster so that you can connect to your Kubernetes cluster using tools like `kubectl`. The `openTelemetryServiceEndpoint` export could be used to retrieve the address at which the OpenTelemetry service is exposed.

After you have this code in a `.ts` file, run `pulumi up` to provision the resources. The command line will display the changes that will be made and ask for confirmation before provisioning the resources on Digital Ocean. Once confirmed, Pulumi will set up the Kubernetes cluster and deploy OpenTelemetry via the Helm chart.