Deploy the geoip-api helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

Deploying a Helm chart on a Kubernetes cluster hosted on Digital Ocean is a multi-step process. First, you need to create a Kubernetes cluster on Digital Ocean. Once the cluster is up and running, you can deploy the Helm chart to this cluster.

Below is a detailed explanation of the Pulumi code needed to achieve this:

1. **Setup Digital Ocean Kubernetes Cluster**: We start by creating a Kubernetes cluster in Digital Ocean using the `digitalocean.KubernetesCluster` class. You will need to specify the region, the size of the nodes, and the number of nodes. The cluster will have a name and a tag, for easier management.

2. **Install Helm Chart**: After the cluster is ready, we can deploy the Helm chart by creating a resource of type `kubernetes.helm.v3.Chart`. This chart requires a Kubernetes provider that is configured to connect to the Digital Ocean Kubernetes cluster. Pulumi will automatically fetch the kubeconfig file once the cluster is created.

3. **Export Outputs**: Outputs such as the Kubernetes cluster endpoint and the Helm chart deployment status will be exported. This information is crucial to verify that the resources were created and are running as expected.

Here's the TypeScript program that follows the above steps:

```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', {
  region: 'nyc1',
  version: '1.21.5-do.0',
  nodePool: {
    name: 'default',
    size: 's-2vcpu-2gb',
    nodeCount: 2,
    tags: ['pulumi-cluster'],
  },
});

// Step 2: Deploy the geoip-api helm chart
// Define the geoip-api Helm chart. This assumes the Helm chart is available in a public repository.
const geoipApiChart = new k8s.helm.v3.Chart('geoip-api', {
  chart: 'geoip-api',
  version: '0.1.0', // Replace with the specific chart version you want to deploy
  fetchOpts: {
    repo: 'https://charts.example.com/' // Replace with the URL of the chart repository
  },
}, { provider: new k8s.Provider('do-k8s', { kubeconfig: cluster.kubeConfigs[0].rawConfig }) });

// Step 3: Export the cluster endpoint and chart deployment status
export const kubeClusterEndpoint = cluster.endpoint;
export const geoipApiChartStatus = geoipApiChart.status;

// Usage:
// After running `pulumi up`, the Kubernetes cluster will be provisioned followed by the installation of the geoip-api Helm chart.
```

The `cluster` constant represents the Kubernetes cluster resource. The `region` can be set to any Digital Ocean region you prefer. The `version` should be the Kubernetes version to use (Digital Ocean supports specific versions). The `nodePool` specifies the configurations for the node pool within your Kubernetes cluster.

The `geoipApiChart` is the representation of the Helm chart you wish to deploy. Replace `'https://charts.example.com/'` with the actual URL of the Helm chart's repository. Make sure you also specify the correct `chart` and `version` values to match the geoip-api chart you wish to deploy.

Finally, the exports allow you to access the Kubernetes endpoint and the Helm chart status outside of Pulumi, for instance, to configure continuous deployment or for monitoring purposes.

Run the above Pulumi program with the Pulumi CLI by placing the code in an `index.ts` file, then execute `pulumi up` to create the cluster and deploy the chart. Make sure to install the required packages with `npm` or `yarn` before running the program.