Deploy the dynamo-db helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy the DynamoDB helm chart on the Digital Ocean Kubernetes Service using Pulumi, we will perform several steps:

1. **Create a Digital Ocean Kubernetes Cluster**: This will be the cluster where your applications will be deployed.
2. **Deploy a Helm Chart**: Leveraging the Pulumi resource `kubernetes.helm.sh/v3.Chart` to deploy the DynamoDB helm chart to your Digital Ocean Kubernetes cluster.

Before you begin, ensure you have the following prerequisites:

- Pulumi CLI installed and configured with a new or existing Pulumi project.
- Access to your Digital Ocean account configured with the necessary credentials.
- `kubectl` installed to interact with the Digital Ocean Kubernetes cluster.
- Access to the Helm repository that contains the "dynamo-db" chart. Note that as of my knowledge cut-off in early 2023, there is not an official "dynamo-db" chart, so you would need to specify the repository URL if you are using a custom or third-party chart.

Let's start with the Pulumi program to accomplish the deployment:

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

// Step 1: Create a Digital Ocean Kubernetes cluster
const cluster = new digitalocean.KubernetesCluster("do-cluster", {
    region: "nyc1", // Choose the region that is best for you
    version: "latest", // Specify the Kubernetes version
    nodePool: {
        name: "default",
        size: "s-2vcpu-2gb", // Choose the node size that is best for you
        nodeCount: 2, // Number of nodes in the node pool
    },
});

// Export the cluster's kubeconfig
export const kubeconfig = cluster.kubeConfigs[0].rawConfig;
// Use the kubeconfig to create a provider
const clusterProvider = new kubernetes.Provider("do-k8s", {
    kubeconfig: kubeconfig,
});

// Step 2: Deploy the helm chart for DynamoDB
const dynamoDbChart = new kubernetes.helm.sh.v3.Chart("dynamo-db", {
    chart: "dynamo-db",
    // Replace with the URL of the Helm repository that contains the dynamo-db chart
    fetchOpts: {
        repo: "https://charts.example.com/",
    },
}, { provider: clusterProvider });

// Deploying a specific version of the chart or custom values.yaml
// would require additional optional parameters within the Chart resource above
// such as `version` and `values`

// Step 3 (optional): Export the application URL if the Helm chart provides it
const dynamoDbService = dynamoDbChart.getResource('v1/Service', 'dynamo-db');
export const appUrl = dynamoDbService.status.loadBalancer.ingress[0].ip;
```

Here is what each part of the code does:

1. We import necessary Pulumi packages for Digital Ocean and Kubernetes.
2. We create a Digital Ocean Kubernetes cluster in the specified region with the node size and count using the `digitalocean.KubernetesCluster` resource.
3. The `kubeconfig` output from the cluster creation is used to set up the Kubernetes provider for Pulumi, which links our deployment to the correct cluster.
4. We then declare a `Chart` resource to deploy the DynamoDB helm chart. For this example, you would need the URL of the helm repository hosting the DynamoDB chart.
5. Optionally, if the deployed service exposes an external IP, we export the `appUrl` that can be used to access the chart's deployed service.

Please remember that this code assumes the existence of a helm chart for DynamoDB, which may not actually be available. You need to replace `https://charts.example.com/` with the actual repository containing the DynamoDB chart or with the chart for the database service you wish to deploy.