Deploy the backend helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy a backend Helm chart on Digital Ocean Kubernetes Service, we will need to complete a few steps. First, we'll provision a Kubernetes cluster using DigitalOcean's managed Kubernetes service (DOKS). After that, we'll deploy the Helm chart onto our cluster.

Here's the plan:
1. Create a new DigitalOcean Kubernetes cluster.
2. Configure Pulumi to use the DigitalOcean provider.
3. Deploy the Helm chart onto the Kubernetes cluster.

I'll guide you through the code necessary to complete each of these steps.

First, make sure you have Pulumi and the DigitalOcean CLI installed, and you have configured your DigitalOcean token. Pulumi will use the token to authenticate with DigitalOcean's API.

Now, let's start with the code.

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

// Create a DigitalOcean Kubernetes cluster.
const cluster = new digitalocean.KubernetesCluster("do-k8s-cluster", {
    region: "nyc1", // this specifies which region to create our cluster in, you can change this as needed
    version: "latest", // using the 'latest' keyword ensures that we get the latest stable version of Kubernetes
    nodePool: {
        name: "default-pool",
        size: "s-2vcpu-2gb", // size of the Droplet for each worker node in our cluster
        nodeCount: 2 // number of worker nodes in this pool
    }
});

// Use the DigitalOcean Kubernetes cluster.
const kubeconfig = cluster.kubeConfigs[0].rawConfig;

// Create a provider to apply Helm charts to the DigitalOcean cluster.
const k8sProvider = new kubernetes.Provider("do-k8s-provider", {
    kubeconfig
});

// Define the backend Helm chart repository info (change this to fit your chart details).
const backendChart = new kubernetes.helm.v3.Chart("backend-chart", { 
    // Assuming your Helm chart is in a public repository, specify its URL here.
    // If it's in a private repository, you would need to include more details 
    // like a `fetchOpts` object with authentication details.
    chart: "your-backend-chart-name",
    version: "1.0.0", // the version of the chart to deploy
    fetchOpts: {
        repo: "https://charts.example.com/", // set this to the actual repository URL
    },
}, { provider: k8sProvider });

// Export the cluster's kubeconfig.
export const kubeConfigOutput = kubeconfig;
```

Explanation:
- We import the required Pulumi packages for DigitalOcean and Kubernetes.
- We create a DigitalOcean Kubernetes cluster by specifying details like region, Kubernetes version, and node pool size.
- We set up a `kubeconfig` variable that will hold the necessary information to connect to the cluster, authenticating the Pulumi Kubernetes provider.
- We initialize a Pulumi Kubernetes Provider that will use the `kubeconfig` from our DOKS cluster.
- We deploy our backend Helm chart using a `Chart` resource, which refers to the Helm chart we want to deploy and the version we want to use. Here you need to provide the actual chart name and repository URL.
- Lastly, we export the `kubeConfigOutput` variable so you can easily retrieve the kubeconfig for your newly-created cluster if needed.

Make sure to replace `"your-backend-chart-name"` with the actual name of your backend Helm chart and the correct repository URL in the `fetchOpts`.

After deploying this code with `pulumi up`, the DigitalOcean Kubernetes cluster will be provisioned, and then the Helm chart will be deployed to that cluster.