Deploy the stage helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

Deploying a Helm chart on a Kubernetes cluster involves a few steps. First, you need to provision a Kubernetes cluster where your applications can run. With Pulumi, you can define the infrastructure in a programmatic way using code. The `digitalocean.KubernetesCluster` resource from the Digital Ocean Pulumi provider allows you to create and manage a Kubernetes cluster on Digital Ocean.

Once you've got a Kubernetes cluster, you can use the `kubernetes.helm.v3.Chart` resource from the Kubernetes provider to deploy a Helm chart onto it. Helm is a package manager for Kubernetes that packages multiple Kubernetes resources into a single logical deployment unit called a Chart.

Here's a TypeScript program that demonstrates how to create a Kubernetes cluster on Digital Ocean and then deploy a Helm chart named "stage" to that cluster:

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

// Define a new Digital Ocean Kubernetes cluster
const cluster = new digitalocean.KubernetesCluster("do-cluster", {
    region: "nyc3",
    version: "latest",
    nodePool: {
        name: "default",
        size: "s-1vcpu-2gb",
        nodeCount: 2,
    },
});

// Export the Kubeconfig for the created cluster so you could use it to connect via `kubectl`
export const kubeconfig = cluster.kubeConfigs[0].rawConfig;

// Create a provider instance using the kubeconfig from the created cluster
const k8sProvider = new kubernetes.Provider("k8s-provider", {
    kubeconfig: kubeconfig,
});

// Deploy the stage Helm chart to the created cluster
const stageChart = new kubernetes.helm.v3.Chart("stage-chart", {
    chart: "stage",
    namespace: "default",
    version: "1.2.3", // specify the chart version you want to deploy
    fetchOpts: {
        repo: "https://charts.example.com/", // replace with your Helm chart's repository URL
    },
}, { provider: k8sProvider });

// Optional: Export some data about the Helm chart deployment
export const stageChartName = stageChart.metadata.name;
export const stageChartStatus = stageChart.status;
```

In this program:
- We create a Kubernetes cluster on Digital Ocean with one node pool consisting of two nodes of a specific size using the `digitalocean.KubernetesCluster` resource.
- The `kubeconfig` is a piece of data to connect to the Kubernetes cluster using `kubectl` or similar tools. We export it so you can use it outside of Pulumi if needed.
- We create an instance of the Kubernetes provider configured with the kubeconfig of the created cluster.
- We then deploy the Helm chart named "stage" using the `kubernetes.helm.v3.Chart` resource by specifying the chart name, namespace, and version, as well as providing the fetch options pointing to the chart's repository.

Remember to replace `"https://charts.example.com/"` with the actual URL of the Helm chart's repository and `"1.2.3"` with the version of the chart you want to deploy.

Finally, the optional export statements can provide handy information about the deployment, which you can see in the outputs after your Pulumi program executes.

Please note that to use this Pulumi program:
- You need to have Pulumi installed and set up with your desired state backend.
- The Digital Ocean token should be configured in your environment or Pulumi configuration.
- The appropriate Pulumi packages must be installed; you can add them using `npm` or `yarn` (`@pulumi/digitalocean` for the Digital Ocean Kubernetes Cluster and `@pulumi/kubernetes` for handling Kubernetes resources, including Helm charts).

When you execute this program with Pulumi, it will provision the infrastructure and deploy the Helm chart as defined in the code.

If you need further assistance on how to configure the Pulumi CLI, structure your Pulumi project, or on how to run Pulumi commands, please feel free to ask!