Deploy the cb-app-slack helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy a Helm chart on the Digital Ocean Kubernetes Service using Pulumi, you will typically go through these steps:

1. Provision a Kubernetes cluster in Digital Ocean.
2. Install the Helm chart on the cluster.

I will guide you step by step on how to write a Pulumi program in TypeScript to accomplish this.

### Creating a Kubernetes Cluster

First, you need to create a Kubernetes cluster in Digital Ocean. To do that, we will use the `digitalocean.KubernetesCluster` resource, which allows us to define a cluster with various configuration options like the region and node pool details.

### Installing the Helm Chart

After the cluster is provisioned, you will use Pulumi's Helm package to deploy the Helm chart to the cluster. Specifically, we'll deploy the `cb-app-slack` chart, which we'll assume is publicly available.

However, if you're using a private Helm repository or need specific values for your Helm release, you might need to customize your `Chart` resource further.

Now, let's translate these steps into code.

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

// 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-1vcpu-2gb",
        nodeCount: 2,
    },
});

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

// Deploy the cb-app-slack helm chart onto the Digital Ocean cluster
const cbAppSlackChart = new kubernetes.helm.v3.Chart("cb-app-slack", {
    chart: "cb-app-slack",
    // Assuming "cb-app-slack" chart is available in the default Helm repo.
    // If the chart is in a custom repository or requires a specific version,
    // you should provide the 'repo' and 'version' attributes accordingly.
    // Optionally, you can add 'values' to customize your Helm chart installation.
}, { provider: k8sProvider });

// Export the cluster's kubeconfig and the endpoint of the Helm chart service
export const kubeconfig = cluster.kubeConfigs[0].rawConfig;
export const serviceEndpoint = cbAppSlackChart.resources.apply(resources => {
    const service = resources["v1/Service::cb-app-slack"];
    return service ? service.status.loadBalancer.ingress[0].ip : undefined;
});
```

### Explanation:

- **Kubernetes Cluster**: We create a Kubernetes cluster using the `DigitalOcean.KubernetesCluster` class. We specify the region, Kubernetes version, and node pool configuration here. In this example, the cluster has a default node pool with two `s-1vcpu-2gb` Droplets.

- **Kubernetes Provider**: This is a Pulumi concept that allows us to communicate with a Kubernetes cluster. We use the kubeconfig from our newly created Digital Ocean Kubernetes cluster to instantiate the Kubernetes provider. It uses this kubeconfig to talk to the cluster and deploy resources.

- **Helm Chart**: The `kubernetes.helm.v3.Chart` class is used to deploy a Helm chart. The chart name provided is `cb-app-slack`, which we assume is present in the default Helm repository. If it's in a different repository or a specific version is needed, you can supply additional arguments like `repo` and `version`. You can also supply a `values` object to override default chart values.

- **Exports**: At the end of our program, we export the kubeconfig as well as the service endpoint (if available) to connect to the `cb-app-slack` service. The `serviceEndpoint` captures the IP address that can be used to access the deployed application, assuming the chart exposes a service with an external IP.

Remember to install the Pulumi DigitalOcean and Kubernetes SDKs before running this program:

```bash
npm install @pulumi/digitalocean @pulumi/kubernetes
```

After you have these packages installed, you can run this Pulumi program using the Pulumi CLI commands `pulumi up` to deploy the cluster and the app, and `pulumi destroy` when you want to clean up resources.

One more thing to note is the assumption here that the `cb-app-slack` chart is publicly available on a helm repository known to your Kubernetes cluster. If your chart is located elsewhere or requires authentication, you'll need to configure that accordingly in the chart resource.