Deploy the another-ldap-auth helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy the `another-ldap-auth` Helm chart on Digital Ocean Kubernetes Service (DOKS), we will be using the Pulumi TypeScript programming language. The process involves two major steps:

1. Provisioning the Digital Ocean Kubernetes Service cluster.
2. Deploying the Helm chart to the cluster.

We will use two Pulumi resources to accomplish this:

- `digitalocean.KubernetesCluster`: This resource manages a Kubernetes cluster on Digital Ocean. [Documentation](https://www.pulumi.com/registry/packages/digitalocean/api-docs/kubernetescluster/)
- `kubernetes.helm.v3.Chart`: This is used to deploy the Helm chart onto your Kubernetes cluster. [Documentation](https://www.pulumi.com/registry/packages/kubernetes/api-docs/helm/v3/chart/)

Make sure to have Pulumi and the required providers installed, and your Digital Ocean access token configured for Pulumi before running the program.

Here is the TypeScript program that does both:

```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: "latest", // You can specify the exact version of Kubernetes.
    nodePool: {
        name: "default",
        size: "s-1vcpu-2gb", // Select the most appropriate node size for your workload.
        nodeCount: 2, // Define the number of nodes in the node pool.
    },
});

// Step 2: Deploy the Helm chart to the cluster.
// Export the Kubeconfig of the cluster to connect to Kubernetes.
const kubeconfig = cluster.kubeConfigs[0].rawConfig;

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

// Deploy the `another-ldap-auth` Helm Chart into the cluster.
const ldapAuthChart = new k8s.helm.v3.Chart("another-ldap-auth", {
    chart: "another-ldap-auth",
    // Specify any values needed for the Helm chart.
    values: { /* ... */ },
    // You might need to specify repository opts if the chart is not in the default Helm repo.
    repositoryOpts: { 
        repo: "http://charts.example.com/", // Replace with the chart's repository URL.
    },
}, { provider: k8sProvider });

// Exports
export const clusterName = cluster.name;
export const clusterKubeconfig = kubeconfig;
export const chartName = ldapAuthChart.metadata.apply(metadata => metadata.name);
```

**Explanation:**

- We start by importing the necessary modules from Pulumi for Digital Ocean and Kubernetes.
- Using the `digitalocean.KubernetesCluster` resource, we create a new Kubernetes cluster. We set the region to `nyc1`, specify that we want to use the latest available version of Kubernetes, and configure the node pool with the desired size and node count.
- With the kubeconfig of the cluster, we instantiate a Pulumi Kubernetes Provider to interact with the cluster. We need this provider to specify which cluster the Helm chart should be installed on.
- Next, we deploy the Helm chart using the `kubernetes.helm.v3.Chart` resource. We specify the name of the Helm chart and any default values it might require. Here you need to replace the placeholder for repository options with the actual chart's repository URL, and fill in any custom values your `another-ldap-auth` chart requires.
- Finally, we export the cluster name, kubeconfig, and deployed chart name. These exports make it easy to identify and interact with your deployed resources.

Before running this program, ensure you have set up your Pulumi stack with the required configurations, and you are logged in to your Pulumi account. Then, run the following commands:

```sh
pulumi up
```

This command will preview the changes and prompt you for confirmation before applying them. After your confirmation, Pulumi will provision the resources as defined in your program, and output the exported variables upon completion.