Deploy the keycloak-umbrella helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy the Keycloak umbrella Helm chart on the Digital Ocean Kubernetes Service (DOKS), we will use Pulumi to provision a DigitalOcean Kubernetes cluster and then deploy the Keycloak Helm chart to it.

### Overview
In the following program:
1. We create a Kubernetes cluster in DigitalOcean.
2. We install the Keycloak umbrella Helm chart onto the cluster.

Here are the main steps that our Pulumi TypeScript program will include:

1. **Create a Kubernetes cluster:** We use the `digitalocean.KubernetesCluster` Pulumi resource to create a Kubernetes cluster in DigitalOcean. You need to provide details such as the region, version, and node specifications.

2. **Deploy the Helm Chart:** Once the Kubernetes cluster is up and running, we use the `kubernetes.helm.v3.Chart` resource to deploy the Keycloak umbrella Helm chart. The Helm chart is a collection of pre-configured Kubernetes resources that can be deployed as a single unit.

### Prerequisites
Before you run this program, you need to make sure that you have:
- Set up Pulumi and the Pulumi CLI
- Configured your DigitalOcean token
- An existing DigitalOcean project (optional)

### The Pulumi Program

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

// The config object allows us to get configuration from our environment, such as the DigitalOcean region or the Kubernetes version.
const config = new pulumi.Config();

// We define the base configuration for our Kubernetes cluster.
const clusterConfig = {
    region: config.get('doRegion') || 'nyc3', // For example 'nyc3'. It's advisable to use a region close to you or your users.
    version: config.get('doK8sVersion') || '1.21.5-do.0', // Specify the Kubernetes version
    nodePool: {
        name: "default",
        size: "s-2vcpu-2gb", // This is the smallest size available, choose a size that fits your needs.
        nodeCount: 2, // We start with 2 nodes in our node pool.
    },
};

// Creating a Kubernetes cluster in DigitalOcean.
const cluster = new digitalocean.KubernetesCluster('do-cluster', clusterConfig);

// Get the Kubeconfig from the created Kubernetes cluster to connect and access it.
const kubeconfig = cluster.kubeConfigs[0].rawConfig;

// We create a Kubernetes provider instance using the kubeconfig from our just created DigitalOcean cluster.
const k8sProvider = new kubernetes.Provider('do-k8s', {
    kubeconfig: kubeconfig,
});

// Define the Keycloak Helm chart.
const keycloakChart = new kubernetes.helm.v3.Chart('keycloak-umbrella', {
    chart: 'keycloak',
    fetchOpts:{
        repo: 'https://codecentric.github.io/helm-charts', // The repository where the Keycloak Helm chart is located.
    },
    // You can specify additional configurations depending on your requirements.
    // For example, you can customize the Keycloak configuration, persistence, resource requirements, etc.
}, { provider: k8sProvider });

// Export the kubeconfig and Keycloak service endpoint to access Keycloak after it is deployed.
export const kubeconfigOutput = cluster.kubeConfigs[0].rawConfig;
export const keycloakEndpoint = keycloakChart.getResourceProperty('v1/Service', 'keycloak-http', 'status');

// The endpoint variable will contain the IP or DNS name for Keycloak, which you can use to access the Keycloak interface.
```

### Understanding the Program

- We begin by importing the necessary modules from the Pulumi library.
- We then define a configuration object, which lets us pull in configuration options, such as the region we want our cluster in.
- We specify the details of our Kubernetes cluster, including the region, Kubernetes version, and details about our node pool (the nodes that will run our Kubernetes workloads).
- We create a Kubernetes cluster using the `digitalocean.KubernetesCluster` resource type.
- Once the cluster is created, we access the kubeconfig to interact with the Kubernetes cluster using Pulumi's Kubernetes provider.
- We deploy the Keycloak Helm chart using the `Chart` resource from the `@pulumi/kubernetes` module, which allows us to deploy packaged applications on our Kubernetes cluster.
- We export the kubeconfig which will be used to access our Kubernetes cluster and the Keycloak endpoint to connect to the Keycloak application once it is deployed.

### Running the Program

To run this Pulumi program, save the code into a file, such as `index.ts`. Then, run the following commands:

```bash
pulumi up
```

This command will provision the resources defined in your program on DigitalOcean. It will output the status of the resource creation process. Once the process is complete, your terminal will display the exported Keycloak endpoint.

You can then access Keycloak using that endpoint URL in your web browser.

When you no longer need the resources, you can remove them by running `pulumi destroy`. This will tear down the resources created by Pulumi, avoiding further charges.