Deploy the konnectivity-agent helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy the `konnectivity-agent` Helm chart on a DigitalOcean Kubernetes Service (DOKS) using Pulumi, you'll need to perform a series of steps. This involves setting up a Kubernetes cluster on DigitalOcean, and then using the Helm package management tool to install the `konnectivity-agent` chart on that cluster. Pulumi provides a set of APIs that can be used to manage these resources through code.

Here's an overview of the process:

1. **Set up the DigitalOcean Kubernetes Cluster**: Create a new Kubernetes cluster within Digital Ocean. For this, Pulumi provides a `KubernetesCluster` resource in the DigitalOcean provider.

2. **Install Helm Chart**: After setting up the cluster, we'll use the Helm provider in Pulumi to deploy a Helm chart. A Helm chart is a collection of pre-configured Kubernetes resources that can be deployed as a single unit. In this case, we want to deploy the `konnectivity-agent` chart.

Below is a TypeScript program that accomplishes the above tasks using Pulumi. Detailed explanations are provided in the comments.

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

// Step 1: Create a Kubernetes cluster on DigitalOcean.
const cluster = new digitalocean.KubernetesCluster("do-cluster", {
    // Define the name and region of the cluster:
    name: "konnectivity-cluster",
    region: "nyc3",

// Specify the version of Kubernetes to use, and the node pool configuration:
    version: "1.21.5-do.0",
    nodePool: {
        name: "default-pool",
        size: "s-2vcpu-2gb", // Size of each node in the node pool.
        nodeCount: 2,       // Number of nodes in the node pool.
    },
});

// Step 2: Deploy the konnectivity-agent helm chart on the created cluster.
const helmChart = new kubernetes.helm.v3.Chart("konnectivity-agent", {
    // Specify the namespace and repository information for the Helm chart:
    namespace: "default",
    chart: "konnectivity-agent",
    repo: "konnectivity-repo", // Replace with the actual repository where the chart is located.

// Pass in the configuration values for the Helm chart:
    values: {
        // Here, you need to specify the configuration options for the konnectivity-agent.
        // For example, you might need to set up service account tokens, the server address, etc.
        // Refer to the chart's documentation to find all available options.
        // Example configuration (you should replace these with real ones):
        // image: "us.gcr.io/k8s-artifacts-prod/kas-network-proxy/proxy-agent"
    },
}, { provider: new kubernetes.Provider("k8s-provider", { kubeconfig: cluster.kubeConfigs[0].rawConfig }) });

// Export the cluster's name and Kubeconfig
export const clusterName = cluster.name;
export const kubeConfig = cluster.kubeConfigs[0].rawConfig;

// To access the cluster, you can use the exported `kubeConfig` and authenticate with kubectl.
// Now you have a running instance of the konnectivity-agent in your DigitalOcean Kubernetes cluster.
```

In the code above:

- We create a cluster by instantiating a `KubernetesCluster` resource. The `name`, `region`, `version`, and `nodePool` properties configure the cluster's location, Kubernetes version, and the size and quantity of nodes in the default node pool.
- For the node pool size, `s-2vcpu-2gb` was chosen as an example. You might want to select a different size based on your requirements.
- The `KubernetesCluster` resource is a DigitalOcean-specific Pulumi resource, which allows you to create, update, and manage Kubernetes clusters on DigitalOcean.

Once the cluster is created, we proceed to deploy the `konnectivity-agent` Helm chart:

- `helm.v3.Chart` represents a Helm chart in Pulumi's Kubernetes provider.
- The `namespace` property specifies the Kubernetes namespace to deploy the chart in.
- The `chart` property specifies the name of the chart to deploy while the `repo` is where the chart can be fetched from.
- The `values` property is a key-value map specifying the configuration for the chart. As Helm charts can have various configurable parameters, this field will depend on the specifics of the `konnectivity-agent` chart you are using.

Finally, we export the cluster's name and Kubeconfig, which you can use to interact with your Kubernetes cluster using `kubectl` or other Kubernetes tooling.

Remember to replace `"konnectivity-repo"` under the `repo` property with the actual repository where the `konnectivity-agent` Helm chart is hosted. Additionally, you would need to configure the `values` for the Helm chart based on the konnectivity-agent chart's expected configuration parameters. These can typically be found in the chart's documentation or the `values.yaml` file that is packaged with the chart.

You will also need to make sure you have Pulumi set up and configured with the necessary cloud provider credentials for DigitalOcean.

To run this Pulumi program, you would navigate to the directory containing this `index.ts` file, and then execute:

```
pulumi up
```

This command will prompt Pulumi to execute the script, creating the resources as specified in the code. It will provide a preview of the changes and ask for confirmation before applying them.

Remember that you need the Pulumi CLI and Node.js installed to execute this program. You would also need to sign up for Pulumi and configure it to manage your DigitalOcean resources. The code assumes you have already configured this, along with the necessary access tokens for DigitalOcean.