Deploy the istio-cni helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy the Istio CNI Helm Chart on DigitalOcean Kubernetes Service using Pulumi, you will need to use the `digitalocean.KubernetesCluster` resource to create a Kubernetes cluster, and then deploy the chart with the `kubernetes.helm.v3.Chart` resource within a Pulumi program.

I will guide you through the process in TypeScript:

1. **Create a Kubernetes Cluster on DigitalOcean**: We'll start by defining a Kubernetes cluster using the `digitalocean.KubernetesCluster` resource. You need to specify parameters like the region, version, and node pool details.
   
2. **Install Istio CNI Helm Chart**: Once the cluster is created, we'll deploy the Istio CNI using the `kubernetes.helm.v3.Chart` resource. This allows you to declare Helm charts as part of your infrastructure in a declarative way.

Here is a Pulumi program in TypeScript that demonstrates these steps:

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

// Step 1: Create a Kubernetes cluster on DigitalOcean.
// Make sure to replace the placeholder values with real values or configuration references.
const cluster = new digitalocean.KubernetesCluster("do-cluster", {
    region: "nyc1", // Specify the DigitalOcean region
    version: "1.21.5-do.0", // Specify the Kubernetes version
    nodePool: {
        name: "default-pool",
        size: "s-1vcpu-2gb", // Specify the size of the droplets
        nodeCount: 2, // Specify the number of nodes in the node pool
    },
});

// Step 2: Deploy the Istio CNI Helm chart into the Kubernetes cluster.
const kubeConfig = cluster.kubeConfigs[0].rawConfig;
const k8sProvider = new kubernetes.Provider("k8s-provider", {
    kubeconfig: kubeConfig,
});

const istioCniChart = new kubernetes.helm.v3.Chart("istio-cni", {
    chart: "istio-cni",
    version: "1.11.0", // Replace with the specific version of Istio CNI you want to install
    namespace: "kube-system", // Typically Istio is installed in the kube-system namespace
    fetchOpts: {
        repo: "https://istio-release.storage.googleapis.com/charts",
    },
}, { provider: k8sProvider });

// Use the following command in your CLI to get the kubeconfig for the created cluster:
// pulumi stack output kubeConfig
export const kubeConfigOutput = cluster.kubeConfigs[0].rawConfig;
```

Here's what each part of the program does:

1. **Importing Libraries**: We import the required Pulumi libraries for interacting with the Kubernetes cluster and deploying Helm charts.

2. **Creating the Cluster**: We define a `digitalocean.KubernetesCluster` resource. You should replace the region, version, and the size of the droplets with appropriate values according to your requirements.

3. **Setting Up Kubernetes Provider**: After the cluster is created, we need the Kubeconfig to interact with it programmatically. We create a new instance of `kubernetes.Provider`, passing it the Kubeconfig sourced from our recently created cluster.

4. **Deploying the Istio CNI Chart**: Using the `kubernetes.helm.v3.Chart` resource, we specify the Helm chart we want to deploy, its version, and the namespace. The `fetchOpts` parameter is used to define the repository from where to fetch the chart.

5. **Exporting Output**: Finally, we export the `kubeConfig` so that you can use it with `kubectl` directly from the command line.

To run the program:

1. Set up a Pulumi account and install the CLI from the [Pulumi website](https://www.pulumi.com/docs/get-started/install/).
2. Configure Pulumi to use DigitalOcean by setting up the token [using Pulumi's configuration](https://www.pulumi.com/docs/intro/cloud-providers/digitalocean/setup/).
3. Create a new directory, initialize a Pulumi program using `pulumi new typescript`, and then replace the contents of `index.ts` with the above program.
4. Run `pulumi up` to preview and deploy the changes.

Remember to replace placeholder values such as regions, droplet sizes, and Kubernetes versions with the actual values you plan to use. Additionally, if you want to specify more advanced configurations for the Istio CNI Helm chart, you might want to set the `values` property in the chart resource to tailor it to your exact requirements.