Deploy the servicemesh-istio-resource helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy the `servicemesh-istio-resource` Helm chart on a DigitalOcean Kubernetes Service (DOKS) cluster using Pulumi with TypeScript, we'll go through several steps:

1. **Set up the DOKS cluster:** We will define a `KubernetesCluster` resource from the `digitalocean` provider. This represents the Kubernetes cluster itself.
   
2. **Configure k8s provider to use DOKS kubeconfig:** We'll set up a Kubernetes provider that uses the kubeconfig from the created DOKS cluster to ensure that subsequent resources are deployed to that cluster.

3. **Deploy Helm chart using the k8s provider:** We will create a Helm Chart resource from the `kubernetes` provider, pointing it to the `servicemesh-istio-resource`. We'll assume this chart is publicly available; if it's not, additional configuration might be needed for the chart repository credentials.

Let's look at how this translates into a Pulumi program:

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

// Step 1: Create a DigitalOcean Kubernetes cluster
const cluster = new digitalocean.KubernetesCluster("do-cluster", {
    // Provide the region where the cluster will be located
    region: digitalocean.Regions.NYC1, 
    // Specify the version of Kubernetes to deploy
    version: "latest",
    // Configure the node pool for the cluster
    nodePool: {
        size: digitalocean.DropletSlugs.DropletS2VCPU2GB,
        name: "default-pool",
        nodeCount: 2,
    },
});

// Step 2: Configure a Kubernetes provider
const k8sProvider = new kubernetes.Provider("k8s-provider", {
    kubeconfig: cluster.kubeConfigs[0].rawConfig,
});

// Step 3: Deploy the Helm chart to the DOKS cluster
const istio = new kubernetes.helm.v3.Chart("istio", {
    // Assuming 'servicemesh-istio-resource' is the name of the Helm chart
    chart: "servicemesh-istio-resource",
    // Specify the Helm repo URL if it's not in the default Helm repo
    fetchOpts: { repo: "https://your-helm-chart-repo.com" },
    // If you have custom values, provide them here
    values: {
        // Custom values for the Helm chart
    },
}, { provider: k8sProvider });

// Export the cluster's kubeconfig and the service endpoint
export const kubeconfig = cluster.kubeConfigs[0].rawConfig;
export const istioEndpoint = istio.getResource("v1/Service", "istio-ingressgateway").status.loadBalancer.ingress[0].ip;
```
Here is what we're doing in the code above:

- We start by importing the necessary modules from Pulumi's `digitalocean` and `kubernetes` packages. These will help us define and manage resources on DigitalOcean and Kubernetes.
  
- We then create a new DigitalOcean Kubernetes cluster by invoking `digitalocean.KubernetesCluster`. This takes several parameters, such as the desired region for the cluster, the Kubernetes version, and the configuration of the node pool, which includes the size and count of nodes.

- Once the cluster is created, we set up a Kubernetes provider configured with the kubeconfig from the DOKS cluster. This provider will be used to interact with the cluster and deploy applications to it.

- Finally, we deploy the `servicemesh-istio-resource` Helm chart by creating an instance of `kubernetes.helm.v3.Chart`. We're assuming that the Helm chart name and repository URL are known. The `values` object is where you can pass any custom configuration required for the Istio Service Mesh installation.
  
- The `kubeconfig` is exported so you can access it outside of Pulumi, for instance, to use `kubectl` to interact with the cluster. We also make an educated guess that the Istio Service Mesh exposes an ingress service named `istio-ingressgateway` and export its IP address.

Please make sure to replace the chart name and repository URL with accurate information for Istio or the specific service mesh Helm chart you are using. If your Helm chart needs specific versions or setup, make sure to specify that in the `version` argument and `values` property.

Save the file with a `.ts` extension and deploy with the `pulumi up` command. Pulumi will perform these operations, providing a detailed preview and summary of the resources created. If this is what you expect, you can proceed with the actual deployment by confirming the prompt.