Deploy the istio-helloworld helm chart on Linode Kubernetes Engine

Question

Pulumi · Accepted Answer

To deploy the Istio `helloworld` Helm chart on Linode Kubernetes Engine using Pulumi, you'll need to follow these steps:

1. **Set up a Linode Kubernetes Engine (LKE) cluster**: You first need to create a Kubernetes cluster in Linode where your application will run.

2. **Install Istio on your cluster**: You may need to install Istio service mesh on your LKE cluster before deploying the `helloworld` application. This often involves applying Istio manifests or using the Istio operator.

3. **Deploy the `helloworld` Helm chart**: After you have Istio running, you will deploy the `helloworld` Helm chart. This will set up the sample application within the Istio service mesh.

Below is a Pulumi program that performs these tasks. This example assumes you have Linode provider configured and the necessary Helm chart details for `helloworld` are known (e.g., chart version, repository).

In this program, we will use the `@pulumi/linode`, `@pulumi/kubernetes`, and `@pulumi/kubernetes/helm/v3` packages. The `@pulumi/linode` package allows us to manage Linode resources, including Kubernetes clusters. The `@pulumi/kubernetes` package helps us interact with Kubernetes clusters, apply manifests, or set up configurations. The `@pulumi/kubernetes/helm/v3` package is specifically utilized to deploy Helm charts to our Kubernetes cluster.

Here is the TypeScript code for Pulumi:

```typescript
import * as linode from "@pulumi/linode";
import * as k8s from "@pulumi/kubernetes";
import * as helm from "@pulumi/kubernetes/helm/v3";

// Step 1: Create a Linode Kubernetes Engine cluster
const lkeCluster = new linode.LkeCluster("my-lke-cluster", {
    label: "my-lke-cluster",
    region: "us-central",
    k8sVersion: "1.20",
    tags: ["pulumi"],
    pool: {
        type: "g6-standard-2",
        count: 3,
    },
});

// Step 2: Set up the Kubeconfig for the LKE cluster
const kubeconfig = lkeCluster.kubeconfig.apply(JSON.stringify);

// Step 3: Use Pulumi Kubernetes provider to interact with the LKE cluster
const k8sProvider = new k8s.Provider("k8s-provider", {
    kubeconfig: kubeconfig,
});

// Step 4: Install the Istio `helloworld` Helm chart
const helloworldChart = new helm.Chart("istio-helloworld", {
    chart: "helloworld",
    version: "1.0.0", // specify the correct chart version
    fetchOpts: {
        repo: "https://istio-release.storage.googleapis.com/charts", // specify the correct Helm repo URL
    },
    namespace: "default",
}, { provider: k8sProvider });

// Export the LKE cluster's Kubeconfig and Helm chart resources
export const clusterKubeconfig = kubeconfig;
export const helloworldChartResources = helloworldChart.resources;
```

This Pulumi program will create a new Linode Kubernetes Engine cluster, configure the Kubernetes provider to interact with the cluster, and then deploy the Istio `helloworld` Helm chart to that cluster. The `export` statements at the end of the program will output the `kubeconfig` for the LKE cluster and details of the resources created by the Helm chart.

Remember to replace the `version` and `repo` values in the `helloworldChart` declaration with the actual version number and Helm repository URL that hosts the Istio `helloworld` chart.

After writing this program, you would typically run `pulumi up` to execute it with Pulumi. This will provision the cluster and deploy the Helm chart as described in the code.