Deploy the twampy helm chart on Linode Kubernetes Engine

Question

Pulumi · Accepted Answer

To deploy the `twampy` Helm Chart on Linode Kubernetes Engine (LKE) using Pulumi, we will take the following steps:

1. **Set up the Linode Kubernetes Engine Cluster**: We need to create a Kubernetes cluster on Linode if one does not already exist. Pulumi provides resources for creating and managing LKE clusters.

2. **Install the Helm Chart**: We will use the `kubernetes` package provided by Pulumi to deploy Helm charts to a Kubernetes cluster. In this case, we will deploy the `twampy` Helm Chart.

Here's a detailed TypeScript program to accomplish the deployment:

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

// Create a Linode Kubernetes Engine (LKE) cluster
const clusterName = "twampy-cluster";
const lkeCluster = new linode.LkeCluster(clusterName, {
    // Choose the region where you want to deploy your cluster
    region: "us-central",
    // Define the type of Linode instances for the Kubernetes nodes
    nodePools: [
        {
            type: "g6-standard-2", // example instance type, choose one that suits your workload
            count: 3, // number of nodes in the node pool
        },
    ],
    // Specify the Kubernetes version
    k8sVersion: "1.21",
    // Optionally, you can label your cluster for better management
    tags: ["twampy-application"],
});

// Set up a Kubernetes provider to interact with the LKE cluster
const k8sProvider = new kubernetes.Provider("k8s-provider", {
    kubeconfig: lkeCluster.kubeconfigRaw,
});

// Deploy the twampy Helm chart to the LKE cluster
const twampyChart = new kubernetes.helm.v3.Chart("twampy-chart", {
    // Replace with the specific chart name or URL
    chart: "twampy",
    // Specify the Helm repository, replace with the Helm repo URL for twampy or its name if it's a known repository
    fetchOpts: {
        repo: "http://helm-repo-url/",
    },
    // If twampy requires any specific values, specify them here
    values: {
        // For example, replace these with actual values for the twampy Helm chart
        serviceType: "LoadBalancer",
        replicaCount: 1,
    },
    // Namespace where the Helm chart will be deployed
    namespace: "default",
}, { provider: k8sProvider });

// Export the cluster's kubeconfig and the public endpoint to access twampy if available
export const kubeconfig = lkeCluster.kubeconfigRaw;
export const twampyEndpoint = twampyChart.getResourceProperty("v1/Service", "twampy-service", "status").apply(status => status.loadBalancer.ingress[0].ip);
```

### Description of the Program

- We begin by importing the necessary Pulumi libraries to manage resources on Pulumi, Kubernetes, and Linode.
- Next, we create a new Linode Kubernetes cluster by using the `linode.LkeCluster` class. This class takes parameters like the region, node pool configurations, and Kubernetes version.
  - `region` represents the Linode region where the cluster will be created.
  - `nodePools` represents the Linode instance type and count that should be part of the Kubernetes cluster.
- Once the cluster is created, we retrieve the generated `kubeconfig` which is necessary for our Kubernetes provider to interact with the new cluster.
- The Kubernetes provider is then instantiated with this `kubeconfig`, allowing us to deploy resources to our cluster.
- Using the `kubernetes.helm.v3.Chart` class, we deploy the `twampy` Helm chart. Here we specify the chart repository and any values that `twampy` requires to be customized.
  - Please replace `http://helm-repo-url/` with the actual URL of the Helm repository that hosts the `twampy` chart.
  - If there are specific values that need to be overridden in the chart, you would include them in the `values` object.
- Finally, we export the kubeconfig and the external endpoint where `twampy` can be accessed. The `twampyEndpoint` uses Pulumi's `apply` functionality to extract the load balancer's IP address to allow for external access might not be available immediately after the deployment and may vary based on the Helm chart configurations.