Deploy the dnation-kubernetes-monitoring-stack helm chart on Linode Kubernetes Engine

Question

Pulumi · Accepted Answer

To deploy the `dnation-kubernetes-monitoring-stack` Helm chart on Linode Kubernetes Engine using Pulumi, we will follow these steps:

1. **Set Up the Kubernetes Cluster**: We'll start by provisioning a Kubernetes cluster on Linode using Linode's Terraform provider, as Pulumi does not have a native Linode provider at the time of this writing. However, Pulumi can interoperate with Terraform providers to fill this gap.

2. **Install the Helm Chart**: Once we have access to the Kubernetes cluster, we'll install the Helm chart for `dnation-kubernetes-monitoring-stack` using Pulumi's Kubernetes provider.

Here is a step-by-step program written in TypeScript to accomplish the task:

```typescript
import * as k8s from "@pulumi/kubernetes";
import * as pulumi from "@pulumi/pulumi";
import * as linode from "@linode/terraform-provider-linode";

// Configure Linode provider
const linodeProvider = new linode.Provider("linode", {
    token: "YOUR_LINODE_API_TOKEN", // Replace with your Linode API token
});

// Provision a LKE (Linode Kubernetes Engine) cluster
const cluster = new linode.LkeCluster("my-lke-cluster", {
    k8sVersion: "1.20", // Specify your desired Kubernetes version
    region: "us-central", // Specify your desired region
    tags: ["pulumi-lke"],
    pool: [{
        type: "g6-standard-2", // This is the type of node in Linode's terminology
        count: 2, // Number of nodes in the node pool
    }],
}, { provider: linodeProvider });

// Wait for the kubeconfig to become available and create a K8s provider instance using it
const k8sProvider = pulumi.all([cluster.id, cluster.kubeconfig]).apply(([_, kubeconfig]) => {
    return new k8s.Provider("lke-k8s", {
        kubeconfig: kubeconfig,
    });
});

// Deploy the dnation-kubernetes-monitoring-stack Helm chart
const monitoringChart = new k8s.helm.v3.Chart("dnation-monitoring-stack", {
    chart: "dnation-kubernetes-monitoring-stack",
    version: "1.0.0", // Specify the version of the chart you want to deploy
    fetchOpts: {
        repo: "https://dnationcloud.github.io/helm-hub/", // The Helm repository URL
    },
}, { provider: k8sProvider });

// Export the cluster's kubeconfig and endpoint
export const kubeconfig = cluster.kubeconfig;
export const endpoint = pulumi.interpolate`${cluster.apiEndpoints[0].endpoint}`;
```

Explanation:

- We first import the necessary Pulumi modules (`@pulumi/kubernetes`, `@pulumi/pulumi`) and the `@linode/terraform-provider-linode` module to interact with Linode's services.

- We then set up the Linode provider with your Linode API token. Make sure to replace `"YOUR_LINODE_API_TOKEN"` with your actual API token. This provider is used to communicate your intentions to Linode.

- We provision a new LKE cluster with the specified Kubernetes version and node specifications. You may adjust the `k8sVersion`, `region`, `type`, and `count` to match your requirements.

- The `k8sProvider` is created using the `kubeconfig` provided by the newly created LKE cluster, which Pulumi uses to interact with the Kubernetes cluster.

- With the Kubernetes provider configured, we create a new Helm chart resource, `monitoringChart`, which installs the `dnation-kubernetes-monitoring-stack` Helm chart from the provided repository URL.

- Finally, we export the `kubeconfig` and the Kubernetes API endpoint for the LKE cluster. These can be used to interact with the cluster using `kubectl` or other Kubernetes tooling outside of Pulumi.

To set up Pulumi with Linode, your Pulumi stack configuration must contain the Linode API token, and you should have `kubectl` installed on your local machine to interact with the cluster. You would run this Pulumi program using Pulumi CLI commands such as `pulumi up` to create the resources. Remember, this code assumes you already have Pulumi set up with the appropriate credentials for Linode and the `@linode/terraform-provider-linode` installed.