1. Deploy the rke2-coredns helm chart on Linode Kubernetes Engine


    To deploy the rke2-coredns helm chart on a Kubernetes cluster within Linode Kubernetes Engine (LKE), you will need to follow a few steps:

    1. Set up a Linode Kubernetes Engine cluster: To deploy Helm charts, you need an existing Kubernetes cluster. If you already have a Linode Kubernetes Engine cluster, you can use it. Otherwise, you would need to create one. There is a Pulumi resource for creating a cluster on Linode, but since we don't have specific registry results for Linode, I will assume you have this set up already.

    2. Install the Pulumi Kubernetes provider: This provider allows you to create, update, and manage Kubernetes resources with Pulumi.

    3. Deploy the Helm Chart: You will define a Helm chart resource in your Pulumi program and specify the necessary parameters, such as the Helm chart name, repository, and any configurations required by the rke2-coredns chart.

    Now, let's walk through a TypeScript Pulumi program that deploys the rke2-coredns Helm chart to an existing Linode Kubernetes cluster.

    First, ensure you have the following prerequisites completed:

    • You must have Pulumi CLI installed on your machine.
    • You should have kubectl configured with access to your Linode Kubernetes cluster.
    • Node.js and npm must be installed to run the Pulumi program in TypeScript.

    We will now write the Pulumi program:

    import * as k8s from "@pulumi/kubernetes"; // Create a Kubernetes provider instance using the context of your Linode Kubernetes cluster. // Ensure your `kubectl` is configured with the context for the LKE. const provider = new k8s.Provider("lke-k8s", { // `context` is omitted to use the current context from the `kubectl` config by default. }); // Deploy the rke2-coredns Helm chart. const corednsChart = new k8s.helm.v3.Chart("rke2-coredns", { // Specify the chart name and repository URL where the chart can be found. // You may need to update the repository URL to the one that hosts the rke2-coredns chart. chart: "coredns", repo: "https://charts.rancher.io", // Specify the namespace and version of the chart if needed namespace: "kube-system", // This is a common namespace for core system services in Kubernetes. version: "1.16.1", // Use the appropriate version number for the rke2-coredns chart. // Add any custom values you want to pass to the Helm chart. For example: values: { // These values would depend on the specific configuration options that the `rke2-coredns` chart supports. // Replace these with actual configuration keys and values as necessary. replicas: 2, serviceType: "ClusterIP", }, }, { provider }); // Export the ClusterIP of the CoreDNS service. export const corednsClusterIP = corednsChart.getResourceProperty("v1/Service", "coredns", "spec.clusterIP");

    In this code, the @pulumi/kubernetes package is used to interact with Kubernetes resources. A new instance of a Kubernetes provider is created to interact with your existing Linode Kubernetes Engine cluster by using the current context from your kubectl config file; this does not create a new LKE cluster.

    A Helm chart is instantiated using k8s.helm.v3.Chart. It's crucial to specify the correct Helm chart name coredns and repository URL that should correspond to where the rke2-coredns chart is located. You need to ensure that the namespace (kube-system by default) and the chart version are specified as required.

    We export the ClusterIP of the deployed CoreDNS service so that you can access it if necessary.

    Please remember to replace repo, namespace, version, and items in values with appropriate values for the rke2-coredns chart you are deploying.

    You run this program by executing pulumi up, which will perform the deployment as described in the code. If successful, you should see the resources created and the ClusterIP of the CoreDNS service being exported.