Deploy the glowroot helm chart on Linode Kubernetes Engine

Question

Pulumi · Accepted Answer

Deploying a Helm chart to a Kubernetes cluster involves a few steps. Firstly, you need to have a Kubernetes cluster running. Once you have that, you can install Helm, which is a package manager for Kubernetes that allows you to package, configure, and deploy applications and services onto the Kubernetes cluster.

For deploying the glowroot Helm chart on Linode Kubernetes Engine (LKE), you would need to:

Set up the Linode Kubernetes Engine cluster: Assuming you've already provisioned an LKE cluster using Linode's management console or CLI, you should have your kubeconfig file ready to interact with your cluster through kubectl.
Install Helm: You need to install Helm on your local machine or wherever you plan to drive the deployment from. Follow the installation instructions for your operating system from the Helm documentation.
Add the Repository: Helm charts are typically hosted in repositories. If glowroot has a dedicated repository, you'll need to add that repository to your Helm configuration.
Deploy the Chart: After adding the repository, you can deploy glowroot using helm install, passing in any necessary values for the glowroot chart configuration.

For this walkthrough, I'll show you how to write a Pulumi program that does the following:

Assumes the Linode Kubernetes cluster is already provisioned.
Uses Pulumi's Kubernetes provider to deploy the glowroot Helm chart.

Here's a sample program written in TypeScript using Pulumi:

import * as kubernetes from "@pulumi/kubernetes";

// Create a Pulumi Kubernetes provider that targets our Linode Kubernetes cluster.
// The kubeconfig file must be available to Pulumi for this operation.
const linodeK8sProvider = new kubernetes.Provider("linodeK8s", {
    kubeconfig: "<path-to-your-kubeconfig>",
});

// Deploy the glowroot Helm chart.
const glowrootChart = new kubernetes.helm.v3.Chart("glowroot", {
    chart: "glowroot",
    version: "<chart-version>", // replace with the desired chart version
    fetchOpts:{
        repo: "https://helm.glowroot.org", // specify the repository URL if available
    },
}, { provider: linodeK8sProvider });

// Export the public Service endpoint of the glowroot
export const glowrootServiceEndpoint = glowrootChart.getResourceProperty("v1/Service", "glowroot-agent", "status").apply(status => status.loadBalancer.ingress[0].ip);

Let's break down the code above:

We import the Pulumi Kubernetes package.
We create a Kubernetes provider instance that Pulumi will use to communicate with the LKE cluster using the kubeconfig.
We declare a new Helm chart resource using kubernetes.helm.v3.Chart to manage the glowroot Helm Chart. You'll need to specify the chart name, possibly the version, and the repository where the chart is hosted. If glowroot is hosted on a public Helm repository, replace the repo property with the correct URL.
Lastly, we export the IP address of the Glowroot service if it's exposed externally. This export will return the endpoint that you can use to interact with glowroot once it's deployed.

Please note:

Replace <path-to-your-kubeconfig> with the actual path to your kubeconfig file that allows access to your LKE cluster.
Update the chart and version arguments to point to the specific version of the glowroot chart you want to deploy.
If glowroot has a special namespace or other specific deployment configurations, you will need to adjust the chart's input arguments accordingly.

Before running this Pulumi program, you should have Pulumi CLI installed and set up. To run the program, you'll typically execute pulumi up within your project directory, which will prompt Pulumi to perform the deployment.

Remember, this program assumes you have a pre-existing LKE cluster and Helm is already set up in your environment. If you need to create the LKE cluster programmatically or configure Helm through Pulumi, additional steps would be required.