Deploy the kubegpt helm chart on Linode Kubernetes Engine

Question

Pulumi · Accepted Answer

To deploy the `kubegpt` Helm chart on Linode Kubernetes Engine (LKE), you'll need to follow these steps:

1. **Set up a Linode Kubernetes Cluster**: The first step is to ensure you have an LKE cluster up and ready to use. This can be done through the Linode Cloud Manager or using the Linode Terraform provider.

2. **Install Pulumi**: If you haven't already installed Pulumi, you must do so. Pulumi is a tool for creating, deploying, and managing cloud infrastructure using code written in general-purpose programming languages.

3. **Configure Pulumi for Linode**: This involves setting up the necessary access tokens and permissions for Pulumi to interact with your Linode account.

4. **Write the Pulumi Program**: Using TypeScript, we will write a program that instructs Pulumi to deploy the `kubegpt` Helm chart onto your LKE cluster.

5. **Deploy**: Lastly, you'll run the Pulumi program to deploy the Helm chart.

Now let's get into the details of the Pulumi program.

This program assumes that you have already configured your Pulumi environment with the necessary Linode access tokens and have a Linode Kubernetes cluster ready. If you haven't set up the cluster yet, you can create one through the Linode Cloud Manager or programmatically using Pulumi with the Linode provider.

Once you've got Pulumi set up and configured, you can deploy the `kubegpt` Helm chart to your LKE cluster. Below is a TypeScript program that demonstrates how to do this using Pulumi's Kubernetes provider.

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

// Provide the name of your Linode Kubernetes Engine cluster
const clusterName = "my-lke-cluster";

// Retrieve the kubeconfig for your LKE cluster
const kubeconfig = {
    // TODO: Replace with the actual method to get the LKE cluster kubeconfig
    // This might involve fetching it from the Linode API or from a saved location
};

// Create a Kubernetes Provider pointing to the LKE cluster using the obtained kubeconfig
const provider = new k8s.Provider("lke-k8s-provider", {
    kubeconfig: kubeconfig,
});

// Define the Helm chart information.
const chartName = "kubegpt";
const helmChartRepo = "https://charts.example.com/"; // Update with the actual Helm chart repo URL if available
const helmChartVersion = "1.0.0"; // Update with the desired chart version

// Deploy the Helm chart 'kubegpt' to the LKE cluster.
const helmChart = new k8s.helm.v3.Chart(
    "kubegpt-chart",
    {
        chart: chartName,
        version: helmChartVersion,
        fetchOpts: {
            repo: helmChartRepo,
        },
    },
    { provider: provider }
);

// Export the URL for the deployed application (adjust if the service type is not LoadBalancer)
export const applicationURL = helmChart.getResourceProperty(
    "v1/Service",
    "kubegpt-service", // Replace with the actual name of the service from the kubegpt chart
    "status"
).apply(status => status.loadBalancer.ingress[0].ip);
```

In this program:

- We import the `@pulumi/kubernetes` package to interact with Kubernetes resources.
- A local variable `clusterName` is declared to identify the cluster you're deploying the chart to. Make sure to update it with the name of your actual LKE cluster.
- `kubeconfig` refers to the configuration information your Kubernetes client needs to connect to the LKE cluster. You would need to retrieve this from the Linode Cloud Manager or use the Linode API.
- We create a new Pulumi Kubernetes Provider which tells Pulumi to use this kubeconfig to manage resources in the specified cluster.
- In the `helmChart` resource declaration, we specify the chart's name, the repository where the chart can be found, and the version you want to deploy. Update these details with the actual values for the `kubegpt` chart.
- Finally, we export the URL where the application will be accessible if the service type is LoadBalancer.

To deploy this chart, save this code into a file called `index.ts` in your Pulumi project directory. Then, run `pulumi up` using your command line, which will provision the resources as defined in the code.

Remember to replace placeholder texts such as the Helm chart repository URL, chart name, chart version, and the actual name of the Kubernetes service with real values. If the `kubegpt` Helm chart requires specific configuration values, you can supply them through the `values` property in the `ChartArgs` object.