Deploy the base-openstack helm chart on Linode Kubernetes Engine

Question

Pulumi · Accepted Answer

To deploy the `base-openstack` Helm chart on the Linode Kubernetes Engine using Pulumi, you would follow the steps outlined below:

1. **Set up a Linode Kubernetes Cluster**: The Linode Kubernetes Engine (LKE) allows you to deploy and manage container workloads. You will need to have a Linode cluster ready for deploying your Helm charts. You can either use an existing cluster or create a new one.

2. **Install Pulumi**: If you don't already have Pulumi installed, you need to install it. This can be done by following the installation instructions on the Pulumi website.

3. **Configure Pulumi for Linode**: Ensure you have the necessary credentials configured for Pulumi to interact with your Linode account and Kubernetes cluster.

4. **Write the Pulumi Code**: With Pulumi, you use familiar languages such as TypeScript to declare your cloud resources. To deploy a Helm chart, you would use Pulumi's Kubernetes provider, which allows you to manage Kubernetes resources with declarative code.

5. **Deploy the Helm Chart**: Use the Pulumi Kubernetes provider to install your chosen Helm chart to the LKE cluster.

Below is a Pulumi TypeScript program that explains how you might deploy the `base-openstack` Helm chart to a Kubernetes cluster on Linode.

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

// Step 1: Configure your kubeconfig. Ensure your Pulumi program has access
// to the kubeconfig file for the Linode Kubernetes Engine (LKE).
const kubeconfig: string = "your-kubeconfig-data"; // Replace with the actual kubeconfig data or file path

// Step 2: Helm Chart deployment.
// You instantiate a Helm chart using the `k8s.helm.v3.Chart` class from the Pulumi Kubernetes provider.
// You will need to provide the repo and chart names, along with any specific configurations
// you want to override in the `values` object.
const baseOpenstackHelmChart = new k8s.helm.v3.Chart("base-openstack-chart", {
    chart: "base-openstack", // The name of the chart
    // Replace with repository URL where the chart can be fetched from if needed.
    fetchOpts: { repo: "https://charts.example.com/" },
    // You can provide custom values to your Helm chart. These values will override the defaults.
    // This is an empty example and should be filled with actual values as needed.
    values: {
        serviceName: "openstack-service",
        image: "openstack-image",
        // Add more Helm chart values here
    },
}, { provider: new k8s.Provider("lke-k8s", { kubeconfig }) });

// Step 3: Export resources created by the Helm chart
// After the deployment, you can export certain values or URLs that may be needed to interact
// with the resources that the Helm chart has deployed. This will depend on what resources
// the `base-openstack` Helm chart creates. Below are placeholder exports for illustration.
export const serviceUrl = baseOpenstackHelmChart.getResourceProperty(
    "v1/Service",
    "openstack-service",
    "status",
    "loadBalancer",
    "ingress",
    "0",
    "ip"
);
```

**Explanation:**

This Pulumi code snippet assumes that you have a Kubernetes cluster in Linode and you have the kubeconfig data ready to use. The program defines a Helm chart deployment using Pulumi’s Kubernetes (k8s) package.

- The `kubeconfig` variable is where you would place your cluster's kubeconfig data or reference to your kubeconfig file. It's critical for Pulumi to access and manage your cluster.

- `k8s.helm.v3.Chart` creates a Helm chart resource. You specify the chart name, repo, and values you want to override here. The `repo` URL is a placeholder and should be replaced with the actual repository where the `base-openstack` chart is stored.

- The `provider` argument is used to explicitly pass a Pulumi Kubernetes provider configured with the LKE kubeconfig.

- Finally, the `export` statement is used to output the IP address of a service, for example, that is created as a result of deploying the Helm chart. This can be used to access the deployed application from the internet.

You would need to run `pulumi up` in a directory with this code to create the resources on Linode Kubernetes Engine. It will show you a preview of the resources that Pulumi will create, update, or delete. After reviewing the changes, you can confirm the deployment, and Pulumi will execute the actions to deploy the `base-openstack` Helm chart.