Deploy the onos-helm-chart helm chart on Linode Kubernetes Engine

Question

Pulumi · Accepted Answer

In order to deploy the ONOS (Open Network Operating System) Helm chart on Linode Kubernetes Engine (LKE), you'll need to have a few items prepared:

- A Linode account and an LKE cluster up and running.
- `kubectl` configured to communicate with your LKE cluster.
- Helm installed on your local machine, to package and deploy the ONOS Helm chart.
- Pulumi installed on your local machine, to manage and provision infrastructure as code.
- The ONOS Helm chart or access to its repository to fetch the chart.

Assuming you have the above prerequisites ready, the following Pulumi program will guide you through the steps of deploying the ONOS Helm chart on your LKE cluster. The program uses Pulumi's TypeScript SDK to create a new helm chart resource on a Kubernetes cluster provisioned by Linode.

The key resource used in the program is the `helm.v3.Chart` provided by Pulumi's Kubernetes provider, which allows us to deploy Helm charts. Make sure you replace `YOUR-CHART-URL` with the actual URL where your ONOS Helm chart is located or the name of the chart if it's already added in your Helm repository.

Let's look at the program with detailed comments explaining each part:

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

const onosChart = new k8s.helm.v3.Chart("onos-helm-chart", {
    // The `chart` parameter specifies the name of the Helm chart.
    // You should replace `"onos"` with the actual chart name if different.
    chart: "onos",

// The `version` parameter can be used to specify a specific chart version.
    // Here it's set dynamically, so it would deploy the latest version.
    // You can explicitly set a version string like "1.0.0" to ensure consistency.
    version: "latest",

// The `fetchOpts` parameter allows specifying various settings that control
    // how Helm fetches the chart, such as a repository's URL.
    fetchOpts: {
        // Replace `"YOUR-CHART-URL"` with the actual repository URL for the ONOS Helm chart.
        repo: "YOUR-CHART-URL",
    },

// The `namespace` parameter sets the Kubernetes namespace where the chart should be deployed.
    // The default is 'default', but it can be changed to any existing namespace.
    namespace: "default",

// The `values` parameter allows you to provide a set of values to customize the deployed chart.
    values: {
        // Customize the chart values as necessary for ONOS deployment.
        // This might be different based on the ONOS chart you are using.
        service: {
            type: "LoadBalancer",
        },
        // More customization can be done depending on the ONOS Helm chart's values specification.
    },
});

// To access the ONOS service once it is deployed, you will likely need its external IP or DNS name.
// This can vary on how services are exposed in your LKE cluster.
export const onosServiceIP = onosChart.getResourceProperty("v1/Service", "onos-helm-chart-onos-service", "status");
```

Make sure to install the necessary Pulumi packages before running the program:

```bash
npm install @pulumi/kubernetes
```

This program defines a single Pulumi resource of type `helm.v3.Chart` which instructs Pulumi to deploy the ONOS Helm chart onto your Kubernetes cluster.

Once you run the program with `pulumi up`, Pulumi will provision the ONOS Helm chart onto your LKE cluster. Pulumi will perform the necessary steps, and upon completion, it will output any exported variables, which in this case may include the external IP or DNS name to access the ONOS service.

Please replace placeholders like `YOUR-CHART-URL` with the actual values that are applicable to your Helm chart. If you encounter any issues with the chart values, refer to the ONOS Helm chart's documentation for guidance on what values can be configured.