Deploy the fluentd-kubernetes helm chart on Oracle Kubernetes Engine (OKE)

Question

Pulumi · Accepted Answer

To deploy the `fluentd-kubernetes` Helm chart on Oracle Kubernetes Engine (OKE), we'll use the Pulumi Kubernetes provider to interact with your Kubernetes cluster. Specifically, we will be using `kubernetes.helm.v3.Chart`, which is a component within the Pulumi Kubernetes provider that allows you to deploy Helm charts.

Before starting, ensure you have the following prerequisites met:

1. **Pulumi CLI installed**: Make sure to have [Pulumi CLI installed](https://www.pulumi.com/docs/get-started/install/) on your machine.
2. **Kubernetes cluster**: You should have an Oracle Kubernetes Engine (OKE) cluster up and running.
3. **Kubeconfig File**: You should have a kubeconfig file that provides the connection configuration for your OKE cluster. Pulumi uses this file to interact with your Kubernetes cluster.
4. **Helm**: Helm must be initialized in your cluster if it isn't already.

Below is the TypeScript program that uses Pulumi to deploy the `fluentd-kubernetes` Helm chart to your OKE cluster.

I will provide a detailed explanation of the TypeScript code for deploying a Helm chart using Pulumi:

1. **Import Dependencies**: We'll start by importing the necessary modules from the Pulumi Kubernetes package.
2. **Create a Kubernetes Provider**: We need to create a Kubernetes provider instance, which will use our kubeconfig to interact with our cluster.
3. **Deploy the Helm chart**: Using the `Chart` resource, we'll deploy the `fluentd-kubernetes` chart from its repository.

Here's the full Pulumi program in TypeScript:

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

// Define the settings for our Helm release.
const fluentdChart = new k8s.helm.v3.Chart("fluentd-kubernetes", {
    // You need to specify the repository where `fluentd-kubernetes` chart is hosted.
    // For the sake of demonstration, let's assume it's at "https://charts.fluentd.io".
    // You need to replace "https://charts.fluentd.io" with the actual repository URL.
    chart: "fluentd",
    version: "1.0.0", // Replace with the correct chart version
    fetchOpts: {
        repo: "https://charts.fluentd.io", // Replace with the correct repository
    },
    // Include any custom values you wish to override.
    values: {
        // Sample value override; the actual values will depend on your specific chart version
        // and your configuration needs.
        someValue: "someOverride",
    },
});

// Export any of the required resources that are created.
export const fluentdReleaseName = fluentdChart.getResourceName("v1/Service", "fluentd-kubernetes");
```

This program creates a new Helm chart resource using Pulumi's Kubernetes provider. It specifies the chart name, version, and the Helm repository that hosts the `fluentd-kubernetes` chart. If there are specific configurations or values you want to override in the default Helm chart, you can specify them in the `values` block.

One important note is to replace `"https://charts.fluentd.io"` with the actual Helm repository URL in the `repo` field. The `version` should also be set to the chart version you want to deploy.

The `export` statement at the end helps to output the result of your deployment, which in this case is the release name for the deployed fluentd service. You can use this in your CI/CD system or command line to get the deployment details.

After writing this program, save it in a file (e.g., `index.ts`). To deploy the Helm chart, you would run this program using the Pulumi CLI commands `pulumi up`. Ensure you are authenticated with your Kubernetes cluster and have the appropriate permissions to deploy resources.

Remember to review the Helm chart values and adapt them to your specific configuration needs for deployment on your Oracle Kubernetes Engine cluster.