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

Question

Pulumi · Accepted Answer

To deploy the `fluentd-cloudwatch` Helm chart on Oracle Kubernetes Engine (OKE), we are going to use Pulumi's `@pulumi/kubernetes` package which enables us to manage Kubernetes resources including deploying Helm charts.

Here is the step by step process and the corresponding Pulumi program:

1. **Setup the OKE Cluster**: Before deploying any Helm charts, we must have a Kubernetes cluster available. In this scenario, we will assume that an OKE cluster is already set up and configured to use with `kubectl` and Pulumi. Pulumi would communicate with this cluster using the `kubeconfig` file that contains connection information.

2. **Install Pulumi Kubernetes Package**: We need to install the required Pulumi Kubernetes SDK. If you haven't already, you can add it to your project using npm:

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

3. **Create a Kubernetes Provider**: This is needed to inform Pulumi about the cluster where resources are to be deployed. We will extract the kubeconfig for the OKE cluster from the `OCI` configuration.

4. **Deploy the Helm Chart**: We will use `@pulumi/kubernetes/helm.v3.Chart` resource to deploy the `fluentd-cloudwatch` Helm chart. The chart's configuration values can be customized as necessary.

5. **Exporting stack outputs**: If required, we can export URLs or other data that will help us to interact with the deployed chart.

Below is a Pulumi program in `TypeScript` that demonstrates the deployment of the `fluentd-cloudwatch` Helm chart on an existing OKE cluster:

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

// If you have your OKE `kubeconfig` saved locally, you can use it as follows:
// const kubeconfig = fs.readFileSync("<path-to-kubeconfig-file>").toString();

// For this code snippet, we assume the kubeconfig is already set in the environment or in the default location `~/.kube/config`.
// Pulumi automatically uses the kubeconfig from the default location if it's not provided explicitly.

// Step 3: Instantiate the kubernetes provider with the kubeconfig from OCI
const provider = new k8s.Provider("oke-k8s", {
    // kubeconfig is sourced from standard kubeconfig file location
    // Uncomment and replace the kubeconfig path if necessary
    // kubeconfig: kubeconfig,
});

// Step 4: Deploy the fluentd-cloudwatch Helm chart using the provider
const fluentdCloudwatchChart = new k8s.helm.v3.Chart("fluentd-cloudwatch", {
    chart: "fluentd-cloudwatch",
    // Replace `REPO` with the name of your Helm chart's repository
    fetchOpts:{ repo: "https://REPO/fluentd-cloudwatch/" },
    // Specify the version of the chart if needed
    // version: "X.Y.Z",
    values: {
        // Place your configuration values here. For example:
        awsRegion: "us-west-2", // Change to the appropriate AWS region
        // You may need to fill in more values depending on your requirements.
    },
}, { provider: provider });

// For Output, the fluentd-cloudwatch chart might expose certain endpoints or artifacts that we might want to export
// Here's how you could export a Helm chart value, for example:
export const fluentdCloudwatchChartName = fluentdCloudwatchChart.metadata.name;
```

In the example above:

- We use the `@pulumi/kubernetes/helm.v3.Chart` class from Pulumi's Kubernetes SDK to represent a Helm chart in the Pulumi program.
- We fetched the chart from a hypothetical Helm repository. Replace `REPO` with the actual repository URL where the `fluentd-cloudwatch` chart is located. If it's a public chart, it could be from the official Helm repository or other public repositories.
- We added some place-holder values configuration under `values`. You will need to replace these with actual configuration values relevant to `fluentd-cloudwatch` and your AWS environment (like `awsRegion`).
- We used `export` at the end of the program to make the deployed chart name a stack output, which can be viewed after the deployment.

This Pulumi program must be run in a directory where a Pulumi project has been created. If you haven't yet created a new Pulumi project, you can start with `pulumi new kubernetes-typescript`. This command will scaffold a new Pulumi project for Kubernetes using TypeScript. Remember that before running `pulumi up` to apply your program, you need to install dependencies with `npm install`.

I hope this helps you understand how to deploy the `fluentd-cloudwatch` chart to OKE using Pulumi. If you need more information or help on configuring other aspects of the chart, refer to the chart's documentation specific to fluentd-cloudwatch for relevant values to pass.