Deploy the fluentd-kubernetes-daemonset helm chart on Opensshift

Question

Pulumi · Accepted Answer

To deploy the `fluentd-kubernetes-daemonset` Helm chart on an OpenShift cluster using Pulumi, we'll utilize the `kubernetes.helm.v3.Chart` resource from the Pulumi Kubernetes provider. This resource allows us to deploy Helm charts in a Kubernetes cluster in a declarative way with Pulumi.

Before running the Pulumi program, it's important that you have access to an existing OpenShift cluster and have the `kubectl` CLI configured to communicate with your cluster. Pulumi interacts with the cluster API endpoint defined in the current `kubectl` context. Ensure that you are logged into the OpenShift cluster and switch to the correct project (namespace) where you wish to deploy Fluentd.

Below is a TypeScript program that will deploy the `fluentd-kubernetes-daemonset` Helm chart. The program will import the necessary packages, create a `Chart` resource, and use Pulumi to execute the deployment. The Helm chart will be fetched from the public repository, so you must ensure that this repository is accessible from your OpenShift cluster.

Here's a detailed breakdown of the Pulumi TypeScript program:

1. **Import Required Modules**: We import the Pulumi Kubernetes package to interact with the Kubernetes API and manage Helm charts.

2. **Create a Kubernetes Helm Chart Resource**: Instantiate a `Chart` resource, which represents a Helm chart deployment. We specify the chart name, any custom values we wish to provide, and the namespace for the deployment.

3. **Export Outputs**: Optionally, you can export any outputs you might need, such as the namespace of the deployed chart or any other relevant information.

Now, let's write the Pulumi program that achieves this:

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

// Deploy fluentd-kubernetes-daemonset Helm chart on OpenShift
const fluentdChart = new k8s.helm.v3.Chart('fluentd-daemonset', {
    chart: 'fluentd-kubernetes-daemonset',
    version: '1.12.3', // specify the desired chart version
    // You may need to add the repository that hosts the fluentd-kubernetes-daemonset chart using `fetchOpts`.
    repositoryOpts: {
        repo: 'https://fluent.github.io/helm-charts',
    },
    // Specify custom values for the Helm chart as needed.
    // This is an example of setting log aggregation destination and other possible values.
    values: {
        // These values are placeholders; replace them with actual data or references to it.
        elasticsearch: {
            host: 'elasticsearch.logging.svc',
            port: 9200
        },
        systemLog: {
            rootDir: '/var/log'
        },
    },
    namespace: 'logging', // replace with the namespace you desire to install the daemonset in
});

// Export the namespace of the deployed chart
export const namespace = fluentdChart.namespace;
```

When you run this Pulumi program, it will orchestrate the deployment of the `fluentd-kubernetes-daemonset` Helm chart into your OpenShift cluster. To execute this program, save it to a file (e.g., `index.ts`) and run it using the `pulumi up` command in your terminal. Pulumi will show you a preview of the deployment and prompt you for confirmation before proceeding with the actual deployment.

Remember to replace placeholder values, like the chart version or custom values, with those suitable for your environment and the version of the chart you want to deploy. Additionally, verify the Helm repository URL and ensure that the chart name and version are correct and available in the repo.