Deploy the rotate-elasticsearch-index helm chart on Oracle Kubernetes Engine (OKE)

Question

Pulumi · Accepted Answer

To deploy a Helm chart on Oracle Kubernetes Engine (OKE) using Pulumi, you'll need to set up a few things:

1. A Kubernetes cluster on Oracle Cloud Infrastructure (OCI) using the OKE service - Ensure that you have an OKE cluster up and running and that your local environment is configured with the correct credentials to interact with your OCI account.

2. Helm and Pulumi - Helm is a package manager for Kubernetes that facilitates the deployment and management of applications. Pulumi is an infrastructure as code tool that allows you to define and manage infrastructure using code. You'll need both tools installed and configured on your local machine.

3. The Pulumi OCI provider - This provider allows Pulumi to interact with OCI services, including OKE. You'll use it to create instances of Kubernetes-related resources, such as namespaces or other prerequisites needed by the Helm chart.

4. The Pulumi Kubernetes provider - This provider lets you work with Kubernetes resources in your Pulumi program. You'll use it to deploy the Helm chart for rotating Elasticsearch indices.

Below, there's a detailed TypeScript program using Pulumi to deploy the `rotate-elasticsearch-index` Helm chart to an existing OKE cluster. This program assumes that you already have an OKE cluster and that your local environment is set up to communicate with your OCI account, as well as with your Kubernetes cluster.

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

// Name of the Helm chart
const helmChartName = "rotate-elasticsearch-index";
// Version of the Helm chart
const helmChartVersion = "1.2.3"; // Replace with the actual chart version you wish to deploy
// Repository URL of the Helm chart
const helmChartRepo = "https://charts.mycompany.com/"; // Replace with the actual chart repository URL

// The namespace where the Helm chart will be deployed.
// It's a good practice to not deploy applications in the default namespace.
const appNamespace = new k8s.core.v1.Namespace("app-namespace", {
    metadata: {
        name: "rotate-index"
    }
});

// Deploy the rotate-elasticsearch-index Helm chart using the kubernetes.helm.v3.Chart resource.
const rotateIndexChart = new k8s.helm.v3.Chart(helmChartName, {
    namespace: appNamespace.metadata.name,
    chart: helmChartName,
    version: helmChartVersion,
    fetchOpts: {
        repo: helmChartRepo,
    },
    // Values to configure your Helm chart. These should be set according to the chart's values.yaml file.
    values: {
        // For example, you might set the Elasticsearch connection details and other necessary configurations
        elasticsearch: {
            hosts: ["http://elasticsearch-master:9200"],
            // Other Elasticsearch-related configurations...
        },
        // Additional configurations...
    }
}, { dependsOn: [appNamespace] });

// Export the namespace name
export const namespaceName = appNamespace.metadata.name;
// Export the status of the Helm chart
export const rotateIndexChartStatus = rotateIndexChart.status;
```

### Explanation

1. **Imports**: We have imported the necessary modules from Pulumi's Kubernetes provider. This allows you to create and manage Kubernetes resources using TypeScript.

2. **Helm Chart and Configuration**: We specified the Helm chart's name, version, and the repository where the chart is located.

3. **Namespace**: We created a new Kubernetes namespace `rotate-index` where the Helm chart will be deployed. Namespaces help you organize your Kubernetes resources and can also help with access control.

4. **Helm Chart Deployment**: The Rotate Elasticsearch Index Helm chart is deployed using the Pulumi Kubernetes `Chart` resource from the `@pulumi/kubernetes` package.

5. **Configuration with Values**: We have indicated where you should provide chart-specific configurations that the Helm chart expects. These configurations (`values`) should match the structure and expectations of the charts `values.yaml` file.

6. **Dependencies**: We specify that the Helm chart deployment depends on the successful creation of the namespace.

7. **Exports**: We export the namespace name and the Helm chart's status so that they can be easily accessed after deployment.

Remember to set up your Pulumi stack and configure it correctly with the OCI and Kubernetes credentials. You will need to have Pulumi and Helm available on your local development machine to use this Pulumi program.

After defining this program, run it with Pulumi's CLI tools to deploy your Helm chart to your existing OKE cluster:

```bash
pulumi up
```

This command will show you a preview of what will be created and ask for confirmation before proceeding with the actual deployment. If everything looks correct, you can confirm the deployment, and Pulumi will perform the necessary actions to deploy your Helm chart.