Deploy the flink-kubernetes-operator-crds helm chart on Oracle Kubernetes Engine (OKE)

Question

Pulumi · Accepted Answer

To deploy the Flink Kubernetes Operator Custom Resource Definitions (CRDs) helm chart on the Oracle Kubernetes Engine (OKE), you will be using Pulumi with the Kubernetes package to manage the deployment of helm charts onto a Kubernetes cluster. Pulumi allows you to express the desired state of Helm releases declaratively and take advantage of the Helm ecosystem directly from within your Pulumi program.

We will be using the `kubernetes.helm.v3.Chart` resource which is a high-level component that provides a simple API to deploy Helm charts into a Kubernetes cluster. Helm is a package manager for Kubernetes which allows you to package, configure, and deploy applications and services onto Kubernetes clusters.

Here's a Pulumi program written in TypeScript that accomplishes the deployment. This assumes that you already have an Oracle Kubernetes Engine cluster up and running and have configured `kubectl` to interact with that cluster:

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

// Provide the name of the chart and the version.
const flinkOperatorChart = new kubernetes.helm.v3.Chart("flink-kubernetes-operator-crds", {
    chart: "flink-kubernetes-operator-crds",
    // Make sure to replace with the correct chart repository URL or name here.
    repo: "my-helm-chart-repo",
    version: "0.1.0", // replace with the desired chart version
    // Optionally, you can specify the namespace where you want to deploy the CRDs, if not specified, it defaults to 'default'.
    namespace: "flink-operator",
    // Below is a placeholder to illustrate where you can put your values, refer to the Helm chart's values.yaml for what can be customized.
    values: {
        // Add custom values for the Flink operator helm chart here.
    },
});

// Export the resource name of the Helm chart.
export const helmChartName = flinkOperatorChart.getResourceName();
```

In the code above:

- We imported the Kubernetes package from Pulumi which provides the necessary resources to interact with your Kubernetes cluster.
- We created an instance of `Chart`, providing it the name of the Helm chart (`flink-kubernetes-operator-crds`), a repository where the chart is stored, and the desired version of the chart. Replace `"my-helm-chart-repo"` with the actual Helm repository that hosts the Flink Kubernetes Operator CRDs chart.
- Optionally, you can specify the `namespace` where you would like the Helm chart to be deployed. If you don't specify it, Kubernetes will use the `default` namespace.
- The `values` key allows you to override the default values of the Helm chart with your configurations. This is similar to how you would pass a custom `values.yaml` file when using the Helm CLI.
- Finally, `helmChartName` is an exported constant that will output the name of the Helm chart once it's deployed, which you can use to reference and query the status of your Helm deployment.

This program, when run with Pulumi, will perform an installation of the Flink Kubernetes Operator CRDs helm chart on your OKE cluster. Please make sure you review the values and customize them according to your needs before running the program.

To run the Pulumi program:

1. Ensure you have Pulumi installed and configured to connect with your OKE cluster.
2. Save the above program in a file named `index.ts`.
3. Run `pulumi up` in the directory containing your program file to execute the deployment.

The command will present a preview of the resources to be created and ask for confirmation before proceeding with the changes to your cluster. If everything looks correct, confirm the deployment, and Pulumi will manage the Helm chart installation for you.