Deploy the flink-cluster helm chart on Kubernetes

Question

Pulumi · Accepted Answer

To deploy the flink-cluster Helm chart on Kubernetes using Pulumi, you will first need a Kubernetes cluster. For this example, let's assume you have a cluster up and running and can access it with `kubectl`.

We will use Pulumi's `@pulumi/kubernetes` package to interact with the Kubernetes API from TypeScript code. The primary resource we will work with is `Chart`, which is Pulumi's abstraction for deploying Helm charts.

A Helm chart is a collection of pre-configured Kubernetes resources that can be managed as a unit. It's a convenient way to package, share, and install Kubernetes applications. By deploying the `flink-cluster` Helm chart, Pulumi will effectively create all the Kubernetes resources defined by the chart on your cluster.

Here's a TypeScript program that deploys the `flink-cluster` Helm chart using Pulumi:

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

// Create a Flink cluster by installing the "flink-cluster" Helm chart.
const flinkCluster = new k8s.helm.v3.Chart("flink-cluster", {
    // You can specify the Helm chart repo URL using the 'repo' option, but if it's a common chart from a large
    // registry like 'https://charts.helm.sh/stable', Pulumi understands those without specifying 'repo'.
    // The 'chart' option is the name of the chart in the repository.
    chart: "flink-cluster",
    // The 'version' option can be used to specify a specific chart version.
    // If not specified, it will install the latest version.
    version: "x.x.x", // Replace with the desired chart version.
    // Use 'values' to set configuration options for the Helm chart.
    // You can find available options in the chart's 'values.yaml' file or in the chart documentation.
    values: {
        // For example, you can set the number of TaskManager replicas like this, if it's available in the chart:
        // taskManager: {
        //   replicaCount: 2,
        // },
        // Replace with the appropriate configuration options for your needs.
    },
    // Specify the namespace to install the chart into.
    // If you omit this, Pulumi will use the default namespace.
    namespace: "default",
}, {
    // Pulumi Options:
    // Custom resource options can be applied to the Chart that may influence its behavior like transformation functions, or
    // specific dependencies on other Pulumi resources.
});

// Export the Chart's name, which includes all deployed resources as child resources.
export const flinkClusterName = flinkCluster.name;
```

### Explanation of the Code

- We import the `@pulumi/kubernetes` package, which gives us the ability to interact with Kubernetes resources in our Pulumi program.
- We create a new instance of `k8s.helm.v3.Chart`, which represents a Helm chart deployment. The first argument is the name which will be used in Pulumi to identify the resource, and the second argument is an options object.
- The `chart` option specifies the name of the Helm chart, which in this case is `flink-cluster`.
- The `version` option specifies which version of the chart to install. Replace `"x.x.x"` with the version you want to install. Remove the version field entirely if you want to install the latest version.
- The `values` object allows us to specify configuration options that are specific to the `flink-cluster` chart. You can find these options in the corresponding `values.yaml` file in the Helm chart's repository or documentation.
- The `namespace` option specifies the Kubernetes namespace to install the chart into. If not specified, the `default` namespace will be used.
- The `export` line at the bottom of the program allows you to access the name of the deployed chart from the Pulumi CLI or in the Pulumi Web Console.

To actually deploy this chart, save this code to a file like `index.ts`, run `pulumi up`, and Pulumi will execute the code to deploy the `flink-cluster` Helm chart into your Kubernetes cluster.

Please ensure you have Pulumi and the required Kubernetes configuration to interact with your cluster. If you have not set up Pulumi yet, visit the [Pulumi Installation Guide](https://www.pulumi.com/docs/get-started/install/), and for Kubernetes, see [Configure Kubernetes for Pulumi](https://www.pulumi.com/docs/intro/cloud-providers/kubernetes/setup/).

Remember to replace the `"x.x.x"` with a real version number for the Helm chart or omit it to pull the latest version. Also, you would need to fill in the `values` object with actual configuration settings relevant to the `flink-cluster` chart. These settings can typically be found in the Helm chart's `values.yaml` file or in its documentation.