Deploy the fin-engine helm chart on Kubernetes

Question

Pulumi · Accepted Answer

To deploy a Helm chart on a Kubernetes cluster using Pulumi, we will use the `kubernetes.helm.v3.Chart` resource from the Pulumi Kubernetes provider. This resource allows us to deploy a Helm chart as part of our Pulumi stack, and it is capable of fetching charts from Helm repositories or from a local path.

The program will consist of these steps:

1. Create an instance of the `kubernetes.helm.v3.Chart` resource class, representing the Helm chart deployment.
2. Configure the parameters of the chart, such as the release name, the chart name, and any values that should be overridden in the Helm chart's `values.yaml` file.
3. Set any necessary configurations for the Kubernetes provider if not using the default context from the kubeconfig file.

Below is a Pulumi TypeScript program that deploys the hypothetical "fin-engine" Helm chart to a Kubernetes cluster. We will assume that you have already configured Pulumi with the right credentials to access a Kubernetes cluster and that the Helm chart called "fin-engine" is available in a Helm repository that's been added to your development environment.

Here is your Pulumi TypeScript program:

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

// Create a new Helm Chart resource that deploys the "fin-engine" chart.
// This assumes that you have access to the chart in a Helm repository.
const finEngineChart = new kubernetes.helm.v3.Chart("fin-engine", {
    // Specify the Helm chart repository and the chart name.
    // Replace with the correct repository and chart name if necessary.
    repo: "my-helm-repo",
    chart: "fin-engine",
    
    // Optionally, provide custom values to override the chart's default values.
    // This is equivalent to using `--set` in the Helm CLI or modifying the `values.yaml` file.
    values: {
        // Replace the following value names and literals with the correct ones for the "fin-engine" chart.
        serviceType: "ClusterIP",
        replicaCount: 2,
        // Add other custom values as required by your Helm chart.
    },
    
    // Define the namespace where the "fin-engine" chart should be deployed.
    // If not specified, it defaults to the "default" namespace.
    namespace: "finance"
});

// (Optional) You might want to export some values from the deployed resources, for example, the service endpoint.
export const finEngineServiceEndpoint = finEngineChart.getResourceProperty("v1/Service", "fin-engine-service", "status.loadBalancer.ingress[0].ip");

// Note that "fin-engine-service" should be replaced with the actual resource name if different.
```

In this program, we have a Pulumi resource called `finEngineChart` that represents the Helm chart for the financial engine application you're talking about deploying. We're specifying the repository where the Helm chart resides; in the example above, we pretend it is in "my-helm-repo". Adjust this to point to where your chart is actually located.

The `values` object within the Chart resource is how you can override default settings within the Helm chart, in the same way as if you were passing `--set key=value` to the Helm CLI. We're setting a hypothetical service type and the number of replicas.
 
The `namespace` parameter is optional and allows you to specify which Kubernetes namespace to deploy the chart into. If it's not specified, the default namespace is used.

At the end of the program, there's an optional export statement that would output the service endpoint of the deployed `fin-engine` service. This assumes that your Helm chart creates a Kubernetes `Service` with the name `fin-engine-service` and that it's using a `LoadBalancer` service type. If your service type or resource name differs, you will need to adjust the resource kind and name accordingly.