Deploy the fmtok8s-tickets-service helm chart on Kubernetes

Question

Pulumi · Accepted Answer

To deploy a Helm chart on Kubernetes using Pulumi, you need to first have a Kubernetes cluster running and accessible. For the purpose of this explanation, I'm going to assume you have a Kubernetes cluster configured and that you have the necessary access to deploy applications to it.

We'll be using the Pulumi Kubernetes provider to interact with your Kubernetes cluster. Specifically, we'll use the `Chart` class from the `@pulumi/kubernetes/helm/v3` module to deploy a Helm chart.

Here's how it typically works:

1. **Create a new TypeScript file**: This will be the main file where you will define the infrastructure as code.
2. **Import the necessary Pulumi and Kubernetes classes**: You need to import the Pulumi classes to work with Kubernetes.
3. **Instantiate a chart**: You'll need to provide the name of the chart, and optionally, the version and any custom values you'd like to provide to the Helm chart.

Before proceeding, make sure that you have Pulumi CLI installed, and you are logged in to the Pulumi service or set up for local state management.

Now, let’s write the TypeScript code to deploy the `fmtok8s-tickets-service` Helm chart.

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

// Define the Helm chart, its version and any custom values you'd like to add as per the chart's `values.yaml`.
const ticketServiceChart = new k8s.helm.v3.Chart("fmtok8s-tickets-service", {
    chart: "fmtok8s-tickets-service",
    // Add the version if it is a specific one you need, otherwise, the latest version is taken.
    // version: "1.0.0",
    // Specify the Helm repository URL that contains your chart, if it's not one of the default repositories.
    fetchOpts: {
        repo: "https://your-helm-chart-repository.com/", // Replace with your Helm chart repository URL.
    },
    // Define any custom values for the Helm chart, similar to using `--set` parameters with `helm install`.
    values: {
        // For example, if you want to set a replica count and image tag:
        replicaCount: 3,
        image: {
            tag: "latest",
        },
        // Add other custom configuration here based on the specific Helm chart's "values.yaml".
    },
    // Specify the namespace to deploy to, if required.
    namespace: "default" // Change this if you want to deploy the chart in a different namespace.
});

// Optionally, export URLs or other data you'll need to access your service.
// For example, if the chart exposes a service with an external IP:
export const serviceUrl = ticketServiceChart.getResourceProperty("v1/Service", "fmtok8s-tickets-service", "status")
    .apply(status => status.loadBalancer.ingress[0].ip);
```

Remember to replace the `repo` and `values` fields with the actual repository URL where the `fmtok8s-tickets-service` chart is hosted and any custom values the chart requires. The `values` should correspond to the settings in the chart's `values.yaml` file and allow you to configure the chart to match your requirements.

After this, you can run `pulumi up` to deploy your Helm chart to the Kubernetes cluster.

This script initializes a new Helm chart instance using the `Chart` class, setting the desired state for our `fmtok8s-tickets-service`. Pulumi will then figure out what Kubernetes resources are needed to create this state, and apply them to your cluster in the correct order.

Please bear in mind, the exact contents of the `values` field will vary depending on the specific configurations you want to set for the `fmtok8s-tickets-service`. Be sure to check the chart's `values.yaml` for the configuration options it supports.

Lastly, if the service is exposed externally via LoadBalancer and you wish to obtain the external IP, you can export this information as shown in the `serviceUrl` export line. Note that the properties you access in the `getResourceProperty` method must correspond to what is actually defined and exposed by the Helm chart via its Kubernetes Service resource.