Deploy the tt-workflow helm chart on Kubernetes

Question

Pulumi · Accepted Answer

To deploy a Helm chart on Kubernetes using Pulumi, you would typically use the `Chart` resource from the `@pulumi/kubernetes` package. This package provides a way to declare Kubernetes resources, including those defined by Helm charts, using Pulumi's infrastructure as code approach.

Below is a sample program in TypeScript that demonstrates how to deploy a Helm chart named `tt-workflow` onto a Kubernetes cluster. Before you use the following code, make sure you have Pulumi and the appropriate provider SDK installed, and you're logged into a Kubernetes cluster where you have permissions to deploy resources.

First, we import the necessary Pulumi package for Kubernetes. We then create a new chart instance by specifying the chart name, version (if needed), and any custom values you wish to provide to the chart. Helm charts often come with default values, but most charts allow you to override these values with your own. These could be things like the number of replicas to deploy, image versions, or resource constraints.

The `kubernetes.helm.v3.Chart` resource will communicate with your Helm CLI to fetch and deploy the Helm chart into your Kubernetes cluster. Pulumi will manage the state of your deployment and execute any updates or deletions as needed in response to changes in your code.

Here's how you could deploy the `tt-workflow` Helm chart:

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

// Create a Helm Chart resource specifying the 'tt-workflow' chart.
const ttWorkflowChart = new kubernetes.helm.v3.Chart("tt-workflow", {
    // Specify the repository options for the Helm chart.
    // If it's a chart from a public repository, provide the repo URL here.
    // You might need to add `repo` key with the URL of the chart repository.
    chart: "tt-workflow",
    // Specify the namespace for the Helm chart.
    // If not specified, Helm and Kubernetes will use the 'default' namespace.
    namespace: "default",
    // Optionally, you can provide a version for the chart.
    // Useful for ensuring consistent deployments across environments.
    // version: "1.2.3",
    // Custom values for the Helm chart can be specified here.
    // values: {
    //   key: "value",
    // },
    // If the chart depends on a repo not present, you could fetch the repository using fetchOpts.
    /*fetchOpts: {
        repo: "http://charts.example.com/",
    },*/
});

// Export the base URL for the deployed tt-workflow service, if applicable.
// This assumes that the Helm chart creates a Kubernetes Service with a LoadBalancer.
// If your specific chart does not create a Service or you need a different URL,
// you may need to adjust the below accordingly.
const frontendService = ttWorkflowChart.getResource("v1/Service", "tt-workflow-frontend");
export const frontendUrl = frontendService.status.loadBalancer.ingress[0].hostname;
```

The program above does the following:
- Imports the Kubernetes package from Pulumi for TypeScript.
- Creates a Helm Chart resource for deploying the `tt-workflow` chart into the specified namespace in Kubernetes.
- Exports the URL for the `tt-workflow` service, assuming the chart includes a LoadBalancer service type for its frontend.

Remember to replace the place-holder comments with actual values specific to the `tt-workflow` chart and your Kubernetes cluster's architecture. Most Helm charts have documentation providing values that can be overridden. Make sure to consult the documentation for the `tt-workflow` chart for any specific needs.

Please note that this is a generic template and might need to be adjusted based on the specifics of the `tt-workflow` chart and its dependencies. For more information on using the Pulumi Kubernetes provider and the Helm Chart resource, you can read the [Pulumi documentation](https://www.pulumi.com/docs/reference/pkg/kubernetes/helm/v3/chart/).