Deploy the trino-loadbalancer helm chart on Opensshift

Question

Pulumi · Accepted Answer

To deploy the `trino-loadbalancer` Helm chart on OpenShift with Pulumi, you would typically follow these steps:

1. Set up a Pulumi project and stack.
2. Choose the right Pulumi provider for Kubernetes and OpenShift; since OpenShift is a Kubernetes distribution, we use the Kubernetes provider.
3. Write the code to apply the Helm chart to your OpenShift cluster.

Below is an explanation and a Pulumi TypeScript program that deploys the `trino-loadbalancer` Helm chart on OpenShift.

### Explanation

- **Setting Up Providers**: In Pulumi, Providers are responsible for understanding API interactions and exposing resources. For Kubernetes, the Kubernetes provider (`@pulumi/kubernetes`) is used to interact with any Kubernetes-compatible endpoint, such as OpenShift.
  
- **Applying a Helm Chart**: Applying a Helm chart is achieved using the `Chart` resource from the `@pulumi/kubernetes/helm/v3` module, which manages Helm chart installations.

- **Configuration**: You need to provide the configuration details of the Helm chart you want to deploy, such as its name (`trino-loadbalancer`), its version (if specific), and any custom `values` which override the defaults in the chart.
  
- **Cluster Access**: To deploy resources onto an OpenShift cluster, you must have access configured via `kubeconfig`. When running Pulumi from your local machine, it uses your local `kubeconfig` file just like `kubectl` does.

### Pulumi TypeScript Program

Let's write the program to deploy the `trino-loadbalancer` chart.

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

// Create an instance of the Kubernetes provider to communicate with the OpenShift cluster.
// Pulumi automatically uses the kubeconfig file from your local machine.
const k8sProvider = new k8s.Provider("openshift-k8s", {
    // Depending on your OpenShift configuration, you might need to specify additional provider settings,
    // such as `kubeconfig` explicitly if it's not located at the default `~/.kube/config` path.
});

// Define configuration for the 'trino-loadbalancer' Helm chart.
// You will need to specify the repository or chart path if it's not a standard Helm chart.
const trinoChart = new k8s.helm.v3.Chart("trino-loadbalancer", {
    chart: "trino-loadbalancer",
    // Replace `CHART_VERSION` with the actual version you wish to deploy, if you know it.
    // version: "CHART_VERSION",
    
    // Specify where to fetch the chart if it's not in the default Helm repos.
    // fetchOpts: {
    //     repo: "https://charts.example.com/",
    // },
    
    // Add any custom values you want to override in the Helm chart.
    // values: {
    //     key: "value",
    // },
}, { provider: k8sProvider });

// Export any necessary resources.
// For example, if your Helm chart creates a LoadBalancer service, you might export its endpoint.
export const trinoEndpoint = trinoChart.getResourceProperty(
    "v1/Service", "trino-loadbalancer-service", "status").apply(status => status.loadBalancer.ingress[0].ip);
```

### Explanation of the Program:

- We import the necessary Kubernetes module from Pulumi.
- We instantiate a Kubernetes provider, which Pulumi uses to act against the Kubernetes API (OpenShift in this scenario). This may require custom kubeconfig settings depending on your environment and how you've set up access to OpenShift.
- We define a new Helm chart using `Chart` from `@pulumi/kubernetes/helm/v3`. To successfully deploy the chart, you'd need to specify the correct chart name and optionally the version and repository.
- In the above example, we have commented out `fetchOpts` and `values`, which are placeholders for the Helm repository source and any values we wish to override in the Helm chart.
- The `trinoEndpoint` export is a Pulumi feature that allows you to extract information about resources created by the Helm chart. This depends on the actual services and resources created by the Helm chart and their corresponding properties.

Once you have written this code in a file (`index.ts`, for example), you would run it using Pulumi CLI commands `pulumi up` to create or update resources according to this program. Please ensure that you have set up access to your OpenShift cluster and have the Pulumi command-line tools installed.