Deploy the trino-loadbalancer helm chart on Rancher

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Pulumi · Accepted Answer

To deploy the `trino-loadbalancer` Helm chart on Rancher using Pulumi, you will follow these general steps:

1. **Set up a Kubernetes cluster using Rancher**: Before installing Helm charts, you need a Kubernetes cluster managed with Rancher. Pulumi provides the `rancher2.Cluster` resource for creating a cluster in Rancher.

2. **Create a Namespace**: Helm charts should be installed in a specific namespace. Use the `rancher2.Namespace` resource to create a new Kubernetes namespace in your Rancher cluster.

3. **Deploy Helm Chart**: Using the `pulumi/kubernetes` package, you can deploy Helm charts with the `kubernetes.helm.v3.Chart` resource.

Before proceeding, ensure that you have installed Pulumi and configured it with the necessary cloud provider credentials. Also, make sure you have set up Rancher and that you can access it with your API keys.

Below is a Pulumi program in TypeScript that demonstrates how to deploy a Helm chart on Rancher. This program assumes you already have a Rancher cluster provisioned and accessible.

```typescript
import * as rancher2 from "@pulumi/rancher2";
import * as k8s from "@pulumi/kubernetes";

// Replace these variables with real values
const rancherClusterName = "my-rancher-cluster";
const helmChartName = "trino-loadbalancer";
const helmChartVersion = "x.y.z"; // specify the chart version
const namespaceName = "trino-namespace";

// Step 1: Retrieve the Rancher cluster
// Documentation: https://www.pulumi.com/registry/packages/rancher2/api-docs/cluster
const cluster = rancher2.Cluster.get('cluster', rancherClusterName);

// Step 2: Create a Namespace in Rancher for the Helm chart
// Documentation: https://www.pulumi.com/registry/packages/rancher2/api-docs/namespace
const namespace = new rancher2.Namespace("trino-namespace", {
    name: namespaceName,
    clusterId: cluster.id,
});

// Initialize the Kubernetes provider using the retrieved Rancher cluster kubeconfig
const k8sProvider = new k8s.Provider("k8s-provider", {
    kubeconfig: cluster.kubeConfig,
});

// Step 3: Deploy the trino-loadbalancer Helm chart to the Rancher cluster
// Documentation: https://www.pulumi.com/docs/reference/pkg/kubernetes/helm/v3/chart
const trinoHelmChart = new k8s.helm.v3.Chart(helmChartName, {
    chart: helmChartName,
    version: helmChartVersion,
    namespace: namespace.name,
}, { provider: k8sProvider });

// Export the kubeconfig to access the cluster
export const kubeconfig = cluster.kubeConfig;
```

Here is what the each part of the code does:

- **Retrieves the existing Rancher cluster**: Before deploying anything, the program retrieves the existing Rancher cluster to work with it.

- **Creates a new namespace**: A new Kubernetes namespace within the Rancher cluster is created specifically for the Trino LoadBalancer deployment. It ensures that all resources created by the Helm chart are grouped together and can be managed easily.

- **Sets up the Kubernetes provider**: The Pulumi Kubernetes provider is initialized using the kubeconfig obtained from the Rancher cluster. This allows Pulumi to interact with the Kubernetes API server managed by Rancher.

- **Deploys the Helm chart**: The `trino-loadbalancer` Helm chart is deployed to the Rancher managed cluster under the created namespace using the Pulumi Kubernetes provider.

- **Exports the kubeconfig**: You might want to interact with your Kubernetes cluster later on using `kubectl`. The kubeconfig is exported for convenience.

Make sure to replace the placeholders with actual values relevant to your Rancher setup and the Helm chart you want to deploy.

After your Pulumi program is ready, you can run it using the following Pulumi CLI commands:

```
pulumi up
```

This will preview the changes and prompt you to continue with the deployment. If everything looks correct, confirm the deployment, and Pulumi will start the provisioning process. After a successful deployment, Pulumi will output any exported values, such as your cluster's kubeconfig.