Deploy the glowroot helm chart on Rancher

Question

Pulumi · Accepted Answer

To deploy the Glowroot Helm chart on Rancher, you would typically follow these steps:

1. **Setting up Rancher**: Ensure that you have access to a Rancher server and have a Kubernetes cluster registered with Rancher.
2. **Adding Helm Chart Repository in Rancher**: The repository containing the Glowroot Helm chart must be added to the Rancher catalog.
3. **Deploying Helm Chart through Rancher**: Use Rancher to deploy the Glowroot Helm chart to the desired Kubernetes cluster.

For the purpose of deploying the Helm chart through code, you can use Pulumi with the `rancher2` provider. Pulumi allows you to define infrastructure as code using familiar programming languages.

Below is a TypeScript program that demonstrates how you might use Pulumi to automate the deployment of the Glowroot Helm chart on a Kubernetes cluster managed by Rancher. The `rancher2` provider is used for integrating with Rancher.

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

// The code assumes that you have configured Pulumi to authenticate with Rancher
// and have specified the Rancher cluster where resources should be deployed.

// First, we need to add a catalog in Rancher for the repository containing the Glowroot Helm chart.
const catalog = new rancher2.CatalogV2("glowroot-catalog", {
    // Replace with the URL of the repository containing the Glowroot Helm chart
    url: "https://helm-repo.com/charts",
    clusterId: "your-cluster-id", // Specify your cluster ID here
    gitBranch: "master",
    // You can provide additional configuration if necessary
});

// Once the catalog is added, we deploy the Glowroot Helm chart.
// The Helm chart is a Kubernetes object, so we'll use Pulumi's Kubernetes provider to manage it.
// Make sure the k8s provider is configured to point to the same Kubernetes cluster managed by Rancher.
const chart = new k8s.helm.v3.Chart("glowroot-chart", {
    chart: "glowroot",
    // Specify the version of the Glowroot Helm chart if necessary
    // version: "x.x.x",
    fetchOpts: {
        // Here we use the catalog URL created earlier as our repo URL
        repo: catalog.url.apply(url => url),
    },
    // Provide values for the Helm chart if necessary
    // For example, you could specify a custom service type, image versions, resource limits, etc.
    values: {
        // service: {
        //     type: "LoadBalancer",
        // },
        // ...
    },
    // Set the namespace where you want to deploy the Helm chart
    namespace: "your-namespace",
}, {dependsOn: catalog});

// With the Helm chart installed, you can choose to export any resulting resource properties
// For example, if the chart creates a LoadBalancer service, you might want to export the endpoint
export const glowrootEndpoint = chart.getResourceProperty("v1/Service", "glowroot-service", "status")
    .apply(status => status.loadBalancer.ingress[0].hostname || status.loadBalancer.ingress[0].ip);
```

In this program, we use two main resources:

- `rancher2.CatalogV2`: This component is used to add a new Helm chart repository to the Rancher catalog. You'll need to set the `url` property to the location of the Helm chart repository that contains Glowroot. The `clusterId` must be set to the ID of the Rancher-managed Kubernetes cluster where the chart will be installed.
  
- `k8s.helm.v3.Chart`: This component represents a Helm chart that you want to install on the cluster. You set the `chart` name to `glowroot`, which should match the name of the Glowroot chart in the repository. The chart's `values` object will be populated with any configuration overrides you might need for the chart. Since Helm charts can create various Kubernetes resources, you can extract resource properties and expose them as Pulumi stack exports.

Please ensure you have the correct URL of the Helm repository and that you replace placeholders like `your-cluster-id` and `your-namespace` with actual values from your setup. The program also assumes that you have a configured Pulumi Kubernetes provider. If Glowroot required a specific version of Helm or any special configurations, those will also need to be provided.

If you want to learn more about the resources used here, please consult the Pulumi documentation for [Rancher2](https://www.pulumi.com/registry/packages/rancher2/) and [Kubernetes](https://www.pulumi.com/registry/packages/kubernetes/).