Deploy the springboot helm chart on Rancher

Question

Pulumi · Accepted Answer

Deploying a Helm chart on a Rancher-managed Kubernetes cluster with Pulumi is a two-step process:

1. Setting up the Rancher cluster (if not already available).
2. Deploying the Helm chart on the cluster.

For the sake of this example, let's assume you already have a Rancher-managed cluster available. Thus, we will focus on deploying a Spring Boot Helm chart to this cluster.

To deploy the Helm chart, we will use the `rancher2` package which provides a Pulumi provider for managing Rancher. Specifically, we'll take advantage of the Helm chart resource within that provider to deploy a Spring Boot application.

First of all, you'll need to install the `@pulumi/rancher2` package, which provides the Rancher 2 provider. You can do this by running `npm install @pulumi/rancher2`.

Here is the TypeScript program that shows how to deploy a Spring Boot Helm chart using Pulumi:

```typescript
import * as pulumi from '@pulumi/pulumi';
import * as rancher2 from '@pulumi/rancher2';

// Reference to your existing Rancher cluster
const clusterId = 'my-cluster-id'; // Replace with your actual cluster ID

// Deploy the Spring Boot Helm chart
const springBootHelmChart = new rancher2.AppV2('spring-boot-app', {
    // Specify the cluster ID where the chart should be deployed
    clusterId: clusterId,
    // Specify the relevant namespace within the cluster for deployment, create one if needed
    namespace: 'default',
    // Define the Helm chart details
    chart: {
        // Repository where your Helm chart is located
        repo: 'https://kubernetes-charts.storage.googleapis.com/',
        chart: 'spring-boot',
        // Specify the version of the Helm chart you want to deploy
        version: '1.0.0', // Replace with the version you need
    },
    // Provide the values for the Helm chart here
    values: {
        someParameter: 'someValue', // Replace with your Spring Boot application's parameters
        // For instance, for Spring Boot, this might include application properties or resource requests/limits.
    },
});

// Export the URL of the Spring Boot application, assuming it's a web application and the chart exposes it
export const appUrl = pulumi.interpolate`http://${springBootHelmChart.status['loadBalancer']['ingress'][0]['hostname']}/`;
```

Before you run this code, please ensure that you have the following:
- Installed Pulumi CLI and set up the appropriate cloud provider.
- Installed Node.js and NPM.
- Access to an existing Rancher-managed Kubernetes cluster and appropriate cluster ID.

This program assumes:
- The Helm chart is available in a public or private repository (here it's specified as a URL, but you'll need to replace it with the actual location of your Spring Boot Helm chart).
- You want to deploy the chart in the default namespace, which can be changed as required.
- The chart has available values that you can override and you have provided sample values here. You'll need to replace them with actual values based on your Spring Boot application's configuration needs.
- The Spring Boot application exposes a web service, and you want to export the URL. The `appUrl` will give you the ingress URL of your service, assuming the Helm chart correctly sets up a LoadBalancer and the ingress resource.

To apply this Pulumi program and deploy the chart, you would run `pulumi up` in the directory with this code, after logging in to your Pulumi account.

Please replace placeholders such as `my-cluster-id`, `'1.0.0'`, and `someParameter` with actual values corresponding to your setup before running the program.