Deploy the sonarqube-scanner helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

Deploying a Helm chart on a Kubernetes cluster involves several steps which include setting up the Kubernetes cluster itself, and then using Helm to deploy your application—in this case, the `sonarqube-scanner`. Below is a step-by-step guide written in TypeScript using Pulumi to accomplish these tasks on the Digital Ocean platform.

### Step 1: Set up a Digital Ocean Kubernetes Cluster
To get started with deploying any application on Kubernetes, you first need to have a Kubernetes cluster. The `digitalocean.KubernetesCluster` resource allows you to create and manage a Kubernetes cluster on Digital Ocean.

### Step 2: Deploy the Helm Chart
Once you have a Kubernetes cluster, the next step is to deploy your application using Helm, which is a package manager for Kubernetes. In Pulumi, you can deploy a Helm chart using the `kubernetes.helm.v3.Chart` resource, allowing you to specify the chart name, version, and any custom values you need to pass to your chart.

### Pulumi Program to Deploy SonarQube Scanner Helm Chart
Below is a Pulumi program that sets up a Digital Ocean Kubernetes cluster and deploys the `sonarqube-scanner` Helm chart onto it.

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

// Step 1: Provision a Digital Ocean Kubernetes Cluster
const cluster = new digitalocean.KubernetesCluster("sonarqube-cluster", {
    region: "nyc1", // Choose the region that is closest to you or your users
    version: "latest",  // Use the latest available version of Kubernetes
    nodePool: {
        name: "default",
        size: "s-2vcpu-2gb", // Choose the size that meets your needs
        nodeCount: 2, // Adjust the node count according to your application's requirements
    },
});

// Step 1b: Export the kubeconfig file to interact with the cluster
export const kubeconfig = cluster.kubeConfigs[0].rawConfig;

// Step 2: Deploy the sonarqube-scanner Helm chart on the Kubernetes cluster
const sonarqubeScannerChart = new k8s.helm.v3.Chart("sonarqube-scanner", {
    chart: "sonarqube-scanner",  // The name of the chart
    version: "1.0.0", // Specify the version of the chart you want to deploy
    fetchOpts: {
        repo: "https://charts.your-repo.com/",  // Replace with the actual Helm chart repo containing sonarqube-scanner
    },
    values: {
        // Place your custom values here, for example:
        image: {
            tag: "latest", // Use the version of the image you want to deploy
        },
        // Add any additional chart values you need
    },
}, {provider: new k8s.Provider("k8s-provider", {kubeconfig: cluster.kubeConfigs[0].rawConfig})});

// Step 2b: Export the sonarqube service endpoint
export const sonarqubeServiceEndpoint = sonarqubeScannerChart.getResourceProperty("v1/Service", "sonarqube-scanner", "status");

```

### Explanation of the Pulumi Program

- We import the required Pulumi packages for Digital Ocean and Kubernetes.
- We create a new Digital Ocean Kubernetes cluster by instantiating `digitalocean.KubernetesCluster`.
- We provide configuration parameters like the region, Kubernetes version, and details about our node pool.
- We export the `kubeconfig` which allows you to interact with your Kubernetes cluster using `kubectl` or other Kubernetes tooling.
- We then create a new Helm chart resource, specifying the name and version of the `sonarqube-scanner` chart we wish to deploy, and providing a reference to the Helm chart repository.
- We pass a set of custom values to the chart via the `values` field to customize the deployment.
- We create a new instance of `k8s.Provider` which is necessary for Pulumi to communicate with the newly created Kubernetes cluster.
- We export the service endpoint of the deployed `sonarqube-scanner` which you can use to access the application.

### Next Steps
After running this Pulumi program, the Digital Ocean Kubernetes cluster would be set up, and the `sonarqube-scanner` Helm chart would be deployed on it. You can then use the `kubeconfig` to manage your cluster using `kubectl`, and access the `sonarqube-scanner` service using the outputted endpoint.

To run the Pulumi program, you would save it to a file (e.g., `index.ts`), execute `pulumi up`, and follow the on-screen instructions to provision and deploy the resources defined in the program. Remember that you'll need the Pulumi CLI installed and configured, as well as Digital Ocean access set up with required credentials.