Deploy the springboot-app helm chart on Kubernetes

Question

Pulumi · Accepted Answer

To deploy a Helm chart onto a Kubernetes cluster using Pulumi, we will utilize the `Chart` resource from the `@pulumi/kubernetes` package. This allows you to specify the Helm chart you want to deploy along with its values configuration, which are specific to the Helm chart you are using.

In the case of deploying a `springboot-app` Helm chart, you would first need to ensure that you have:

1. A Kubernetes cluster running and accessible. This could be a local one like Minikube or Docker Desktop's Kubernetes cluster, or a hosted one on a cloud provider.
2. The Helm chart for your Spring Boot application available. Usually, this would be in a Helm repository, or you could have it locally.

We will assume you have these ready, and I'll show you the basic Pulumi TypeScript code to deploy the `springboot-app` chart onto your cluster.

Here's a detailed program that deploys a Helm chart named `springboot-app`:

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

// Create a Kubernetes namespace for the Spring Boot app if you want to isolate it within the cluster
const appNamespace = new k8s.core.v1.Namespace("springboot-namespace", {
    metadata: {
        name: "springboot-app-space" // the namespace name
    },
});

// Deploy the springboot-app Helm chart
const springbootAppChart = new k8s.helm.v3.Chart("springboot-app", {
    namespace: appNamespace.metadata.name, // deploying the chart into the newly created namespace
    chart: "springboot-app", // the name of the chart
    // If the Helm chart is available in a repository, uncomment and use the following lines:
    // repo: "http://your-helm-chart-repository.com/",
    // version: "1.0.0", // specify the exact chart version you want to deploy
    
    // For charts sourced from a local path, you would use 'path' parameter:
    // path: "./path-to-your-local-helm-chart",

// Values from the default values.yaml can be overridden as follows
    values: {
        // Provide your custom values here, for example:
        // service: {
        //     type: "LoadBalancer",
        // },
        // image: {
        //     repository: "my-repository/springboot-app",
        //     tag: "latest",
        // },
    },
}, { provider: /* a Kubernetes Provider if not using the default one */ });

// Export the namespace and app details
export const namespace = appNamespace.metadata.name;
export const appName = springbootAppChart.metadata.name;

```

In this code, we have:

- Imported the necessary Pulumi Kubernetes library.
- Created a Kubernetes namespace. Namespaces are a way to divide cluster resources between multiple users via resource quota.
- Defined a new Helm `Chart` resource which represents the `springboot-app` application to be deployed. We're assuming this Helm chart exists either in a Helm repository or locally. You should specify the chart repository and version if you aren't using a local chart.
- Optionally provided custom values by specifying them in the `values` field if you need to override default values set in the chart's `values.yaml` file.

If the Helm chart is contained within a private repository or requires specific access credentials, you'll need to handle this in the Helm chart's configuration (usually under `fetchOpts`). Additional configurations, such as custom resource options or transformations, can be passed to the `Chart` resource as the second argument.

Make sure the `chart` value matches the name of the chart you want to deploy, and adjust any values or configurations as needed for your specific Spring Boot application.

To apply your Pulumi configuration, follow these steps:

1. Save the TypeScript code to a file (`index.ts`) in a Pulumi project directory.
2. Ensure that your Kubernetes cluster is accessible via `kubectl`.
3. Run `pulumi up` from the command line inside the project directory to create the resources.

Note that Pulumi maintains state regarding your deployments, so you will be able to see changes and updates to your infrastructure over time with successive Pulumi commands.