Deploy the java helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy a Java Helm chart on the DigitalOcean Kubernetes Service using Pulumi, you'll first need to create a Kubernetes cluster on DigitalOcean. Once the cluster is up and running, you can deploy the Java Helm chart by using the Pulumi Kubernetes provider which wraps Helm functionality.

Below is a step-by-step guide and a Pulumi TypeScript program that accomplishes this. Please make sure you have the Pulumi CLI installed and configured to access your DigitalOcean account before running the Pulumi code.

### Step-by-step Guide:

1. **Set up a Kubernetes Cluster**: Create a `KubernetesCluster` resource with DigitalOcean using the `digitalocean` package. Specify the desired node size, number of nodes, and region for your cluster.

2. **Install the Helm Chart**: Once the cluster is provisioned and available, use the `helm.sh/v3.Chart` resource from the `kubernetes` package to install the Java Helm chart onto your cluster.

3. **Export Required Information**: After your application is deployed, you might want to export some information, like the cluster endpoint or other data related to the Helm release.

Here is the program that accomplishes the above steps:

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

// Step 1: Create a Kubernetes cluster on DigitalOcean.
const cluster = new digitalocean.KubernetesCluster("do-cluster", {
    // Specify the region where your cluster will be created.
    region: "nyc1",
    // Specify the version of Kubernetes to install.
    version: "latest",
    // Configure the node pool where your workloads will run.
    nodePool: {
        name: "default",
        size: "s-1vcpu-2gb",
        nodeCount: 2, // Number of nodes in the node pool.
    },
});

// Step 2: Install the Helm chart using the Pulumi Kubernetes provider.
const javaHelmChart = new k8s.helm.v3.Chart("java-chart", {
    // Specify the chart details. Replace `repo` and `chart` with the actual Helm chart information.
    repo: "my-helm-chart-repo",
    chart: "my-java-chart",
    // Pass values to the chart for customizing the installation.
    // This is equivalent to providing a custom `values.yaml` file.
    values: {
        // Custom values required for the chart.
        // E.g., serviceType: "LoadBalancer",
    },
    // Attach the Helm chart to the created Kubernetes cluster.
    // This requires fetching the kubeconfig from the cluster resource.
    kubeConfig: cluster.kubeConfigs[0].rawConfig,
});

// Step 3: Export the information you might need to interact with your application.
export const kubeconfig = cluster.kubeConfigs[0].rawConfig;
export const chartVersion = javaHelmChart.version;
export const clusterEndpoint = cluster.endpoint;

// This Pulumi program will provision a DigitalOcean Kubernetes cluster and deploy
// a java application using a specified Helm chart to that cluster.
```

This Pulumi program can be executed by running `pulumi up` in the terminal from the folder where this file is saved. Make sure you authenticate with DigitalOcean and configure Pulumi to use your DigitalOcean token before executing the program.

Remember to replace `my-helm-chart-repo` and `my-java-chart` with the actual Helm repository and chart names for your Java application. Additionally, you might want to adjust the `values` object with the configuration specifics for your Java chart. The `values` object corresponds to the Helm `values.yaml` file which typically includes the deployment configuration like environment variables, service types, volume mounts, etc.

After successful deployment, the output will include the Kubernetes config needed to access your cluster (`kubeconfig`), the chart version deployed (`chartVersion`), and the cluster endpoint (`clusterEndpoint`) which you can use to interact with your deployed Java application.