Deploy the ublhub helm chart on Google Kubernetes Engine (GKE)

Question

Pulumi · Accepted Answer

To deploy the `ublhub` Helm chart on Google Kubernetes Engine (GKE), you will need to follow these steps:

1. **Create a GKE Cluster**: A Kubernetes cluster hosted on GKE provides the environment where your applications will run. The `gcp.container.Cluster` resource in Pulumi allows you to define the configuration of your GKE cluster.

2. **Install and Configure Helm**: Helm is a package manager for Kubernetes that allows you to define, install, and upgrade complex Kubernetes applications. The `harness.service.Helm` resource represents a Helm release, which is an instance of a Helm chart running in a Kubernetes cluster.

3. **Deploy the Helm chart**: You will need to specify the `ublhub` chart and set necessary parameters according to your application's needs.

Below is a TypeScript program that illustrates how to perform these steps using Pulumi.

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

const name = "ublhub-cluster";
const project = gcp.config.project;
const zone = "us-central1-a"; // You can change this to the preferred GCP zone.

// Step 1: Create a GKE Cluster
const cluster = new gcp.container.Cluster(name, {
    // Basic configuration for the GKE cluster
    initialNodeCount: 2,
    nodeVersion: "latest",
    minMasterVersion: "latest",
    location: zone,
    project: project,
});

// Export the Kubeconfig, which will be used to interact with the cluster
const kubeconfig = pulumi.
    all([cluster.name, cluster.endpoint, cluster.masterAuth]).
    apply(([name, endpoint, masterAuth]) => {
        const context = `${project}_${zone}_${name}`;
        return `apiVersion: v1
clusters:
- cluster:
    certificate-authority-data: ${masterAuth.clusterCaCertificate}
    server: https://${endpoint}
  name: ${context}
contexts:
- context:
    cluster: ${context}
    user: ${context}
  name: ${context}
current-context: ${context}
kind: Config
preferences: {}
users:
- name: ${context}
  user:
    auth-provider:
      config:
        cmd-args: config config-helper --format=json
        cmd-path: gcloud
        expiry-key: '{.credential.token_expiry}'
        token-key: '{.credential.access_token}'
      name: gcp
`;
    });

// Step 2: Set up the Kubernetes provider to use the created cluster's kubeconfig
const provider = new k8s.Provider(name, {
    kubeconfig: kubeconfig,
});

// Step 3: Deploy the ublhub Helm chart using the Kubernetes provider
const chart = new k8s.helm.v3.Chart("ublhub-chart", {
    chart: "ublhub",
    // Replace with the repository that contains the ublhub chart
    // or use an absolute path to the chart if it's locally available
    fetchOpts: {
        repo: "http://charts.example.com/repository",
    },
    // Specify any values you want to override, for example:
    // values: {
    //     serviceType: "LoadBalancer",
    // },
}, { provider });

// Export the Cluster's kubeconfig and Helm chart deployment status
export const kubeconfigOutput = kubeconfig;
export const chartStatus = chart.status;

```

This program completes the following actions:

- **Define a GKE cluster**: It creates a new GKE cluster (`gcp.container.Cluster`) with a specified name, location, node count, and version details. Adjust the `initialNodeCount`, `nodeVersion`, and `minMasterVersion` to suit your needs.
- **Create a kubeconfig File**: It constructs a kubeconfig file necessary to authenticate and interact with the cluster via `kubectl`.
- **Set up a Kubernetes provider with Pulumi**: This configures the Pulumi Kubernetes provider to manage resources in the newly created GKE cluster by using the kubeconfig.
- **Deploy a Helm Chart**: It deploys a Helm chart (`k8s.helm.v3.Chart`) with the name `ublhub`. You need to replace the `fetchOpts.repo` value with the actual repository URL of your Helm chart.

To execute this code:

1. **Set up the Pulumi stack**: Run `pulumi new gcp-typescript` to create a new Pulumi project configured for GCP and TypeScript.
2. **Install Dependencies**: Run `npm install @pulumi/pulumi @pulumi/gcp @pulumi/kubernetes` to install the necessary Pulumi packages.
3. **Copy the code into your `index.ts` file**: This is the main program file.
4. **Deploy the stack**: Run `pulumi up` to execute the Pulumi program and deploy the resources to GCP.

This program assumes that you have already configured Pulumi to work with your GCP credentials and that the Helm chart `ublhub` is available in a remote repository. Adjust the Helm chart deployment properties to match the specific requirements of your application.