Deploy the php-stack helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy a PHP stack Helm chart on DigitalOcean's Kubernetes Service using Pulumi, you'll need to perform a series of steps including creating a DigitalOcean Kubernetes cluster, installing the Helm CLI, and deploying the Helm chart to the cluster. Below I'll provide a comprehensive guide and the Pulumi TypeScript program to help you through this process.

1. **Create a DigitalOcean Kubernetes Cluster**: The first step is to create a DigitalOcean Kubernetes cluster where your applications will be running.

2. **Install Helm CLI**: Helm is a package manager for Kubernetes, which simplifies deployment of applications. The Helm CLI is required to manage the Helm charts.

3. **Deploy the PHP Stack Helm Chart**: Once Helm is set up and the Kubernetes cluster is ready, you deploy the PHP stack using a Helm chart. Helm charts are the packages that contain all the needed resources to deploy an application, or a set of related applications, onto a Kubernetes cluster.

### Prerequisites
- Ensure you have Pulumi installed.
- Ensure the Pulumi CLI is configured with your DigitalOcean token.
- Install Node.js and npm if they are not already installed.
- Install the Helm CLI on your system.
  
### Pulumi TypeScript Program
Below is the Pulumi program that performs the required operations to deploy a PHP stack Helm chart on DigitalOcean Kubernetes Service.

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

// Step 1: Create a DigitalOcean Kubernetes cluster
const cluster = new digitalocean.KubernetesCluster("do-cluster", {
    region: "nyc1", // Choose the region that is suitable for you
    version: "latest", // Set the version of Kubernetes you want to use
    nodePool: {
        name: "default",
        size: "s-2vcpu-2gb", // Choose the size that fits your need
        nodeCount: 2, // The number of nodes in the pool
    },
});

// Step 2: Use the cluster credentials to configure the Kubernetes provider
const provider = new kubernetes.Provider("do-k8s-provider", {
    kubeconfig: cluster.kubeConfigs[0].rawConfig,
});

// Step 3: Deploy the PHP stack using the Helm chart
const phpStackChart = new kubernetes.helm.v3.Chart("php-stack", {
    chart: "php-stack",
    version: "1.0.0", // Replace with the version of the chart you wish to deploy
    fetchOpts: {
        repo: "https://charts.example.com/", // Replace with the actual Helm chart repository URL
    },
}, { provider: provider });

// Export the cluster's kubeconfig
export const kubeconfig = cluster.kubeConfigs[0].rawConfig;

// Export the PHP stack service details
export const phpStackService = phpStackChart.getResource("v1/Service", "my-php-stack-service");
```

### Explanation
- **DigitalOcean Kubernetes Cluster**: The `digitalocean.KubernetesCluster` resource declares a new Kubernetes cluster in your DigitalOcean account with specified parameters like region, version, and node pool configuration.

- **Kubernetes Provider**: The `kubernetes.Provider` resource is used to interact with the newly created Kubernetes cluster using its configuration.

- **PHP Stack Helm Chart**: The `kubernetes.helm.v3.Chart` resource deploys a Helm chart into your Kubernetes cluster. You'll need to specify the `chart` and `version` of the PHP stack Helm chart you want to deploy, along with `fetchOpts.repo`, which should point to the chart's repository URL.
  
  Additionally, the `provider` argument ensures that the Helm chart will be deployed to the newly created DigitalOcean Kubernetes cluster.

- **Exports**: Finally, this code exports the kubeconfig, which is necessary to access the Kubernetes cluster from your local machine using `kubectl`. It also exports service details for the PHP stack, which can be used to access the application.

### Post-Deployment Steps
- After running this Pulumi program, the output will provide you with a kubeconfig. Save this as a file to access your cluster using `kubectl`.
- To view the services and access your PHP stack, you can use `kubectl get services` with the provided kubeconfig.

Deploying a PHP stack as a Helm chart on DigitalOcean Kubernetes Service with Pulumi is an effective way to manage your cloud native applications, making use of Pulumi's programming model and the powerful packaging of Helm.