Deploy the php-stack helm chart on Linode Kubernetes Engine

Question

Pulumi · Accepted Answer

To deploy a PHP stack Helm chart on Linode Kubernetes Engine using Pulumi, we will take the following steps:
1. Set up the Linode Kubernetes Engine (LKE) cluster.
2. Deploy the PHP stack Helm chart onto the LKE cluster.

We will use the `@pulumi/linode` provider to create an LKE cluster. After we have our cluster up, we will utilize the `@pulumi/kubernetes` provider to deploy a Helm chart which contains our PHP application stack. This Helm chart could include configurations for PHP along with any other required services like a web server (e.g., Apache or Nginx) and a database (e.g., MySQL).

Before running the Pulumi program, you will need to have the Pulumi CLI installed and have an account set up with Linode. You'll also need to have configured Pulumi to use your Linode API token, which can be done through the CLI with `pulumi config set linode:token YOUR_LINODE_API_TOKEN_HERE`.

Here is a detailed TypeScript program to achieve this:

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

// As a first step we need to create a Linode Kubernetes Engine cluster
const cluster = new linode.LkeCluster("my-php-cluster", {
    label: "my-php-cluster",
    k8sVersion: "1.18",
    region: "us-central",
    tags: ["pulumi-lke"],
    pool: {
        type: "g6-standard-2",
        count: 3, // The number of nodes in the node pool, 3 is just an example.
    },
});

// Here we are creating a kubeconfig that will allow us to interact with our LKE cluster
// This is a sensitive value and should be handled with care
const kubeconfig = cluster.kubeconfig.apply(kubeconfig => {
    // Optional step: You might want to write this kubeconfig to a local file to use with `kubectl` command locally
    // require('fs').writeFileSync('kubeconfig.yaml', kubeconfig)
    return kubeconfig;
});

// Now that we have our K8s cluster, we can create a Helm chart release using the `@pulumi/kubernetes` provider
// The Helm chart we deploy should contain the PHP stack. For this example, let's assume there's a Helm chart available in a Helm repo
const phpStackChart = new kubernetes.helm.v3.Chart("my-php-stack", {
    chart: "php-stack", // The name of the chart. Replace with the actual chart name
    version: "1.2.3", // Replace with the actual chart version
    fetchOpts: {
        repo: "http://example.com/helm-charts", // Replace with the actual Helm chart repository URL
    },
}, { provider: new kubernetes.Provider("k8s-provider", { kubeconfig }) });

// Export the Cluster's kubeconfig and the PHP Stack Helm chart deployment's status
export const kubeconfigOutput = cluster.kubeconfig;
export const phpStackStatus = phpStackChart.status;
```

This Pulumi program defines the Linode Kubernetes Engine cluster with a single node pool consisting of 3 nodes (which is a number chosen for this example; adjust based on your actual requirements). It then deploys a PHP stack using a Helm chart. Make sure you replace `"php-stack"`, `"1.2.3"`, and the Helm repo URL (`"http://example.com/helm-charts"`) with the actual Helm chart information for your PHP stack.

The kubeconfig of the created cluster is exported so that you can interact with the cluster using `kubectl` if necessary. We also export the status of the Helm chart deployment.

As a final step, you would run `pulumi up` in your terminal within the directory of your Pulumi project to execute this Pulumi program. Pulumi will show you a preview of what will be deployed. Upon confirmation, Pulumi will provision the LKE cluster and deploy your PHP stack Helm chart onto it.