Deploy the Wordress helm chart on Rancher

Question

Pulumi · Accepted Answer

Deploying a WordPress Helm chart on Rancher involves multiple steps. Pulumi allows for the automation of this deployment in a programmatic way using infrastructure as code. To accomplish this, we’ll take the following steps:

1. Provision a Kubernetes cluster in Rancher.
2. Deploy the WordPress Helm chart onto the cluster.

For the Kubernetes cluster, we will use the `rancher2.Cluster` resource. This is a Pulumi resource that represents a Rancher v2 Cluster and allows us to define the cluster's configuration and create it within Rancher.

Once the cluster is set up, we’ll deploy WordPress using the `helm.v3.Chart` resource from Pulumi's Helm package. The Helm release will install WordPress onto the Kubernetes cluster managed by Rancher.

Here's a TypeScript program that you can use with Pulumi to deploy the WordPress Helm chart on Rancher:

```typescript
import * as pulumi from "@pulumi/pulumi";
import * as rancher2 from "@pulumi/rancher2";
import * as k8s from "@pulumi/kubernetes";
import * as helm from "@pulumi/kubernetes/helm";

// Create a cluster in Rancher
const cluster = new rancher2.Cluster("wordpress-cluster", {
    // Assume that we want to create a cluster using the RKE (Rancher Kubernetes Engine)
    rkeConfig: {
        // Specify the cluster configuration here.
        // This example is purely illustrative; specific details will depend on your requirements
        // and the configuration of your underlying infrastructure.
    },
    // Add other required configurations for your Rancher setup
});

// Once the cluster is ready, get its kubeconfig.
const kubeconfig = pulumi.all([cluster.name, cluster.id]).apply(([name, id]) => {
    return rancher2.getKubeConfig({
        clusterId: id,
    });
});

// Create a Kubernetes provider instance that uses the kubeconfig from the created cluster
const k8sProvider = new k8s.Provider("k8s-provider", {
    kubeconfig: kubeconfig.kubeConfig,
});

// Deploy WordPress Helm chart on the Rancher-managed Kubernetes cluster using the newly created provider
const wordpress = new helm.v3.Chart("wp-chart", {
    chart: "wordpress",
    version: "9.0.3", // Use the correct chart version. You can get the latest from the Helm repository
    // Define values that will override the default helm chart values for WordPress.
    values: {
        mariadb: {
            auth: {
                rootPassword: "supersecretpassword", // Be sure to change this value and secure it
                // Other database config as per need
            },
        },
        wordpressUsername: "admin",
        wordpressPassword: "anotherSuperSecretPassword", // Be sure to change and secure this value
        // More WordPress-specific configurations
    },
}, { provider: k8sProvider });

// Export the WordPress service endpoint to access your deployment
export const wordpressEndpoint = wordpress.getResourceProperty("v1/Service", "wp-chart-wordpress", "status")
    .apply(status => `http://${status.loadBalancer.ingress[0].ip}/`);

```

Here we have defined two main resources:

1. `Cluster`: We are creating a Rancher cluster config using the `rancher2.Cluster`. Here we'd need to specify the actual configuration details about the RKE clusters such as node pools, networking, Kubernetes version, etc.

2. `helm.v3.Chart`: Deploys WordPress onto the provisioned Rancher Kubernetes cluster. The Helm chart for WordPress is set up with reasonable defaults, but we override some of these values, such as database passwords and WordPress admin credentials. It is paramount to handle these values securely in production environments.

Finally, we export the WordPress service endpoint using `export const wordpressEndpoint`, which will output the IP address or DNS name that you can use to browse your WordPress instance once it's up and running.

Please ensure you handle secret values such as database passwords and admin accounts securely, perhaps using a secret management system or Pulumi’s secret handling.

To run this Pulumi program, you would execute `pulumi up` in the directory where this code is saved. This command will compile the TypeScript code into JavaScript, spin up the necessary cloud resources, and deploy the Helm chart for WordPress onto the Rancher Kubernetes cluster you have provisioned.

Remember, before running `pulumi up`, be sure that your Pulumi CLI is installed and configured to communicate with your Rancher instance, and that you've installed necessary Node.js dependencies including `@pulumi/rancher2`, `@pulumi/kubernetes`, and `@pulumi/kubernetes/helm`.