Deploy the ceph-provisioners helm chart on Google Kubernetes Engine (GKE)

Question

Pulumi · Accepted Answer

Deploying a Helm chart on a Google Kubernetes Engine (GKE) cluster typically involves several steps:

1. **Create a GKE Cluster**: You would first need to create a GKE cluster where you want the Helm chart to be deployed.
   
2. **Helm Installation and Configuration**: Once the GKE cluster is up and running, Helm needs to be installed and configured to manage Kubernetes applications.

3. **Deploy Helm Chart**: After Helm is configured, you can then deploy the `ceph-provisioners` Helm chart onto the GKE cluster.

Using Pulumi to automate this, it would involve writing code that will define the desired state for each of these steps. Below is an example TypeScript program that shows how you could use Pulumi to create a GKE cluster and deploy the `ceph-provisioners` Helm chart onto that cluster.

Please ensure you have Pulumi installed and configured to access Google Cloud Platform before running this code.

First, let's write a detailed explanation of each part of the program:

- We will use the `@pulumi/gcp` package to create the GKE cluster.
- We will use the `@pulumi/kubernetes` package to interact with the Kubernetes API, which is needed for the deployment of the Helm chart.
- The `KubernetesProvider` resource is used to interact with the created GKE cluster specifically.
- The `helm.v3.Chart` resource is used to deploy the `ceph-provisioners` Helm chart using the configured Kubernetes provider.

Here's the Pulumi program written in TypeScript:

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

// Step 1: Create a GKE cluster
const cluster = new gcp.container.Cluster("my-gke-cluster", {
    initialNodeCount: 2,
    minMasterVersion: "latest",
    nodeVersion: "latest",
    nodeConfig: {
        machineType: "n1-standard-2", // or any other preferred machine type
        oauthScopes: [
            "https://www.googleapis.com/auth/cloud-platform",
            // oAuth scopes that are required by the `ceph-provisioners`
        ],
    },
});

// Export the Cluster name
export const clusterName = cluster.name;

// Step 2: Configure the Kubernetes provider using the created GKE cluster creds
const k8sProvider = new k8s.Provider("k8s-provider", {
    kubeconfig: cluster.kubeConfigRaw,
});

// Step 3: Deploy the `ceph-provisioners` helm chart using the Kubernetes provider
const cephProvisionersChart = new k8s.helm.v3.Chart("ceph-provisioners", {
    chart: "ceph-provisioners",
    // Specify the Helm chart version if needed
    // version: "<CHART_VERSION>",
    // Include any custom values file (yaml) or configuration needed
    // values: {...},
}, { provider: k8sProvider });

// Export the status of the Helm release
export const cephProvisionersStatus = cephProvisionersChart.status;
```

To run this program:

1. Save the code to a file named `index.ts`.
2. Run `pulumi up` from the command line to create the GKE cluster and deploy the Helm chart.

The output of the `pulumi up` command will show you a preview of the resources that Pulumi plans to create. If everything looks good, you can proceed to apply the changes.

Make sure you have the necessary permissions and roles granted in your GCP account for creating and managing GKE clusters, and that you've correctly set up your `gcloud` CLI and Pulumi configuration. Additionally, ensure Helm is available in your execution environment if you intend to modify or interact with Helm charts beyond the scope of this deployment.

Keep in mind that the `ceph-provisioners` Helm chart must be available in the Helm repository you're using, and it might require specific configuration options based on your cluster setup and needs.