Deploy the remark42 helm chart on Google Kubernetes Engine (GKE)

Question

Pulumi · Accepted Answer

To deploy the `remark42` Helm chart on Google Kubernetes Engine (GKE), you will first need to create a GKE cluster, and then use Pulumi's `helm.v3.Chart` resource to manage the deployment of the Helm chart.

Here is a step-by-step guide on how you can accomplish this using Pulumi with TypeScript:

1. **Set Up Your GKE Cluster**: You will use the `google-native.container/v1beta1.Cluster` resource to create a new Kubernetes cluster in GKE. This involves specifying the details of the cluster such as its name, the description, and node configuration.

2. **Deploy the Remark42 Helm Chart**: Once you have a Kubernetes cluster up and running, you can deploy the `remark42` Helm chart using Pulumi's `kubernetes.helm.v3.Chart` resource. This resource abstracts Helm's operations like `helm install` and `helm update`.

Here is the TypeScript program that performs these steps:

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

// Step 1: Set Up Your GKE Cluster
const cluster = new gcp.container.Cluster("remark42-gke-cluster", {
    initialNodeCount: 1,
    nodeVersion: "latest",
    minMasterVersion: "latest",
    nodeConfig: {
        machineType: "n1-standard-1",
        oauthScopes: [
            "https://www.googleapis.com/auth/compute",
            "https://www.googleapis.com/auth/devstorage.read_only",
            "https://www.googleapis.com/auth/logging.write",
            "https://www.googleapis.com/auth/monitoring",
        ],
    },
});

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

// Step 2: Configure K8s provider to deploy the Helm chart using the GKE cluster credentials
const k8sProvider = new k8s.Provider("remark42-k8s", {
    kubeconfig: cluster.kubeConfigRaw,
});

// Step 3: Deploy the remark42 Helm chart
const remark42Chart = new k8s.helm.v3.Chart("remark42", {
    chart: "remark42",
    // Replace with the repository that hosts the remark42 chart if it's not in the default repo
    fetchOpts: {
        repo: "https://path-to-remark42-helm-repo/",
    },
}, { provider: k8sProvider });

// Export the Helm chart deployment status
export const remark42DeploymentName = remark42Chart.status.apply(status => status.name);
```

**What this program does:**

1. Initialize a new GKE cluster with a single node pool. The `initialNodeCount`, `nodeVersion`, `minMasterVersion`, and `nodeConfig` parameters define the configuration of the cluster's nodes. The `oauthScopes` provide the nodes with the required permissions.

2. Define a Kubernetes provider to interact with the created GKE cluster. The `kubeconfig` is retrieved from the GKE cluster, which is used by the provider to authenticate with the Kubernetes cluster.

3. Deploy the `remark42` Helm chart to your GKE cluster. You specify the Helm chart's name and the repository where it is located. The `{ provider: k8sProvider }` option ensures that the Helm chart is deployed using the credentials from the GKE cluster created above.

**Exported Outputs:**

- `clusterName`: The name of the created GKE cluster which you can use to reference the cluster in the future.
- `remark42DeploymentName`: The name of the running Helm chart deployment for `remark42`. This may be useful for checking the status and managing the deployment later on.

**Prerequisites:**

- Make sure you have Pulumi installed and configured for use with GCP.
- Ensure that you are authenticated with GCP and have the necessary permissions to create resources in GKE.

After writing the code above, you can run it using Pulumi CLI commands:

- `pulumi up`: Preview and deploy changes.
- `pulumi stack output`: See the exported outputs.
- `pulumi destroy`: Tear down all resources.

_Remember to replace the placeholder for the chart repository ('https://path-to-remark42-helm-repo/') with the actual URL to the remark42 Helm chart repository if it is hosted outside the default Helm chart repositories._

This program provides a foundation to start with. You will need to adjust the `nodeConfig` and other parameters of the GKE cluster based on your application's specific needs and GCP quotas. Additionally, you might need to configure the `remark42` Helm chart with the appropriate values based on your desired configuration for the application.