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

Question

Pulumi · Accepted Answer

To deploy the JuiceFS Helm chart on Google Kubernetes Engine (GKE), we'll break down the process into a few steps:

1. **Set up GKE cluster**: We'll create a GKE cluster using Pulumi's `google-native.container/v1beta1.Cluster` resource. This will give us a Kubernetes cluster in GCP where we can deploy applications.
   
2. **Install the Helm chart**: With the cluster up and running, we'll use Pulumi's `kubernetes.helm.sh/v3.Release` resource to install the JuiceFS Helm chart on our GKE cluster.

Let's start by creating a Pulumi program in TypeScript that accomplishes these tasks.

### Setting up the Pulumi Project

Before writing the Pulumi code, ensure you have the following prerequisites in place:
- Pulumi CLI installed and configured with a Google Cloud project and GCP credentials.
- `gcloud` CLI installed and configured with your credentials and active project.
- `kubectl` CLI installed to interact with the Kubernetes cluster.

### Pulumi TypeScript Program

The following TypeScript program encapsulates both creating a GKE cluster and deploying the JuiceFS Helm chart onto it.

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

// Initialize a new Pulumi project using `pulumi new gcp-typescript`

// Step 1: Create a GKE cluster
const cluster = new gcp.container.Cluster("juicefs-cluster", {
    initialNodeCount: 2,
    nodeVersion: "latest",
    minMasterVersion: "latest",
    // Define other required properties such as location, nodeConfig, etc. based on your needs
});

// Export the Cluster name and Kubeconfig
export const clusterName = cluster.name;
export const kubeconfig = cluster.endpoint.apply(endpoint => {
    const context = `${gcp.config.project}_${gcp.config.zone}_${cluster.name}`;
    return `apiVersion: v1
clusters:
- cluster:
    certificate-authority-data: ${cluster.masterAuth.clusterCaCertificate}
    server: https://${endpoint}
  name: ${context}
contexts:
- context:
    cluster: ${context}
    user: ${context}
  name: ${context}
current-context: ${context}
kind: Config
preferences: {}
users:
- name: ${context}
  user:
    auth-provider:
      config:
        cmd-args: config config-helper --format=json
        cmd-path: gcloud
        expiry-key: '{.credential.token_expiry}'
        token-key: '{.credential.access_token}'
      name: gcp
`;
});

// Step 2: Deploy the JuiceFS Helm chart on GKE cluster
const juicefsChart = new k8s.helm.v3.Chart("juicefs", {
    chart: "juicefs",
    fetchOpts: {
        repo: "https://juicedata.github.io/juicefs-csi-driver/",
    },
    // Provide values for any required JuiceFS configuration options
    values: {
        // Example JuiceFS settings, replace with actual configuration.
        namespace: "default",
        // Add other necessary values.
    },
}, { provider: new k8s.Provider("k8s-provider", { kubeconfig: kubeconfig }) });

// Export the Helm Release status
export const juicefsStatus = juicefsChart.status;
```

**Explanations:**
- We import `gcp` and `k8s` packages which contain the necessary classes for GCP and Kubernetes resources.
- We create a new GKE cluster with the required node count and versioning details.
- Once we have the cluster, we generate a `kubeconfig` file that will be used by `kubectl` to communicate with our GKE cluster.
- We then use that `kubeconfig` to set up a Kubernetes provider for Pulumi. This provider is necessary for Pulumi to interact with our cluster.
- Using the `kubernetes.helm.v3.Chart` resource, we specify the JuiceFS chart we want to deploy. We point to the correct repository for JuiceFS and can set configuration values as needed.

**Ensure you replace the placeholder values and configurations with those that align with your specific deployment goals and GKE configurations.**

To run this program:
1. Make sure you have Pulumi installed and the GCP plugin is configured with your GCP credentials.
2. Save the above TypeScript code to a file `index.ts`.
3. Run `pulumi up`, which will review the proposed changes and prompt you to proceed with the deployment.

After successful deployment, the `juicefs` Helm chart will be deployed onto your GKE cluster, and your JuiceFS file system will be ready to be mounted as a persistent volume in Kubernetes.