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

If you're looking to deploy the Zeppelin helm chart on Google Kubernetes Engine (GKE), you'll go through a few key steps:

1. Create a GKE cluster where your applications will be running.
2. Configure kubectl to interact with the GKE cluster.
3. Use Helm to deploy the Zeppelin chart to your cluster.

Below is a Pulumi program written in TypeScript that accomplishes these steps:

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

// Create a GKE cluster
const cluster = new gcp.container.Cluster("zeppelin-cluster", {
    initialNodeCount: 2,
    nodeVersion: "latest",
    minMasterVersion: "latest",
    nodeConfig: {
        preemptible: true,
        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's kubeconfig
export const kubeconfig = pulumi.all([cluster.name, cluster.endpoint, cluster.masterAuth]).apply(([name, endpoint, masterAuth]) => {
    const context = `${gcp.config.project}_${gcp.config.zone}_${name}`;
    return `apiVersion: v1
clusters:
- cluster:
    certificate-authority-data: ${masterAuth.clusterCaCertificate}
    server: https://${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
`;
});

// Create a Kubernetes provider instance that uses our cluster from above.
const k8sProvider = new k8s.Provider("gkeK8s", {
    kubeconfig: kubeconfig,
});

// Deploy the Zeppelin helm chart using the Helm Chart resource.
const zeppelinChart = new k8s.helm.v3.Chart("zeppelin", {
    chart: "zeppelin",
    version: "0.1.0", // please replace with appropriate chart version
    fetchOpts: {
        repo: "http://zeppelin-helm-chart-repository/", // replace with Zeppelin helm chart's repository URL
    },
}, { provider: k8sProvider });

// Export the Zeppelin service endpoint
export const zeppelinEndpoint = zeppelinChart.getResourceProperty("v1/Service", "zeppelin-zeppelin", "status").apply(status => `http://${status.loadBalancer.ingress[0].ip}`);

Here's a breakdown of what's happening:

• We use the @pulumi/gcp package to create a new GKE cluster with some basic configurations such as node size and number of nodes, specifying the oauthScopes for default access to GCP services.

• The kubeconfig export gives you the configuration to connect to your newly created GKE cluster using kubectl or other Kubernetes tools. This configuration will use the cluster details and credentials automatically.

• We then create a new Pulumi Kubernetes provider configured to use the cluster's kubeconfig. This will be used to deploy the Helm charts to your cluster.

• Using @pulumi/kubernetes, we declare a new Helm chart resource representing the Zeppelin application. We specify the chart name, version, and repository URL where Pulumi can find the Helm chart. Pulumi will manage the release history and updates for this chart.

• We export the Zeppelin endpoint that will be the external IP address by which you can access the Zeppelin UI through the associated Kubernetes service. Typically Helm charts create a Service resource for accessing the application, here we assume it's named zeppelin-zeppelin, but you'll need to adjust that according to the actual service name created by the chart.

Note: Helm chart details such as version and repo URL should be updated to the actual values of the Zeppelin chart you wish to deploy.

To execute this program, ensure you have Pulumi installed and configured with the appropriate GCP credentials. Then, run pulumi up to create these resources on your GCP project. After the Helm chart is successfully deployed and the services are running, you can connect to the IP address exported to access Zeppelin.