Deploy the trusted-issuers-registry helm chart on Google Kubernetes Engine (GKE)

Question

Pulumi · Accepted Answer

To deploy the `trusted-issuers-registry` Helm chart on Google Kubernetes Engine (GKE), you would need to perform the following steps:

1. Create a GKE cluster where your Helm chart will be deployed.
2. Configure Pulumi to use the GKE cluster context so that it can deploy resources to that cluster.
3. Deploy the Helm chart onto the GKE cluster using Pulumi's Kubernetes provider.

For the first step, we will use the `google-native.container/v1.Cluster` resource type, which allows us to create a GKE cluster. Then, once the cluster is up and running, we will use the `kubernetes.helm.sh/v3.Release` resource, provided by Pulumi's Kubernetes provider, to deploy the Helm chart to the cluster.

Here's a Pulumi program written in TypeScript that carries out these steps:

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

// Step 1: Create a GKE cluster
const cluster = new gcp.container.Cluster("trusted-issuers-registry-cluster", {
    initialNodeCount: 2,
    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 name
export const clusterName = cluster.name;

// Step 2: Configure K8s provider to use the GKE cluster's context
const k8sProvider = new k8s.Provider("k8s-provider", {
    kubeconfig: cluster.kubeconfig.apply(JSON.stringify),
});

// Step 3: Deploy the Helm chart onto the GKE cluster
const trustedIssuersRegistryChart = new k8s.helm.v3.Chart("trusted-issuers-registry", {
    chart: "trusted-issuers-registry",
    version: "1.0.0", // Replace with the correct chart version
    // Pass necessary values to the Helm chart
    values: {
        // Add any values that your Helm chart accepts
    },
}, { provider: k8sProvider });

// Export the deployment status
export const helmDeploymentStatus = pulumi.all([trustedIssuersRegistryChart.status])
    .apply(([status]) => status);
```

Explanation:
- The `google-native.container/v1.Cluster` resource is responsible for provisioning a new GKE cluster with the specified configuration. In this example, we create a cluster with two nodes that are "preemptible", which means they may be terminated by GCP, and are typically lower cost. The `minMasterVersion: "latest"` specifies that the cluster should be created with the latest available version of Kubernetes.

- Once the cluster is created, we export its name through an output variable called `clusterName`. This could be useful if you need to reference the cluster by name outside of Pulumi.

- The `k8sProvider` object is configured with the GKE cluster context by using the output kubeconfig from the cluster creation. This tells Pulumi which cluster to use when deploying Kubernetes resources.

- The `trusted-issuers-registry` Helm chart is then deployed using Pulumi's Kubernetes provider. You have to replace `"1.0.0"` with the correct version of the Helm chart you are deploying. In the `values` object, you would typically pass configuration options that are specific to your Helm chart.

- We finally export `helmDeploymentStatus` which will provide the deployment status of the Helm chart.

Please note, the Helm chart version and the values should be adjusted based on the actual Helm chart you are deploying (`"trusted-issuers-registry"` in this example is assumed to be the chart name you provided but you need to confirm the correct name from the actual Helm chart you wish to deploy). If the Helm chart requires additional configuration (specified by `.values`), you'll need to provide the specific configuration options that the chart expects.

To use this program, you must have Pulumi installed and configured with your GCP credentials, and the appropriate Pulumi stack initialized. Remember to replace placeholder values with actual values suited to your specific scenario.