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

Question

Pulumi · Accepted Answer

To deploy the `podsecuritypolicy` Helm chart on Google Kubernetes Engine (GKE), you will first need to set up a GKE cluster, then use Pulumi's `Helm` resource to deploy the chart to that cluster. Below is a step-by-step guide to achieve this using Pulumi with TypeScript.

### Step 1: Set Up GKE Cluster
First, you create a GKE cluster that the Helm chart will be deployed to. For this, you'll use the `google-native.container.v1.Cluster` resource.

### Step 2: Deploy the Helm Chart
After the cluster is ready, you deploy the `podsecuritypolicy` Helm chart to your GKE cluster using the `@pulumi/kubernetes` library, which provides a `helm.v3.Chart` resource for this purpose.

Here is a TypeScript program that does these things:

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

// Step 1: Create the GKE cluster
const cluster = new gcp.container.Cluster("gke-cluster", {
    initialNodeCount: 1,
    nodeVersion: "latest",
    minMasterVersion: "latest",
});

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

// Configure K8s provider to use the GKE cluster credentials
const k8sProvider = new k8s.Provider("gke-k8s", {
    kubeconfig: cluster.endpoint.apply(endpoint => {
        // Use the cluster name and location to get the Kubeconfig for the GKE cluster
        return gcp.container.getCluster({
            name: cluster.name,
            location: cluster.location,
        }).then(clusterInfo => {
            const context = `${gcp.config.project}_${gcp.config.zone}_${cluster.name}`;
            return `apiVersion: v1
clusters:
- cluster:
    certificate-authority-data: ${clusterInfo.masterAuth[0].clusterCaCertificate}
    server: https://${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 podsecuritypolicy Helm chart
const podSecurityPolicyChart = new k8s.helm.v3.Chart("podsecuritypolicy-chart", {
    chart: "podsecuritypolicy",
    version: "1.0.0", // specify the exact chart version you want to deploy
    fetchOpts: {
        repo: "https://charts.your-repo.com", // replace with the URL of your chart repository
    },
}, { provider: k8sProvider });

// Export the status of the deployed Helm chart
export const helmChartStatus = podSecurityPolicyChart.status;
```

**Explanation:**
- We import the required Pulumi packages for GCP and Kubernetes.
- We declare a GKE cluster with `gcp.container.Cluster` and specify some mandatory options such as the initial node count and versioning details.
- We create a `kubeconfig` that enables the Pulumi Kubernetes provider to communicate with your GKE cluster.
- Using the Kubernetes provider, we deploy a Helm chart named `podsecuritypolicy`. We specify the chart's name and version, you will need to specify the chart repository where `podsecuritypolicy` is hosted (the `repo` option).
- We export the name and status of the cluster as well as the status of the deployed Helm chart. These will be printed to the console when you run `pulumi up`.

Before running this code with Pulumi, ensure that you have access to the GKE and the Helm chart you wish to deploy is accessible in the specified Helm repository.

Replace `"https://charts.your-repo.com"` with the actual URL where your chosen Helm chart is hosted.

Also, it's worth noting that at the time of writing this, Google has deprecated PodSecurityPolicies as of version 1.21 and is removing it in version 1.25. It is encouraged to use other security mechanisms provided by Kubernetes such as OPA Gatekeeper or Kyverno. Make sure to adjust your security policies based on the best practices and current tools recommended by the Kubernetes community.

To run this Pulumi program, you would execute `pulumi up` within the directory where this code resides, and Pulumi will handle the provisioning and updating of the resources.