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

Question

Pulumi · Accepted Answer

To deploy the opsdroid Helm chart on Google Kubernetes Engine (GKE), you'll first need to provision a GKE cluster and then use the Helm chart to deploy opsdroid onto that cluster. To achieve this with Pulumi, you'll write a program that creates a Kubernetes cluster on Google Cloud Platform (GCP) and uses the Helm package manager to deploy the opsdroid application.

Here's a breakdown of the steps we'll take in the Pulumi program:

1. We'll start by creating a GKE cluster using the `google-native.container.v1.Cluster` resource.
2. After the cluster is set up, we'll obtain the kubeconfig for connecting to the cluster with the Kubernetes provider in Pulumi.
3. Then, we'll use the Kubernetes provider to deploy the opsdroid Helm chart to the GKE cluster.

Below is the TypeScript Pulumi program to achieve the above steps:

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

// Step 1: Create a GKE cluster
const cluster = new gcp.container.Cluster("opsdroid-cluster", {
    initialNodeCount: 2,
    minMasterVersion: "latest",
    nodeVersion: "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"
        ],
    },
});

// Step 2: Obtain the kubeconfig
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
`;
    });

// Export the kubeconfig to a file
export const kubeconfigFile = new pulumi.asset.AssetArchive({
    "kubeconfig.yaml": new pulumi.asset.StringAsset(kubeconfig),
});

// Step 3: Deploy the opsdroid Helm chart using the Kubernetes provider
const opsdroidRelease = new k8s.helm.v3.Chart("opsdroid", {
    chart: "opsdroid",
    version: "x.y.z", // specify the desired chart version here
    fetchOpts: {
        repo: "https://helm.love", // assuming opsdroid chart is in this repo
    },
}, { provider: new k8s.Provider("k8s-provider", { kubeconfig }) });

// Export the cluster name and kubeconfig file
export const clusterName = cluster.name;
export const kubeconfigOutput = kubeconfig;
```

**Explanation of the Program:**

- We import the required Pulumi packages `@pulumi/pulumi` for base Pulumi functionality, `@pulumi/gcp` for Google Cloud resources, and `@pulumi/kubernetes` for interacting with Kubernetes.

- We create a GKE `Cluster` resource. The naming convention 'opsdroid-cluster' is arbitrary and you could name it anything meaningful. We start with a small cluster of 2 nodes using standard machine types and include necessary OAuth scopes that allow the cluster nodes to interact with other GCP services.

- The `kubeconfig` is generated dynamically based on the cluster details. This configuration allows your Pulumi Kubernetes provider to authenticate with your GKE cluster.

- We create a