1. Deploy the kube-dns helm chart on Google Kubernetes Engine (GKE)


    To deploy the kube-dns helm chart on Google Kubernetes Engine (GKE), you will need to follow several steps:

    1. Set up a GKE cluster if you don't have one already.
    2. Install Helm if it's not already set up in your environment.
    3. Use Helm to deploy the kube-dns chart onto your GKE cluster.

    Below is a Pulumi program written in TypeScript that carries out these steps. It assumes you have the necessary permissions and have authenticated with GCP and Pulumi CLI.

    The Pulumi program is divided into sections:

    • GKE Cluster Setup: This creates a GKE cluster using the gcp.container.Cluster resource.
    • Helm Chart Deployment: After the cluster is set up, we move on to installing the kube-dns Helm chart using the kubernetes.helm.v3.Chart resource from Pulumi's Kubernetes provider, which wraps Helm functionality.

    This program will create a GKE cluster and deploy the kube-dns Helm chart to it. Make sure you have Helm installed locally, as Pulumi will invoke the local Helm CLI to deploy the chart.

    Let's start with the code.

    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("my-gke-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" ], }, }); // Export the 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 clusterProvider = new k8s.Provider("my-gke-provider", { kubeconfig: kubeconfig, }); // Deploy kube-dns Helm chart const kubeDnsChart = new k8s.helm.v3.Chart("kube-dns", { chart: "kube-dns", // Set the name of the Helm chart you want to install // Specify the helm repository where your chart is hosted // Replace with valid repository for kube-dns if different fetchOpts:{ repo: "http://kubernetes-charts.storage.googleapis.com/", }, // Optionally, you can specify chart values values: { // example value: specify the number of replicas replicas: 2, }, }, { provider: clusterProvider }); // Export the Chart name export const chartName = kubeDnsChart.metadata.name; // When running this program, Pulumi will invoke the Helm CLI to deploy the chart, // in addition to creating and managing the GKE cluster with the specified configuration.


    GKE Cluster Setup:

    • initialNodeCount specifies the number of nodes to start within the cluster.
    • minMasterVersion and nodeVersion ensure you're using the latest versions of GKE and node for your cluster.
    • nodeConfig sets up the type of node and the OAuth scopes necessary for the GKE nodes to function correctly.

    Helm Chart Deployment:

    • A new Kubernetes provider (clusterProvider) is initialized with the kubeconfig from the created GKE cluster.
    • The kube-dns Helm chart is deployed using that provider.
    • fetchOpts.repo is set to the repository URL where the kube-dns chart can be found. Make sure to replace this with the correct repository URL if it's different.
    • values is an object that can be provided to configure the chart on deployment. I've shown an example of how to set the number of replicas.

    Finally, we export the Kubernetes cluster's kubeconfig and the Helm chart's name for easy access.

    You should replace placeholder values such as the chart repository URL with actual values that apply to your setup. Ensure your local machine has kubectl and Helm installed and configured properly to interact with your Kubernetes cluster.

    To use this program, save it as index.ts, install the necessary Pulumi packages using npm or yarn, and then run pulumi up to create the GKE cluster and deploy the kube-dns Helm chart.