Deploying GitLab Helm Chart on GKE

Q: Deploy the gitlab-controller helm chart on Google Kubernetes Engine (GKE)

Deploy the gitlab-controller helm chart on Google Kubernetes Engine (GKE)

To deploy the gitlab-controller Helm chart on Google Kubernetes Engine (GKE), you will need to follow several steps:

Create a GKE cluster: You need a running Kubernetes cluster. With Pulumi, you can define your GKE cluster infrastructure using the gcp.container.Cluster resource.
Install the Helm chart: After the cluster is up and running, you can deploy the gitlab-controller Helm chart using the kubernetes.helm.v3.Chart resource from Pulumi's Kubernetes provider.

Here's a step-by-step Pulumi program written in TypeScript that accomplishes these tasks:

Set up Pulumi: Import necessary Pulumi and GKE packages.
Define the GKE Cluster: Define a new GKE cluster that the Helm chart will be deployed to.
Configure Helm Chart Deployment: Deploy the Helm chart to the GKE cluster.

Below is the complete TypeScript program to deploy the gitlab-controller Helm chart onto a GKE cluster:

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

// Define the GKE cluster
const cluster = new gcp.container.Cluster("gke-cluster", {
    initialNodeCount: 2,
    nodeVersion: "latest",
    minMasterVersion: "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 Cluster name
export const clusterName = cluster.name;

// Export the Kubeconfig to access the cluster
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("gke-k8s", {
    kubeconfig: kubeconfig,
});

// Deploy the gitlab-controller Helm chart
const gitlabControllerChart = new k8s.helm.v3.Chart("gitlab-controller", {
    chart: "gitlab-controller",
    version: "<chart version>", // specify the chart version
    fetchOpts:{
        repo: "https://charts.gitlab.io/", // the Helm repository URL
    },
    values: { // specify the values needed for gitlab-controller chart
        // ... fill in necessary values here
    },
}, { provider: k8sProvider }); // ensure that this Chart uses the k8s cluster

// Export the status of the Helm deployment
export const helmStatus = gitlabControllerChart.status;

Explanation

GKE Cluster: The gcp.container.Cluster resource is used to create a new GKE cluster. You can adjust the initialNodeCount, nodeVersion, and machineType according to the requirements of your gitlab-controller Helm chart.
Kubeconfig: The kubeconfig is required to interact with the cluster via kubectl and other tools. We export this for easy access to the cluster.
Kubernetes Provider: The k8s.Provider is a Pulumi wrapper around kubeconfig that translates the Pulumi deployments into Kubernetes resources.
Helm Chart: The gitlab-controller is deployed using the k8s.helm.v3.Chart resource. You need to provide the actual chart version and set the appropriate values that you wish to configure the Helm chart with.

After writing this Pulumi program, you would run pulumi up to provision the GKE cluster and deploy the Helm chart.

Deploying the Program

Ensure you have all prerequisites installed:

Pulumi CLI
Google Cloud SDK
kubectl
Helm (if needing local helm operations)

Authenticate with GCP and set your GCP project:

gcloud auth login
gcloud config set project <your-project-id>

Then, run the Pulumi program using:

pulumi up

This command initializes Pulumi, sets up the infrastructure according to the Pulumi file, and applies the Helm chart to your GKE cluster. After the deployment is completed successfully, information about the cluster and deployment status will be exported, and you can interact with your GitLab controller using kubectl.

Remember to replace <chart version> with the specific version of the gitlab-controller chart you want to deploy, and fill in the values section with the configuration specific to gitlab-controller.