Deploy the gitlab-service helm chart on Oracle Kubernetes Engine (OKE)

Deploying GitLab on Oracle Kubernetes Engine

To deploy the GitLab service Helm chart on the Oracle Kubernetes Engine (OKE), we will follow these steps:

Setting up the OKE Cluster: You need to have an OKE cluster up and running. Oracle provides a managed Kubernetes service where you can create a cluster. You have to set up kubectl to interact with your cluster and the cluster should be properly configured with the necessary credentials in your local environment.
Adding Helm Repository: Helm charts are deployed from repositories that contain packaged charts. To deploy GitLab, you will need to add the Helm repository that contains the GitLab chart.
Deploying GitLab Service: Once the Helm repository is added, you can deploy services using Helm charts. Helm helps you manage Kubernetes applications through Helm charts that define, install, and upgrade even the most complex Kubernetes applications.

The Pulumi Program

Below is a Pulumi program in TypeScript that sets up the deployment of the GitLab service on an existing OKE cluster using a Helm chart. This program assumes that you have an existing OKE cluster and the kubeconfig file to connect to it.

First, we start by importing the required Pulumi libraries and setting up the Kubernetes provider that points to your existing OKE cluster by using the appropriate kubeconfig.

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

// Load the Kubeconfig for the Oracle Kubernetes Engine (OKE) cluster.
const kubeconfig = "your-kubeconfig-content"; // Replace this with the content of your kubeconfig file

// Create a Kubernetes provider instance that uses your OKE cluster's kubeconfig.
const provider = new kubernetes.Provider("oke-k8s", {
    kubeconfig: kubeconfig,
});

// Deploy the GitLab Helm chart on the OKE cluster.
const gitlabServiceChart = new kubernetes.helm.v3.Chart("gitlab-service", {
    chart: "gitlab",
    // Specify the GitLab Helm chart repository here.
    fetchOpts: { repo: "https://charts.gitlab.io/" },
    // Override Helm chart values here as needed, e.g., { serviceType: "LoadBalancer" }
    values: {},
}, { provider: provider });

// Export the GitLab service URL once the service is up and running.
// Depending on the service type, this could be a ClusterIP, NodePort, or LoadBalancer IP.
export const gitlabServiceUrl = gitlabServiceChart.getResourceProperty("v1/Service", "gitlab-service", "status").apply(status => status.loadBalancer.ingress[0].ip);

Explanation

kubeconfig: This is the configuration file for connecting to your Kubernetes cluster. Replace 'your-kubeconfig-content' with the actual content of your kubeconfig file. This lets Pulumi communicate with your OKE cluster.
Kubernetes Provider: This is a Pulumi component that allows you to interact with your Kubernetes cluster. It makes use of the kubeconfig content provided to manage the resources in your cluster.
Helm Chart: The kubernetes.helm.v3.Chart resource is used here to deploy the GitLab Helm chart. You would replace the placeholder in fetchOpts with the actual URL to the GitLab Helm chart repository. Optionally, you can customize the deployment by providing configurations via the values property.
gitlabServiceUrl: This export statement makes obtainable the URL of the GitLab service once it has been assigned by the Kubernetes cluster. This would typically be a LoadBalancer IP if your service is exposed to the internet.

Remember to replace the placeholders with real values that correspond to your environment and Helm chart configuration. Once this program is run with Pulumi, it will deploy the GitLab service to the specified OKE cluster. The gitlabServiceUrl will provide the endpoint to access your GitLab installation after the deployment is complete.