Deploy the openshift-jenkins helm chart on Kubernetes

Question

Pulumi · Accepted Answer

To deploy the openshift-jenkins Helm chart on a Kubernetes cluster using Pulumi, you'll first need to ensure you have a Kubernetes cluster up and running. Pulumi will communicate with this cluster using the current context in your local `.kubeconfig` file or using cluster configuration passed programmatically.

Below is the Pulumi program written in TypeScript to deploy the openshift-jenkins Helm chart onto an existing Kubernetes cluster. The program uses the `kubernetes.helm.v3.Chart` resource from Pulumi's Kubernetes provider which represents a Helm chart in a Pulumi program.

The Helm chart resource accepts various configuration parameters such as the chart name, values to customize the deployment, the namespace to deploy into, and other chart-specific options.

Here's the detailed Pulumi program:

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

// Name of the Helm chart to be deployed.
const chartName = "openshift-jenkins";

// The repository where the Helm chart is located.
// Make sure to use the correct repository that contains the openshift-jenkins chart.
const chartRepo = "https://example.com/helm-charts"; // Replace with actual Helm repo URL

// The version of the Openshift-Jenkins Helm chart you wish to deploy.
const chartVersion = "X.Y.Z"; // Replace with a specific chart version

// Initialization of the Helm chart.
const openshiftJenkinsChart = new k8s.helm.v3.Chart(chartName, {
    repo: chartRepo,
    chart: chartName,
    version: chartVersion,
    // Values for the chart can be provided in the 'values' parameter. 
    // These will override the default values in the chart's `values.yaml`.
    // For example, you could provide the admin password, persistence options, or any other custom configuration.
    values: {
        // Add any values here to customize your Openshift Jenkins deployment.
        // Example:
        // AdminPassword: "yourStrongPassword"
    },
    // The namespace to deploy the chart into. If not specified, it will be installed in the default namespace.
    // Make sure to create the namespace if it does not exist or if you're not using the default.
    namespace: "jenkins-namespace", // Replace with the namespace where you want to deploy the chart.
});

// Exports to access the deployed helm chart easily outside of Pulumi.
// For examples: exporting the URL to access the Jenkins instance if it's exposed.
export const jenkinsUrl = openshiftJenkinsChart.getResourceProperty(
    "v1/Service", `${chartName}-openshift-jenkins`, "status").apply(status => status.loadBalancer.ingress[0].ip || status.loadBalancer.ingress[0].hostname);
```

Before deployment, you should have the following prerequisites:
- A Kubernetes cluster where you can deploy the chart.
- Pulumi CLI installed and configured to connect to your Kubernetes cluster.
- Access to the Helm chart repository containing the openshift-jenkins Helm chart.
- Decide if custom values should override the defaults in `values.yaml` for the Helm chart, and if so, update the `values` object in the code accordingly.
- Replace `chartRepo` and `chartVersion` with actual values specific to the openshift-jenkins Helm chart you want to deploy.

By running this Pulumi program, you will deploy the openshift-jenkins Helm chart to your Kubernetes cluster. Note that you will need network access to the specified `chartRepo` from wherever you're running Pulumi, which could be your local machine or a CI/CD pipeline.

Please double-check the configuration, especially the chart version and repository URL, before running the program. If the openshift-jenkins Helm chart exposes any services, e.g., a web UI, the `jenkinsUrl` export will provide you with the address to access the service once it's available. If the service requires internal cluster access instead of being available publicly, you will need a different method to access the service, such as using port-forwarding or a VPN to the Kubernetes cluster network.