Deploy the cronjob-backup-jenkins helm chart on Kubernetes

Question

Pulumi · Accepted Answer

To deploy a Helm chart on a Kubernetes cluster using Pulumi, you will need to use the @pulumi/kubernetes library. This library provides classes and functions that allow you to interact with Kubernetes resources, including Helm charts.

A Helm chart is a collection of pre-configured Kubernetes resources that can be deployed as a package. In this case, you want to deploy a Helm chart that sets up a CronJob for backing up Jenkins. Assuming that you already have a Kubernetes cluster set up and your Helm chart is available in a repository, you can use the Chart class from the Pulumi Kubernetes provider.

Here's an overview of the steps we'll follow in the code:

Import the necessary Pulumi packages.
Create a new Pulumi Kubernetes Chart resource, specifying the Helm chart details such as name, chart, and values (if required).
Export any pertinent information, such as the CronJob name or the Kubernetes namespace where it is deployed.

Below is the TypeScript code that defines the deployment of the cronjob-backup-jenkins Helm chart:

import * as k8s from '@pulumi/kubernetes';

// Step 1: Reference to the Kubernetes cluster
// Note: It is assumed that the Pulumi program is configured to connect to your Kubernetes cluster.
// Make sure your `kubeconfig` is set up correctly.

// Step 2: Deploy the `cronjob-backup-jenkins` Helm chart
const cronjobBackupChart = new k8s.helm.v3.Chart('cronjob-backup-jenkins', {
    // Replace this with the repository where your chart is located.
    // If your chart is in a public repository, specify `repo: '<repo-url>'`.
    // If your chart is local, specify `path: '<path-to-your-chart>'`.
    chart: 'cronjob-backup-jenkins',
    version: '1.0.0', // Specify the chart version if necessary
    namespace: 'jenkins', // Specify the namespace where you want to deploy
    values: {
        // Override default values from the chart here, if needed
        // Example:
        // persistence: {
        //     size: "10Gi",
        // },
    },
    fetchOpts: {
        // If the chart is in a private repository, set the access credentials here
    },
});

// Step 3: Export the namespace and release name
export const namespace = cronjobBackupChart.namespace;
export const releaseName = cronjobBackupChart.getResourceProperty('v1/Service', 'jenkins', 'metadata.name');

In this Pulumi program:

We start by importing the Pulumi Kubernetes library, which we'll use to interact with our Kubernetes cluster.
We assume that you have already configured Pulumi with access to your Kubernetes cluster. This typically involves setting up your kubeconfig file to point to your cluster.
We create a Helm chart instance using the k8s.helm.v3.Chart class, specifying the necessary details such as the chart name. In the values property of the Chart, you can provide customized configuration values that will override the chart's defaults. This could include persistent volume sizes, image versions, resource limits, and more, according to the chart's values.yaml.
We're also assuming that the chart version is 1.0.0 and that it's placed within the jenkins namespace. Please adjust according to the actual chart version and desired namespace.
If you are using a private repository for your Helm chart, provide the necessary credentials in fetchOpts. If it's a local chart or from a public repository, you can comment out or remove the fetchOpts property.
After deploying the chart, we export the namespace and release name. This information can be useful for fetching the CronJob status or other details via kubectl or the Kubernetes API.

To run this Pulumi program:

Install Pulumi and set up your Pulumi account.
Install Node.js and npm, as Pulumi uses Node.js for TypeScript execution.
Create a new directory for your Pulumi project and navigate into it.
Run pulumi new kubernetes-typescript to create a new Pulumi Kubernetes Typescript project.
Replace the contents of index.ts with the code provided above.
Adjust the chart name, version, path or repository URL, and any values you wish to override to match your chart's requirements.
Run pulumi up to preview and deploy the changes.
Check the output of pulumi up for the namespace and release name, which are exported.

Remember, Pulumi programs are real code, so you can integrate them with other software development processes, such as version control, testing, and CI/CD pipelines.