1. Deploy the application helm chart on Kubernetes


    Deploying a Helm chart on Kubernetes using Pulumi involves several core concepts:

    1. Kubernetes Cluster: To deploy a Helm chart, you'll need a Kubernetes cluster. In this example, I will assume that you have a cluster up and running and that you have configured your kubeconfig file correctly to interact with it.

    2. Helm Chart: Helm charts are packages for Kubernetes resources. A chart is a collection of files that describe a related set of Kubernetes resources. You must have a Helm chart either from a repository or your local files.

    3. Pulumi Kubernetes Provider: Pulumi needs to interact with Kubernetes, and you can achieve this using the Kubernetes provider which enables Pulumi to deploy resources to a Kubernetes cluster.

    4. Pulumi Helm Package: Pulumi has a Helm package that allows you to leverage Helm charts within Pulumi programs.

    Let's create a Pulumi program that deploys a Helm chart to a Kubernetes cluster using TypeScript. You'll need the @pulumi/kubernetes package, which includes classes and methods to interact with Kubernetes resources, including Helm charts.

    Below is the detailed Pulumi program that can be used to deploy a Helm chart on your Kubernetes cluster:

    import * as k8s from "@pulumi/kubernetes"; // The version should be the semantic version of the chart we want to deploy, // for example, '1.2.3'. const chartVersion = "x.y.z"; // The chart name should be the name of the chart we want to deploy. // It should exist in the repository we're using. const chartName = "<CHART_NAME>"; // The repository URL where the chart can be found. For example, // 'https://charts.bitnami.com/bitnami'. const repoUrl = "<HELM_CHART_REPOSITORY_URL>"; // The namespace in which to deploy the Helm chart. // Make sure this namespace exists in your Kubernetes cluster. const namespace = "<KUBERNETES_NAMESPACE>"; // Any additional values you want to pass to the Helm chart. const values = { key: "value", // Replace with actual key-values required by the chart. }; // This is the main function where we create an instance of a Helm chart, // which Pulumi will deploy to our Kubernetes cluster. const helmChart = new k8s.helm.v3.Chart(chartName, { chart: chartName, version: chartVersion, namespace: namespace, fetchOpts: { repo: repoUrl }, values: values, }); // Export the name(URL) of the deployed service, for example, if your chart exposes a service. export const serviceUrl = helmChart.getResourceProperty("v1/Service", "my-service", "status").apply(status => status.loadBalancer.ingress[0].hostname || status.loadBalancer.ingress[0].ip);

    Here's what this program does:

    • It imports the @pulumi/kubernetes package for communicating with a Kubernetes cluster.
    • It then defines variables to specify:
      • The version of the helm chart.
      • The helm chart name you want to deploy.
      • The helm chart repository URL.
      • The namespace where the Helm chart should be deployed.
      • Any additional values for customizing the Helm chart's default values.
    • It creates an instance of the Chart class from the @pulumi/kubernetes package, which represents a Helm chart in Pulumi, and sets the required properties: chart, version, namespace, fetchOpts, and values.
    • Finally, it exports the service URL, which would be the entry point to access the deployed application if the Helm chart exposes a service. This uses the getResourceProperty function to fetch details of a resource managed by the Helm chart.

    Remember, to run this Pulumi program, you must have Pulumi installed, an active Kubernetes cluster, and kubectl configured to connect to your cluster. You will place the TypeScript code in a index.ts file within your Pulumi project directory and then execute it using the pulumi up command from the CLI.