1. Deploy the python-fastapi-postgres helm chart on Opensshift


    To deploy the python-fastapi-postgres Helm chart on an OpenShift cluster using Pulumi, we'll proceed with the following steps:

    1. Install the Pulumi CLI and set up the OpenShift environment.
    2. Create a new Pulumi TypeScript project.
    3. Use the kubernetes.helm.v3.Chart resource to deploy the Helm chart to our OpenShift cluster.

    Detailed explanations for these steps:

    1. Pulumi CLI Installation: Before we write any Pulumi code, you need to have Pulumi CLI installed on your machine. You can download it from the Pulumi website. Once installed, you will need to log in to a Pulumi account. You can use pulumi login to log in to the Pulumi Service or a self-hosted Pulumi backend.

    2. OpenShift Environment: Ensure that you have access to your OpenShift cluster and that the oc CLI tool is configured to communicate with your cluster. You'll also need to have kubectl configured as Pulumi relies on it to interact with Kubernetes resources.

    3. Pulumi Project Setup: Initialize a new Pulumi project with the TypeScript template. You can do this by running pulumi new typescript in your terminal, and following the prompts to set up your project.

    4. Helm Chart Deployment: We'll use Pulumi's Kubernetes provider to deploy resources to OpenShift. Specifically, we'll deploy the python-fastapi-postgres Helm chart using Pulumi's Kubernetes Helm library. Helm allows us to define, install, and upgrade complex Kubernetes applications. The python-fastapi-postgres Helm chart would be a pre-packaged version of an application and its dependencies, configured for deployment on Kubernetes. You'll need to know the repository where this Helm chart is located or have a local copy of it.

    Now, let's write the Pulumi program:

    import * as k8s from "@pulumi/kubernetes"; // Replace these variables with the actual values for your Helm chart. const helmRepoUrl = "https://charts.example.com/"; // The URL of the Helm repo where python-fastapi-postgres is hosted. const chartVersion = "1.0.0"; // The version of the Helm chart that you want to deploy. // Create the Helm Chart resource using Pulumi. const fastapiApp = new k8s.helm.v3.Chart("python-fastapi-postgres-helm-chart", { chart: "python-fastapi-postgres", version: chartVersion, // Uncomment the following line if your Helm chart is in a custom repository. // fetchOpts: { repo: helmRepoUrl }, // Specify any custom values here. values: { // Provide specific configuration options here. }, // Specify the namespace if you're deploying to a specific OpenShift project. // namespace: "my-openshift-namespace", }, { provider: k8sProvider }); // Export the base URL for the FastAPI application. // This assumes your Helm chart exposes a service that can be used to access the FastAPI server. export const fastapiUrl = fastapiApp.getResourceProperty("v1/Service", "python-fastapi-postgres", "status") .apply(status => status.loadBalancer.ingress[0].hostname);


    • We begin by importing the @pulumi/kubernetes package that allows us to interact with Kubernetes resources, including those on an OpenShift cluster.

    • We define variables for the Helm repository URL and the version of the python-fastapi-postgres Helm chart. You must replace these placeholders with the actual values relevant to your Helm chart.

    • We instantiate a new Helm Chart resource with new k8s.helm.v3.Chart(). This tells Pulumi to deploy the specified Helm chart to the connected OpenShift cluster.

      • chart: This is the name of the Helm chart we want to deploy.
      • version: We specify the version of the Helm chart to ensure we deploy the correct one.
      • fetchOpts: If the Helm chart is in a custom repository, we need to specify the URL where it can be found. We've commented out this property for simplicity, but you'll need to uncomment and adjust it if your chart isn't in the standard Helm repositories.
      • values: Helm charts allow you to provide custom values to override default settings in the values.yaml file of the chart. Here, you can customize the configuration specific to your application needs. This is not used in this example but should be filled out according to your chart's required customizations.
      • namespace: This specifies the OpenShift project where you want to deploy the Helm chart. Commented out by default; if needed, uncomment and provide your target namespace.
    • Lastly, we export the fastapiUrl, which provides the base URL for the deployed FastAPI application. This would typically be the URL you can use to access your FastAPI application over the Internet. The specific code to export the URL may change depending on how your Helm chart exposes the FastAPI service. Here, we're making an assumption on a common service deployment. You will need to tailor this to match the specifics of your setup.

    After writing and saving this Pulumi code, you can deploy it by running pulumi up in the directory where your Pulumi project is located. Pulumi will show you a preview of the changes and prompt for confirmation before applying the changes to the OpenShift cluster.

    Remember, the actual values and configurations you pass to the Helm chart must align with what python-fastapi-postgres requires, which would be detailed in the chart's documentation or values.yaml file.