1. Using kubernetes cilium.io with externaldns.k8s.io

    TypeScript

    To create a Kubernetes cluster with cilium.io as the CNI (Container Network Interface) and externaldns.k8s.io for managing public DNS records for your services, the following Pulumi program in TypeScript will guide you through the necessary steps.

    We will use the Pulumi Kubernetes provider to apply Kubernetes manifest files (YAML) to define both Cilium and ExternalDNS components on our cluster.

    Before beginning, ensure you have the following prerequisites:

    1. Pulumi CLI installed and set up with the appropriate cloud provider (e.g., AWS, GCP, Azure).
    2. Access to a Kubernetes cluster where you have administrative permissions.
    3. kubectl command-line tool configured to communicate with your Kubernetes cluster.

    Here's how we'll proceed:

    1. Cilium Installation: Cilium will be installed as a DaemonSet to manage the network layer of our Kubernetes cluster. Cilium provides networking, security, and observability using eBPF. The necessary YAML manifest for installing Cilium can typically be obtained from the Cilium's official Get Started guide.

    2. ExternalDNS Installation: ExternalDNS will be installed to synchronize exposed Kubernetes Services and Ingresses with DNS providers. To get the necessary manifest, refer to the ExternalDNS Kubernetes tutorial.

    After obtaining the YAML files, we will use Pulumi's ConfigFile resource from the Kubernetes provider to apply these manifests onto the cluster.

    Let me show you how the Pulumi TypeScript program looks:

    import * as k8s from "@pulumi/kubernetes"; // Applying the Cilium manifest file to the cluster. const ciliumManifest = new k8s.yaml.ConfigFile("cilium", { file: "path/to/your/cilium.yaml", // Note: In a production setup, you may need to customize the manifest file to suit your specific requirements. }); // Applying the ExternalDNS manifest file to the cluster. const externalDnsManifest = new k8s.yaml.ConfigFile("externaldns", { file: "path/to/your/externaldns.yaml", // Note: You will need to modify the manifest to include your DNS provider // credentials and desired configuration as per documentation. }); // Export the kubeconfig if it's needed for further usage outside the program. export const kubeconfig = k8s.config; // The program will automatically track and export all created resources.

    In this program, we've defined two ConfigFile resources. For each ConfigFile, we specify the path to the Cilium and ExternalDNS YAML manifests. These are relatively high-level resources within Pulumi’s Kubernetes support which allow you to deploy complex applications from single or multiple files, treating files as full resources within your Pulumi program.

    This program assumes that you have the manifest files (cilium.yaml and externaldns.yaml) locally available on your filesystem, and these files are configured correctly for your environment. You should replace "path/to/your/cilium.yaml" and "path/to/your/externaldns.yaml" with the actual paths to your YAML configuration files.

    Running pulumi up with the above code will initiate the deployment of the Cilium and ExternalDNS to your Kubernetes cluster.

    Remember, this is a simplified example. Depending on your cluster setup and cloud provider, the manifest files for Cilium and ExternalDNS will need the configuration details specific to your environment, such as domain names, cloud provider API keys, and other settings.

    After applying these configurations, Cilium will manage the network policies and routing in your cluster, providing advanced features like API-aware network security, transparent load balancing, and more. ExternalDNS will update your DNS provider with the necessary records to make services accessible via widely recognized domain names.

    For further assistance or questions regarding configuring Cilium or ExternalDNS, consult the official Cilium documentation and ExternalDNS GitHub repository.


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