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kube-ipam

⚠️ Disclaimer

This project is a prototype and is intended for educational purposes only. It is not designed to be used in production environments.

Overview

kube-ipam is an IP address manager designed to allocate external IPs to Kubernetes services of type LoadBalancer.

Installation

Docker

To build the Docker image, navigate to the config directory and execute:

docker build -t kube-ipam .

Kubernetes

Apply the Kubernetes manifest from the config directory:

kubectl apply -f kubernetes_manifest.yaml

Prerequisites

  • Go (version 1.21 or higher)
  • Docker (if building a Docker image)
  • Kubernetes cluster (if deploying to Kubernetes)
  • kubectl configured to interact with your Kubernetes cluster

Usage

Command-Line Flags

  • --kubeconfig : Absolute path to the kubeconfig file. If not provided, will take config from home directory (~/.kube/config). If run in a cluster, will use service account token.
  • --cidr : CIDR block for LoadBalancer IPs allocation.

Examples

Running locally

./kube-ipam --cidr=192.168.0.0/24

Running in Kubernetes

Change the --cidr flag value in the kubernetes_manifest.yaml if necessary.

args:
  - --cidr=192.168.10.0/24

Then re-apply the manifest.

kubectl apply -f kubernetes_manifest.yaml

Project Structure

  • cmd/: Contains the main function entry for the project.
  • internal/: Houses utility functions, IPPool implementation, and Kubernetes client code.
  • config/: Contains Dockerfile and Kubernetes manifest files for deployment.

Development

To work on this project locally, follow these steps:

  1. Clone the repo:

    git clone https://github.com/blakelead/kube-ipam.git

  2. Navigate to the root directory and initialize the Go module:

    go mod init kube-ipam

  3. Download dependencies:

    go mod tidy

  4. Build the project:

    go build -o kube-ipam ./cmd

Refer to the "Installation" section for details on how to build a Docker image or deploy to a Kubernetes cluster.

License

This project is licensed under the MIT License.