k8s-node-drainer

README

k8s-node-drainer

k8s-node-drainer is a tool designed to drain Kubernetes high CPU utilized nodes in a safe and automated way. It ensures that your nodes are drained properly, taking care of evicting all running pods, respecting Pod Disruption Budgets (PDBs), and handling long-running processes efficiently.

Features

• Automatically drains Kubernetes nodes.
• Respects Pod Disruption Budgets (PDBs).
• Graceful handling of long-running processes.
• Configurable via Helm charts for easy deployment.

Prerequisites

• Kubernetes cluster
• kubectl access to the cluster
• Go (for local development)
• Docker (for containerization)
• Helm (for Kubernetes deployment)

Installation

Using Helm

To deploy the k8s-node-drainer using Helm, follow these steps:

1. Install the Helm chart:

   helm install oci://ghcr.io/matanbaruch/charts/node-drainer --generate-name
   

2. Verify the deployment:

   kubectl get pods
   

Configuration

The Helm chart is highly configurable via the values.yaml file. Some key configuration options include:

• replicaCount: Number of replicas of the node drainer.
• image.repository: The Docker image to use for the node drainer.
• resources: Resource requests and limits for the node drainer pod.
• tolerations: Define tolerations if your nodes have taints.

Usage

To drain a node manually, use the following command:

kubectl drain <node-name> --ignore-daemonsets --delete-emptydir-data

This tool automates the above process, ensuring safe and controlled node draining.

Development

Prerequisites

• Go 1.22+
• Docker
• Kubernetes (for testing)

Steps

1. Clone the repository:

   git clone https://github.com/<your-username>/k8s-node-drainer.git
   cd k8s-node-drainer
   

2. Install dependencies:

   go mod download
   

3. Build the binary:

   go build -o k8s-node-drainer main.go
   

4. Run the tool locally:

   ./k8s-node-drainer
   

License

This project is licensed under the MIT License. See the LICENSE file for more details.

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