Deploy Karpenter on EKS: Node Auto-Scaling Guide (2026)
Blog post from Cast AI
Karpenter is an open-source autoscaler designed for Kubernetes that efficiently provisions EC2 instances directly through the AWS API, bypassing the need for Auto Scaling Groups, and offers significantly faster node provisioning compared to the traditional Cluster Autoscaler. With Karpenter, nodes can be ready in 45–60 seconds under typical conditions, while Cluster Autoscaler takes 3–4 minutes. The current stable release, Karpenter v1.13.0, introduces a new API, replacing older components with NodePool and EC2NodeClass for improved management. The guide provides a detailed walkthrough for deploying Karpenter on EKS, highlighting prerequisites such as Kubernetes 1.25 or later, AWS CLI v2, and Helm 3. It also emphasizes the benefits of Karpenter's per-pod instance type selection from the entire EC2 catalog and its native support for AWS features like Spot instances. While Karpenter excels in speed and resource management, it relies on pod resource requests for provisioning, which can lead to overprovisioning if requests aren't optimized. To address this, Cast AI offers an additional optimization layer called KENT, which adjusts resource requests based on actual usage and provides cost visibility. The guide also advises against running Karpenter and Cluster Autoscaler simultaneously to avoid conflicts and recommends specific configurations to ensure smooth operation and cost efficiency.
No tracked trend matches for this post yet.