Karpenter Has a Free API — Automatic Kubernetes Node Scaling Without Node Groups

Karpenter is AWS's open-source Kubernetes node autoscaler that provisions just-right compute in seconds. Unlike Cluster Autoscaler, Karpenter doesn't need node groups — it directly provisions EC2 instances based on pod requirements. Free, open source, now a CNCF sandbox project. Works with any cloud (not just AWS). Why Use Karpenter? No node groups — provisions exactly the right instance type for pending pods Sub-minute scaling — 10x faster than Cluster Autoscaler Cost optimization — automatically uses Spot instances, ARM, and right-sized nodes Consolidation — removes underutilized nodes and repacks workloads Drift detection — automatically upgrades nodes when AMI changes Quick Setup 1. Install Karpenter helm repo add karpenter https://charts.karpenter.sh helm install karpenter karpenter/karpenter \ --namespace karpenter --create-namespace \ --set clusterName = my-cluster \ --set clusterEndpoint = $( aws eks describe-cluster --name my-cluster --query 'cluster.endpoint' --output text )