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Karpenter is an open-source node provisioning project built for Kubernetes. Its goal is to improve the efficiency and cost of running workloads on Kubernetes clusters. Karpenter works by:

• Watching for pods that the Kubernetes scheduler has marked as unschedulable
• Evaluating scheduling constraints (resource requests, nodeselectors, affinities, tolerations, and topology spread constraints) requested by the pods
• Provisioning nodes that meet the requirements of the pods
• Scheduling the pods to run on the new nodes
• Removing the nodes when the nodes are no longer needed

For most use cases, a cluster’s capacity can be managed by a single Karpenter Provisioner. However, you can define multiple Provisioners, enabling use cases like isolation, entitlements, and sharding. Using a combination of defaults and overrides, Karpenter determines the availability zone, instance type, capacity type, machine image, and scheduling constraints for pods it manages.

Come discuss Karpenter in the #karpenter channel in the Kubernetes slack!

Check out the Docs to learn more.

Follow the setup recommendations of your cloud provider.

• AWS

❗ Note: There may be backwards incompatible changes between versions when upgrading before v0.3.0. Karpenter follows Kubernetes versioning guidelines. Before upgrading, we recommend:

• Check the release notes
• Uninstall Karpenter
• Remove all nodes launched by karpenter
• Reinstall Karpenter

• Docs
• Concepts
• API
• Working Group
• Developer Guide
• Contributing

• 12/20/2021 How To Auto-Scale Kubernetes Clusters With Karpenter
• 11/30/2021 Karpenter vs Kubernetes Cluster Autoscaler
• 11/19/2021 Karpenter @ Container Day
• 05/14/2021 Groupless Autoscaling with Karpenter @ Kubecon
• 05/04/2021 Karpenter @ Container Day

This project is licensed under the Apache-2.0 License.