Posted On: Jul 13, 2023

Amazon Elastic Kubernetes Service (EKS) now allows running more pods per windows node through the support for IPv4 prefix delegation mode for Windows containers. Prefix delegation mode expands the number of secondary IPv4 addresses which could be assigned to the Elastic Network Interface (ENI) by up to 16x. With this feature, customers can run up to 250 pods on a single Windows Server node, depending upon the chosen instance type.

Amazon EKS supports a single ENI per Windows Server node, and with prefix delegation, customers can now assign /28 IPv4 prefixes (or 16 IP addresses), helping them run up to 16x more Windows pods on a single EKS node. Customers can get started by updating their amazon-vpc-cni config map. To read more details about how to enable this feature, read the containers blog and the EKS best practices guide.

To learn more about running Windows containers on Amazon EKS, visit the Amazon EKS Optimized Windows AMI documentation and our product page.