Posted On: Oct 24, 2023

Starting today, customers can update the subnets and security groups associated with their existing Amazon Elastic Kubernetes Service (EKS) clusters. This additional cluster management flexibility makes it simpler for cluster administrators to stay in sync with changes made to Amazon Virtual Private Cloud (VPC) resources. 

EKS clusters run on Amazon VPC networks, providing a performant and secure environment for running Kubernetes applications. As part of this model, cluster administrators must specify VPC subnets and security groups during cluster creation, which are used to enable secure communication between the EKS managed Kubernetes control plane and customer applications. When changes are made to underlying VPC resources, such as new subnets associated with VPC expansion, existing EKS clusters can now be updated to stay in sync without the need to create new clusters. 

This functionality can be used today on all existing EKS clusters in all AWS Regions where EKS is available. To get started visit the EKS documentation