EKS now allows modification of cluster subnets and security groups

The recent update from Amazon Elastic Kubernetes Service (EKS) on October 24, 2023, announced a new feature that allows customers to modify the subnets and security groups associated with their existing EKS clusters. This enhancement aims to provide greater flexibility for cluster administrators to synchronize changes made to Amazon Virtual Private Cloud (VPC) resources, simplifying cluster management.

The problem that this update addresses is the challenge of adapting EKS clusters to changes in the underlying VPC resources, such as modifications or expansions in the VPC subnets. Previously, when changes were made to VPC resources, it necessitated the creation of new EKS clusters, which could be time-consuming and complex, especially for production environments.

The solution introduced by Amazon EKS is the capability for customers to update the subnets and security groups associated with their existing EKS clusters directly. This means that when changes occur in the VPC resources, such as modifications to the subnets due to VPC expansion, customers can now conveniently update their EKS clusters without the need to create new ones.

With this new functionality, cluster administrators can easily ensure that their EKS clusters remain synchronized with any changes made to the underlying VPC resources, thus streamlining the management process. This feature is immediately available for use on all existing EKS clusters across all AWS Regions where EKS is accessible. Customers interested in utilizing this feature can refer to the EKS documentation for detailed instructions on getting started.

Reference:

• https://aws.amazon.com/about-aws/whats-new/2023/10/amazon-eks-modification-cluster-subnets-security/
• https://docs.aws.amazon.com/eks/latest/userguide/network_reqs.html