AWS recently has started charging for all the IPv4 addresses associated with your EC2 instances, NAT gateways or public-facing interfaces. If we sum up, it will be a significant cost increase if you havenot thought about disabling auto assigning of IP address running in public subnets.

We run AWS EKS cluster with eks managed node groups created using terraform-aws-eks module. Also, we use eks-managed-node-group sub module to create multiple node groups that are spread across public and private subnets.

By default, the instances created in public instances are assigned an IPv4 public IP. Our K8S services are already behind Load balancers or ingress controllers, so there is no need to have the public IPs assigned to the worker nodes. Currently, the terraform module does not have any flag to specify disabling the auto assign of IP.

Is there a way we can achieve this flag to disable auto assign or any approach that has been developed to avoid unnecessary costs with IP addresses?