DNS problem on AWS EKS when running in private subnets

Question

I have an EKS cluster setup in a VPC. The worker nodes are launched in private subnets. I can successfully deploy pods and services.

However, I\'m not able to perform DN

Answer 1

We had run into a similar issue where DNS resolution times out on some of the pods, but re-creating the pod couple of times resolves the problem. Also its not every pod on a given node showing issues, only some pods.

It turned out to be due to a bug in version 1.5.4 of Amazon VPC CNI, more details here -- https://github.com/aws/amazon-vpc-cni-k8s/issues/641.

Quick solution is to revert to the recommended version 1.5.3 - https://docs.aws.amazon.com/eks/latest/userguide/update-cluster.html