[EKS] [request]: enable graceful node shutdown

[yann-soubeyrand]

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Tell us about your request

EKS changelog (https://docs.aws.amazon.com/eks/latest/userguide/kubernetes-versions.html) seems to indicate tha graceful node shutdown is enabled on EKS 1.21. However, unless I’m mistaken, this is not the case. Could you consider enabling it?

Which service(s) is this request for?

EKS

Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?

Without graceful node shutdown nor aws-node-termination-handler, an EKS cluster cannot take preventive actions in response to events which lead to instance shutdown (like ASG AZ rebalance, ASG instance refresh, spot instance preemption, etc). This can lead to service disruptions. Enabling graceful node shutdown would provide an out of the box solution.

Are you currently working around this issue?

No.

Additional context

ASG AZ rebalance can happen after a scale-down made by the cluster autoscaler.

[hitsub2]

One simple question: Can we have both NTH and Node Graceful shutdown on the same EKS Cluster? My answer is yes. Because of NTH can not handle the node reboot manually by user. Am I right?

[sidewinder12s]

Graceful node shutdown is a kubelet feature, not an EKS feature. It was released in 1.21.

https://kubernetes.io/blog/2021/04/21/graceful-node-shutdown-beta/