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ojfw20
AbelHu
allyford
What happened: Pods fail to start on a Windows nodepool after resource demands increase past node capacity. Pods on a Windows node also start paging to disk when the node runs out of memory.
What you expected to happen: OOMKill feature triggers scheduling of pods on a node with free memory, allowing pods to start as expected.
How to reproduce it (as minimally and precisely as possible): Overallocate a Windows node with pods, trigger pods to request more memory than the node can provide.
Anything else we need to know?: We have been informed that OOMKill is not support on Windows nodes. This seems to be a gaping hole in the feasibility of using Windows nodepools for any sort of elastic scalability. We would like to see OOMKill supported on Windows nodepools.
https://kubernetes.io/docs/setup/production-environment/windows/intro-windows-in-kubernetes/#kubelet-compatibility agrees, and states that:
The (Windows) kubelet does not take OOM eviction actions
Eviction by using --enforce-node-allocable is not implemented
Eviction by using --eviction-hard and --eviction-soft are not implemented
Environment:
kubectl version): 1.21.7