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Wonder if some old netbooks could be used for this purpose. Doubt I am the only one with a small pile of them laying around.

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From experience, anything with 2GB or more RAM can be a master node. Workers can even have 1GB and work just fine.

Be warned, though, in my experience etcd requires a somewhat decent read/write latency, or else it's going to fail, and when etcd fails everything fails. Your changes don't apply, etc.

_Technically_ 1GB is the limit, but yeah, at 1GB I was hitting OOM errors every day or so (this was on the Pi 3 B+). I was very happy when I found out the Pi 4 had 2 or 4GB models! No matter what, you should also make sure to not schedule Pods on the master node(s) when you have limited memory (or in most cases, really...).

Or set tight resource limits.

Setting resource requests also enables the use of HorizontalPodAutoscalers.

Very true. The Pi Dramble's web pods are set to scale using the HPA.

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