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A skeptic's first contact with Kubernetes

A journey into Kubernetes: key concepts from a systems engineer's perspective, with a detour to yaml-template-hell.

If you want to haver per-instance persistent storage, you can use a StatefulSet which defines in a single resource: a workload (Pod), replica count, mount configuration and volume claim template. This seemed weird, and the explanations that I found online say that apparently lower numbered instances are "core" or "more stable" – I don't get it, as a crashy Pod will not get renumbered. Overall, I think the concepts make a lot of sense, specifically I think Services (including the networking model, and kube-proxy) are fantastic, and that keeping the Controller pattern as an engine for resource management is the right way to operate.

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