This made me remember Fleet[0], which I used in the past on CoreOS. It was a very good abstraction for my simple cluster. It felt as robust as a managed cloud service. It's a shame it didn't catch on (and also what happened to CoreOS).
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Arguably worse, IMHO, is that the name lives on but does something wholly different, polluting search results
Anyway, I wanted to plug Flatcar which forked CoreOS back when the nonsense started and have been pretty pleasant to work with. They are still misguided about user-data management, and have since been acquired by Microsoft(!), but the code lives on https://github.com/flatcar/Flatcar#readme and https://www.flatcar.org/docs/latest#upgrading-from-coreos-co...
> Flatcar project repository for issue tracking, project documentation, etc.
Per the building page https://www.flatcar.org/docs/latest/reference/developer-guid...
the actual code seems to be at https://github.com/flatcar/scripts.git