I have been work­ing on a many-rasp­ber­ries clus­ter, and one of the parts I want­ed to get right is set­ting up rasp­ber­ry pi ze­ros to boot with­out any stor­age.

So, I doc­u­ment­ed it. It's all here: http­s://github.­com/ralsi­na/ze­ro-n­f­s­root