1

I would like to make a cluster of Raspberry Pi computers.

I find it a lot of work to individually configure the images.

Is there a way that I can have the Raspberry Pis boot from the network?

2

Yes, there is the possibility to boot the Pi over network. While older Pis are able to load the root file system over network (meaning you still need to have an SD card for each pi), the RPi 3 is able to boot without SD card over network. The image from the last links webpage offers a good overview:

enter image description here

(source: https://www.raspberrypi.org/blog/pi-3-booting-part-ii-ethernet-all-the-awesome/)

Note that I haven't used network boot so far, hence I cannot say anything about filesystem consistency when accessing the same root file system by multiple Pis in parallel, etc.

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