Flashing the Pi's - cjus/hydra-cluster GitHub Wiki
The Hydra Cluster uses three Raspberry Pi 3's, each of which is running a custom distribution of Linux called Raspbian Jesse lite.
For instructions on how to flash an SD card see SD card backup and restore.
The cluster's Raspberry Pi Zeros are running a distribution provided by the folks at ClusterHat
Each installation was modified to support both DHCP and static networking. Additionally, each Pi was equipped with NodeJS 6.5 for Arm architectures.
See these pages for more information: