Software Architecture - cjus/hydra-cluster GitHub Wiki

One Pi 3 is used to host a local instance of Redis and a node webapp, called the MCP, which provides remote web-based control features. The same Pi performs compute task on its two remaining CPU cores.

Each computer is running Raspbian Jesse lite and NodeJS 6.x. The remaining 10 cores are running Hydra on each core.

The web-based MCP program allows for the display and monitoring of the cluster, it also allows for job submissions via a built in editor or file upload.

Cast of players

The Hydra Cluster consists of several software programs.

Name	Type	Purpose
Hydra	npm	Microservices library
NodeJS	platform	JavaScript execution engine and platform
Redis	server	Key-Value store and pubsub messaging
ConStats	console	Display server stats
machinfo	service	Monitors machine level status and processes jobs
MCP	web app	Master Control Program, status and job monitoring and submission
IoTNode	service	Handles job execution

All of the code, except for the code running on the Arduino micro-controller, is written in JavaScript and running under NodeJS.