cheesewhiz's Introduction

Cheese Whiz Design

###Terms:

Cheese Whiz - Working name for the "runner" program that makes sure the processes that should be running are running.

Whizzifest - The manifest which contains the names and locations (formatted as processName|destination) of the processes that should be active in the current version.

###Requirements:

Cheese Whiz should be able to periodically check what processes are running, and which are not running, in relation to what should be running.
The list of programs that should be running will be created and maintained manually
It should be able to start the programs that should be running and are not, and terminate the programs that are running and should not be.
It should do all of this automatically and periodically.

###Components:

Cron Job - allows for automacy and periodicity

the cron job activates the process that reads whizzifest
Read whizzifest - reads and sends the manifest of programs that should be running

read whizzifest is activated by the cron job and passes a list of names and destinations to the process that checks running processes
Check running processes - checks which processes are running, returns what is not running that should be

check running processes receives a list of names and destinations from the read whizzifest process and passes a string of processes that are not running but should be to the run inactive process
Run inactive - runs inactive processes that should be active and terminates active processes that should be inactive

the run inactive process gets a string of processes that need to be executed and executes them.

###Additional Notes:

The completed program source should live in the master server and get pulled to each of the RPIs by quesofiesta
The third step (the process that checks for running processes) should recursively call itself until there are no remaining inactive processes that should be active

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cheesewhiz's Issues

Hitman and readwhizzifest both read from ps.txt

Update cheesewhizz so that it can run differently on separate machines.

The master and the chunkservers both need to be monitored by the runner on different machines, and the pi's need to not run the master and backus probably shouldn't be running a chunkserver.

Add restart function

Weedfox, I know you can do this. Your mission, which you have no choice but to accept, is to add a thing that will restart a given process on command.