Pylon is a moduled collector of system metrics and all that you want to measure, using Graphite as a Backend

Because I need an easy way to add some kind of information about all my nodes, starting with the system metrics, but here is the point...you can make your beacon to add any measure that you want...check logs, inodes of the system...is up you.

And you can make the Graphite tree as you want, following an structure that you will be able to show in Graphite.

You only must to configure the file probe.ini to specify the graphite server and beacons that you will to load...and execute nexus.py

A simpleDaemon has been implemented but there are much work to do yet...

python nexus.py --start
python nexus.py --stop

The name of beacon that you will to load, must be the filename

Just type this:

pip install pyl0n

Make a .py file inside of a beacons folder and create the Class "Service" inheriting from Beacon Class:

from .beacon import Beacon

class Service(Beacon):
    graphite_namespace = "<NAME OF MEASURE>"
    expose = ["function_1_exposed", "function_2_exposed"]

    def expose_function_1_exposed(self):
        ...
        ...
        ...

    def expose_function_2_exposed(self):
        ...
        ...
        ...

You must to expose only the functions that you want to see, if you are making a new beacon function, it is not neccesary to not push to repo...just not expose it.

The functions must return a dict with 2 values, the measure name and the value (EG):

def expose_percent(self):
        return dict(
            graphite_namespace="percent",
            value=psutil.virtual_memory().percent
        )

or a list of dicts, the key of every dicts will be the 'graphite_namespace' and the value will be 'value'. This is ussefull in checks like HDD usage or something like that which involves multiple values per check. (EG):

def expose_percent_usage(self):
        data = []
        namespace = 'percent_usage'
        for part in psutil.disk_partitions():
            partitions = {}
            temp_device = self.format(part.device, namespace)
            partitions[temp_device] = psutil.disk_usage(part.mountpoint).percent
            data.append(partitions)

        return data

This data goes to graphite (multiple partitions are allowed, but not in this example):

m2m.smart.test_node.disk.disk0s2_percent_usage 80.9 1408574194
m2m.smart.test_node.disk.disk0s2_percent_usage 80.9 1408574200

Now add the name of your .py file to probe.ini in beacons field...thats it, execute nexus .py and see in graphite your data ;).

Some features that will be available in a future:

• Grouped metrics
• More beacons
• Fix tons of bugs
• ...and much more

Because of this video :P.