Overview

Graphite consists of two major components:

1. the frontend Django webapp that runs under Apache/mod_wsgi
2. the backend carbon-cache.py daemon

Client applications connect to the running carbon-cache.py daemon on port 2003 and send it lines of text of the following format:

my.metric.name value unix_timestamp

For example:

performance.servers.www01.cpuUsage 42.5 1208815315

The metric name is like a filesystem path that uses . as a separator instead of /. The value is some scalar integer or floating point value. The unix_timestamp is unix epoch time, as an integer.

Each line like this corresponds to one data point for one metric.

Once you've got some clients sending data to carbon-cache, you can view graphs of that data in the frontend webapp.

Webapp Installation

Use the instructions in the INSTALL file.

Running carbon-cache.py

First you must tell carbon-cache what user it should run as. This must be a user with write privileges to $GRAPHITE_ROOT/storage/whisper/ Specify the user account in $GRAPHITE_ROOT/carbon/conf/carbon.conf

This user must also have write privileges to $GRAPHITE_ROOT/storage/log/carbon-cache/

Writing a client

First you obviously need to decide what data it is you want to graph with graphite. The script examples/example-client.py demonstrates a simple client that sends loadavg data for your local machine to carbon on a minutely basis.

The default storage schema stores data in one-minute intervals for 2 hours. This is probably not what you want so you should create a custom storage schema according to the docs on the graphite wiki (http://graphite.readthedocs.org/).