simplerrd

SimpleRRD is intended to be a simple way to create pretty, usable graphs with RRDTool in Ruby. It has a simple DSL that provides a simple interface to some predefined graph styles, and also models RRDTool's command syntax with Ruby objects for those who want more control.

Synopsis:

require 'simplerrd'
include SimpleRRD

graph = FancyGraph.build do
  title   "Fancy line graph"

  width    640
  height   240
  end_at   Time.at(1252107236)
  start_at Time.at(1252107236) - (60*60*60*6)

  buffers = data('data/mem/buffers.rrd') # ds_name and cf implied
  free    = data('data/mem/free.rrd')
  cache   = data('data/mem/cache.rrd')

  plot buffers, "Used buffers" # pick color by default, set opacity to 50-80%
  plot free,    "Free space  "
  plot cache,   "Cache used  "
end

graph.generate('fancy_lines.png')

Will produce:

and

graph = FancyGraph.build do
  title   "Fancy stacked graph"

  width    640
  height   240
  end_at   Time.at(1252107236)
  start_at Time.at(1252107236) - (60*60*60*6)

  buffers = data('data/mem/buffers.rrd') # ds_name and cf implied
  free    = data('data/mem/free.rrd')
  cache   = data('data/mem/cache.rrd')

  stack_plot([buffers, "Used buffers"], 
             [free,    "Free space  "],
             [cache,   "Cache used  "])
end

graph.generate('fancy_stack.png')

A real-world example:

More information

For more examples, see the examples/ directory. The create_rrds.rb script will create the RRD data files that the examples use.

Unfortunately, beyond the examples, there's not a lot of documetation yet. The code and specs should be pretty readable, though.

Patches and such are welcome.

Copyright

Copyright (c) 2009 Sam Quigley. See LICENSE for details.