hobbitgraph.cfg - Configuration of the hobbitgraph CGI
hobbitgraph.cgi(1) uses the configuration file
$BBHOME/etc/hobbitgraph.cfg to build graphs from the RRD files
collected by Xymon.
Each definition of a graph type begins with a "[SERVICE]" indicator,
this is the name passed as the "service" parameter to
hobbitgraph.cgi(1). If the service name passed to hobbitgraph.cgi is
not found, it will attempt to match the service name to a graph via the
TEST2RRD environment variable. So calling hobbitgraph.cgi with
"service=cpu" or "service=la" will end up producing the same graph.
A graph definition needs to have a TITLE and a YAXIS setting. These are
texts shown as the title of the graph, and the YAXIS heading
respectively. (The X-axis is always time-based).
If a fixed set of RRD files are used for the graph, you just write
those in the RRDtool definitions. Note that Xymon keeps all RRD files
for a host in a separate directory per host, so you need not worry
about the hostname being part of the RRD filename.
For graphs that use multiple RRD files as input, you specify a filename
pattern in the FNPATTERN statement, and optionally a pattern of files
to exclude from the graph with EXFNPATTERN (see "[tcp]" for an
example). When FNPATTERN is used, you can use "@RRDFN@" in the RRDtool
definitions to pick up each filename. "@RRDIDX@" is an index (starting
at 0) for each file in the set. "@RRDPARAM@" contains the first word
extracted from the pattern of files (see e.g. "[memory]" how this is
used). "@COLOR@" picks a new color for each graph automatically.
The remainder of the lines in each definition are passed directly to
the RRDtool rrd_graph() routine.
The following is an example of how the "la" (cpu) graph is defined.
This is a simple definition that uses a single RRD-file, la.rrd:
TITLE CPU Load
AREA:la#00CC00:CPU Load Average
GPRINT:la:LAST: %5.1lf (cur)
GPRINT:la:MAX: %5.1lf (max)
GPRINT:la:MIN: %5.1lf (min)
GPRINT:la:AVERAGE: %5.1lf (avg)
Here is an example of a graph that uses multiple RRD-files, determined
automatically at run-time via the FNPATTERN setting. Note how it uses
the @RRDIDX@ to define a unique RRD parameter per input-file, and the
@COLOR@ and @RRDPARAM@ items to pick unique colors and a matching text
for the graph legend:
TITLE Disk Utilization
YAXIS % Full
GPRINT:p@RRDIDX@:LAST: %5.1lf (cur)
GPRINT:p@RRDIDX@:MAX: %5.1lf (max)
GPRINT:p@RRDIDX@:MIN: %5.1lf (min)
GPRINT:p@RRDIDX@:AVERAGE: %5.1lf (avg)
ADVANCED GRAPH TITLES
Normally the title of a graph is a static text defined in the
hobbitgraph.cfg file. However, there may be situations where you want
to use different titles for the same type of graph, e.g. if you are
incorporating RRD files from MRTG into Xymon. In that case you can
setup the TITLE definition so that it runs a custom script to determine
the graph title. Like this:
The /usr/local/bin/graphtitle command is then called with the hostname,
the graphtype, the period string, and all of the RRD files used as
parameters. The script must generate one line of output, which is then
used as the title of the graph.
TEST2RRD Maps service names to graph definitions.
Most of the RRD graph definitions shipped with Xymon have been ported
from the definitions in the larrd-grapher.cgi CGI from LARRD 0.43c.
hobbitserver.cfg(5), rrdtool(1), rrdgraph(1)