[Xymon] Collect RRD data just for specific host/test combinations?

[Henrik Størner]

On 08-05-2012 17:03, SebA wrote:
> Hi list. Is there a way of just telling Xymon to collect RRD data just
> for specific host/test combinations? (Rather than all hosts for a given
> test, which is how the http://www.xymon.com/xymon/help/howtograph.html
> page says is the way to do it.)

Not out of the box.

Wouldn't be terribly difficult, though. The xymond_rrd module is fed 
with data by xymond_channel via it's standard input filestream. So you 
could whip up a simple script that you stuck in between xymond_channel 
and xymond_rrd - it would just look at the "@@status..." line which 
indicates the beginning of a new message, and if it matches the 
host+test spec then copy the data to standard output; if it doesn't 
match, just throw it away.

In pseudo code:

    while (true)
      grab_next_message();
      if (header_matches(firstLineOfMessage))
          print(message);

You can look at the "rootlogin.pl" script to see how you can grab a 
message from xymond_channel.

Then write a two-line script "rrdfilter.sh"

    #!/bin/sh
    myfilter | xymond_rrd $*
so you filter input through your filter program, and change tasks.cfg from
     CMD xymond_channel --channel=status xymond_rrd ...
to
     CMD xymond_channel --channel=status rrdfilter.sh ...


Regards,
Henrik