NagiosGrapher: How do the links work?

[Hugo van der Kooij]

On Thu, 26 Jan 2006, Arno Lehmann wrote:

> If you posted one of the entries not working and the corresponding
> output from the check plugin someone, perhaps even I, might help you more.

I may be a bit rusty on RRDtool and regex but I miss the load issue here.

The plugin output:
	OK - load average: 2.01, 1.67, 1.55

3 gauges defined:

define ngraph{
        service_name            LOAD
        graph_log_regex         , (\d+\.\d+)($| critical| warning)
        graph_value             15min
        graph_units             load
        graph_legend            15min avg load
        rrd_plottype            AREA
        rrd_color               EACC00
        }

        graph_log_regex         , (\d+\.\d+),
        graph_value             5min
        rrd_plottype            STACK

        graph_log_regex         : (\d+\.\d+),
        graph_value             1min
        rrd_plottype            STACK

To me this should match just fine. I suspect there is nothing wrong with
that. But in the sample there is a section which has me puzzled:

define ngraph{
        service_name            LOAD
        type                    CDEF
        graph_value             cdef_load
        graph_units
        graph_legend
        graph_calc              15min,5min,+,1min,+
        rrd_plottype            LINE1
        rrd_color               000000
        hide                    no
        }

Why would one try to add these lines together anyway?

I would expect to see multiple lines in the design. These values just
don't make sense to add up. But that is for later to worry about. I can
fix the graphs when I want to later.

The log tells me:

2006-01-26 20:49:46 PIPE: aragorn       Current Load    OK - load average:
1.58, 1.59, 1.56     load1=1.580;5.000;10.000;0;
load5=1.590;4.000;6.000;0; load15=1.560;3.000;4.000;0;
2006-01-26 20:49:46 RRD: rrdtool create
/var/spool/nagios/rrd/aragorn/50651c20531d52e9c5eaa48a204e53c4.rrd --step=
RRA:AVERAGE:0.5:5: RRA:MAX:0.5:5: RRA:MIN:0.5:5: RRA:AVERAGE:0.5:30:
RRA:MAX:0.5:30: RRA:MIN:0.5:30: RRA:AVERAGE:0.5:120: RRA:MAX:0.5:120:
RRA:MIN:0.5:120: RRA:AVERAGE:0.5:1440: RRA:MAX:0.5:1440: RRA:MIN:0.5:1440:
2006-01-26 20:49:46 RRD: [aragorn][Current Load]:step size should be no
less than one second
2006-01-26 20:49:46 VALUES: [aragorn][Current Load]: 1min=1.58 5min=1.59
15min=1.56
2006-01-26 20:49:46 RRD: rrdtool update
/var/spool/nagios/rrd/aragorn/50651c20531d52e9c5eaa48a204e53c4.rrd
--template=1min:5min:15min N:1.58:1.59:1.56
2006-01-26 20:49:46 RRD: [aragorn][Current Load]:opening
'/var/spool/nagios/rrd/aragorn/50651c20531d52e9c5eaa48a204e53c4.rrd': No
such file or directory

I just don't see where the step size gets defined (besides the default
values). And digging a bit around in collect2.pl is puzling as I can't
find how $step is filled there either. But I noticed that $step is being
undefined between the actual creation of the RRD's and the log lines which
makes the logging less acurate:

                # Create the RRD
                # $step = $default_step;

                RRDs::create( $file, "--step", $step, @system );
                $step = undef;

                if($opt_verbose & $LOG_RRD_STATUS) {
                        $dummy="";
                        foreach (@system) {
                                $dummy.=$_. ' ';
                        }
                        print_log("RRD: rrdtool create $file --step=$step $dummy");
                }

                $rrd_err = RRDs::error;

collect2.pl filestamp:
# $Id: collect2.pl 885 2005-07-12 13:54:36Z gmueller $

Hugo.

-- 
	I hate duplicates. Just reply to the relevant mailinglist.
	hvdkooij at vanderkooij.org		http://hvdkooij.xs4all.nl/
		Don't meddle in the affairs of magicians,
		for they are subtle and quick to anger.


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