NagiosGrapher: How do the links work?

[Hugo van der Kooij]

On Fri, 27 Jan 2006, Arno Lehmann wrote:

> you're quite busy :-)

Yeah. Anything that does not work right is annoying to me. And as this was
getting real itchy I started to scratch real hard.

>
> On 1/27/2006 9:58 PM, Hugo van der Kooij wrote:
> > Did some more debugging: The section below seems to be having a bit of a
> > problem:
> >
> >             # If the RRD not exists:
> >             if ( !( -e $file ) ) {

<quote
src="http://www.cclabs.missouri.edu/things/instruction/perl/perlcourse.html">
The variable "$_" Perl presumes when needed variables are not specified.
Thus:

    <STDIN>;          assigns a record from filehandle STDIN to $_
    print;            prints the curent value of $_
    chop;             removes the last character from $_
    @things = split;  parses $_ into white-space delimited
                      words, which become successive
                      elements of list @things.
</quote>

Now we all know what children spawn from assumptions. So I think this is
one of those assumptions which do not hold true. (Perhaps it did with
another perl version.)

As perl is not quite my native language I may make my own share of
(equally wrong) assumptions. (Not to mention the pointer thing I never
quite seem to get right.)

> >                 # Adding Graph Value Key's
> >                 foreach (@blocks) {
> >                     if ( $service =~ /$_->{service_name}/ ) {

I would guess (at least I tell you ;-) that with the following block:

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
        }

$_->{service_name} would result in LOAD and would match $service if the
service send to the pipe is in fact a LOAD type of check result.

> >                         # change the default rrdtype if a different is defined
> >                         my $rrd_type = "GAUGE";
> >                         $rrd_type = $_->{rrd_type} if ( exists( $_->{rrd_type} ) );

I did not define rrd_type so the default GAUGE is just fine by me.

> >                          # setting the heartbeat#
> >                         if (!defined($heartbeat)) {
> >                                 $heartbeat = $default_heartbeat;
> >                                 $heartbeat = $_->{heartbeat} if ( exists( $_->{heartbeat} ));
> >                         }
> >
> >                         # setting the step
> >                         if (!defined($step)) {
> >                             $step = $default_step;
> >                             $step = $_->{step} if ( exists( $_->{step} ));
> >                         }

Neither of them got there explicitly so nothing exiting here.

> >                         push @system,
> >                           "DS:"
> >                           . $_->{graph_value} . ":"
> >                           . $rrd_type
> >                           . ":". $heartbeat. ":U:U";

This should result in DS:15min:GAUGE:600:U:U (600 being the default
heartbeat). But it did not.

I just got them added manually and the graphs now build fine. But it still
feel itchy about the script but I is just like that itch on your back. I
would like to scratch it but just can't reach it.

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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