[Xymon] Problem adding GRAPHS in xymonserver.cfg (known bug?)

[David Baldwin]

SebA,
> On the latest version of Xymon trunk, I cannot get the GRAPHS= feature
> in xymonserver.cfg to work as I would hope, following the instructions
> listed here:
> http://www.xymon.com/xymon/help/howtograph.html
> If I add disk1 so it becomes:
> GRAPHS="la,disk,disk1,<... lots more ...>,xymonproxy,xymond
> the disk1 graph does not show up on the trends page.  However, I know
> the disk1 graph works, because I can view it by manipulating the URL
> generated when I click on the disk graph.  And I know the
> xymonserver.cfg file is being read OK, because if I change disk to
> disk1 in the original line, the disk graph disappears altogether. 
> What's wrong?
>
A problem I found a while ago with graphs in trends is that you need to
have directory entries of the form 'disk1.*.rrd' (wildcard matching) -
note they do not need to be the actual RRD files, since the graph
drawing uses the FNPATTERN line in the graph definition to find the
correct ones. Try doing a 'touch disk1.foo.rrd' in the rrd directory for
the host you are trying to get the disk1 graphs into the trends column for.

Below is a summary I compiled of the issues in May 2009 (apologies for
old-style pathnames).

I am building a range of graphs with devmon collecting RRD data. Some
RRD files contain multiple datasets with different units - e.g.
temperature and humidity.

I want all the graphs to appear in the trends column. Finally, after a
lot of stuffing around with different combinations, it appears that the
following conditions are required:

** RRD file name must exist starting with the graph/"service" name
* graph name must be listed in GRAPHS variable in hobbitserver.cfg
* doesn't matter if graph name is listed in TEST2RRD or not

So for the following graphs to work I created symlinks to env.*.rrd from
humidity.*.rrd - e.g.
# ls -l
total 120
-rw-rw-r--  1 hobbit hobbit 38536 May 20 15:49 env.Rack2-Front.rrd
-rw-rw-r--  1 hobbit hobbit 38536 May 20 15:49 env.Rack5(XRAID)-Rear.rrd
lrwxrwxrwx  1 root   root      19 May 20 14:29 humidity.Rack2-Front.rrd
-> env.Rack2-Front.rrd
lrwxrwxrwx  1 root   root      25 May 20 14:29
humidity.Rack5(XRAID)-Rear.rrd -> env.Rack5(XRAID)-Rear.rrd
-rw-rw-r--  1 hobbit hobbit 19552 May 20 15:48 tcp.conn.rrd

In fact, I found it was sufficient just to 'touch' the RRD filename to
create an empty file - the graph CGI script uses the correct definition
and finds the specified RRD file.

Section of hobbitgraphs.cfg
[env]
        FNPATTERN env\.(.+).rrd
        TITLE Temperature
        YAXIS Celsius
        DEF:p at RRDIDX@=@RRDFN@:temp:AVERAGE
        LINE2:p at RRDIDX@#@COLOR@:@RRDPARAM@
        GPRINT:p at RRDIDX@:LAST: \: %5.1lf (cur)
        GPRINT:p at RRDIDX@:MAX: \: %5.1lf (max)
        GPRINT:p at RRDIDX@:MIN: \: %5.1lf (min)
        GPRINT:p at RRDIDX@:AVERAGE: \: %5.1lf (avg)\n

[humidity]
        FNPATTERN env\.(.+).rrd
        TITLE Humidity
        YAXIS Percent
        DEF:p at RRDIDX@=@RRDFN@:humidity:AVERAGE
        LINE2:p at RRDIDX@#@COLOR@:@RRDPARAM@
        GPRINT:p at RRDIDX@:LAST: \: %5.1lf (cur)
        GPRINT:p at RRDIDX@:MAX: \: %5.1lf (max)
        GPRINT:p at RRDIDX@:MIN: \: %5.1lf (min)
        GPRINT:p at RRDIDX@:AVERAGE: \: %5.1lf (avg)\n

It took me a while to work out a testing harness for debugging the CGI
script, but I came up with the following shell script:

. /usr/lib/hobbit/server/etc/hobbitcgi.cfg
HOST=$1
SERVICE=trends
env REQUEST_URI=/hobbit-cgi/bb-hostsvc.sh?HOST=${HOST}\&SERVICE=$SERVICE
SCRIPT_NAME=/hobbit-cgi/bb-hostsvc.sh
QUERY_STRING=HOST=${HOST}\&SERVICE=$SERVICE REQUEST_METHOD=GET
/usr/lib/hobbit/server/bin/hobbitsvc.cgi $CGI_SVC_OPTS --debug

The debug output would show me the rrd files as they were found, and
allowed me to pin down that the graph name had to match the start of the
RRD filename.

There's probably a few bugs in all of this. It would be nice not to have
to create the RRD filenames by hand.

Thanks, David.



David.

-- 
David Baldwin - Senior Systems Administrator (Datacentres + Networks)
Information and Communication Technology Services
Australian Sports Commission          http://ausport.gov.au
Tel 02 62147830 Fax 02 62141830       PO Box 176 Belconnen ACT 2616
david.baldwin at ausport.gov.au          Leverrier Street Bruce ACT 2617


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