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 Baldwin - IT Unit Australian Sports Commission www.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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