[hobbit] Larrd graphs not working

Henrik Stoerner henrik at hswn.dk
Thu Dec 29 22:30:43 CET 2005

On Thu, Dec 29, 2005 at 03:46:37PM -0500, Michael Frey wrote:
> After deleting the lines as suggested, and adding the <89>PNG, the image 
> in the viewer is still a black screen.
> If I delete the <89>PNG, the file size is zero bytes.

OK, that *is* very small.

What does the RRD files look like ? Those in the
~hobbit/data/rrd/HOSTNAME/ directory - they should be at least 
some 18-19 KB in size or larger.

If you run "rrdtool dump ~hobbit/data/rrd/HOSTNAME/tcp.conn.rrd", 
the beginning of the output should look like this:

-------- start rrdtool dump output --------
<!-- Round Robin Database Dump -->
        <version> 0003 </version>
        <step> 300 </step> <!-- Seconds -->
        <lastupdate> 1135891575 </lastupdate> <!-- 2005-12-29 22:26:15
CET -->

                <name> sec </name>
                <type> GAUGE </type>
                <minimal_heartbeat> 600 </minimal_heartbeat>
                <min> 0.0000000000e+00 </min>
                <max> NaN </max>

                <!-- PDP Status -->
                <last_ds> UNKN </last_ds>
                <value> 2.2500000000e-03 </value>
                <unknown_sec> 0 </unknown_sec>

<!-- Round Robin Archives -->
-------- end of rrdtool dump output --------

You can try generating the graph image for one of the TCP "conn" 
graphs by running

rrdtool graph x.png \
   --title "localhost TCP Connection Times Last 48 Hours" \
   -w576 -h120 -v Seconds -a PNG -s "e-48h" \
   "DEF:p0=/home/hobbit/data/rrd/localhost/tcp.conn.rrd:sec:AVERAGE" \

(replace the "/home/hobbit..." filename with the filename of your
tcp.conn.rrd file).

If you run this, what happens ? The output should be "673x199" (which is
the size of the generated PNG image), and the PNG image is in the x.png


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