[Xymon] rrddefinitons.cfg - how to modify the default step in RRA

8 Feb 2013 · *LINE="data $MACHINE.trends*


      From the rrddef.cfg comments:
Each section key is the column- or data-name reported from your
client test. Typically this is "cpu", "memory", "tcp", or some
custom test you have created.
In your original script:
[ buda ext]# cat httpd_threads.sh
#!/bin/bash
THREADS_HTTP=ps -ef | grep -c [h]ttpd
*LINE="data $MACHINE.trends*
[httpd_threads.rrd]
DS:threads:GAUGE:5:U:U $THREADS_HTTP"
$BB $BBDISP "$LINE"
it appears that your  data name is "trends".  This is what xymon is
trying to match in rrddef.cvf.  The key you should be using in rrddef.cfg.
[trends]
-s 5
RRA:AVERAGE:0.5:60:576
RRA:AVERAGE:0.5:360:576
RRA:AVERAGE:0.5:1440:576
RRA:AVERAGE:0.5:17280:576
With that said, "trends" is already a column heading... I'm not sure
that using it for your rrd key won't cause other problems in xymon.

Maybe change it to "httpd_threads"?
If that doesn't work, try putting the -s in the default section "[]",
and see if that works.  You shouldn't leave it there as it will set all
future graphs to a 5 second step, but it works there, then you know your
problem is with your data name and key.
Michael Beatty
Sherwin-Williams
IT Analyst/Developer
michael.beatty at sherwin.com
216-515-7374
On 02/08/2013 09:47 AM, Nico wrote:
...
Hi
i modified also the name but no change.
[httpd_threads]
-s 5
RRA:AVERAGE:0.5:60:576
RRA:AVERAGE:0.5:360:576
RRA:AVERAGE:0.5:1440:576
RRA:AVERAGE:0.5:17280:576
There is no column, the script is only posting RRD data.
...
...
...
...
...
[ buda ext]# cat httpd_threads.sh
#!/bin/bash
THREADS_HTTP=ps -ef | grep -c [h]ttpd
LINE="data $MACHINE.trends
[httpd_threads.rrd]
DS:threads:GAUGE:5:U:U $THREADS_HTTP"
$BB $BBDISP "$LINE"
Is it the issue ?
Cheers
NIco
Le 8 févr. 2013 à 15:22, Michael Beatty <Michael.Beatty at sherwin.com
<mailto:Michael.Beatty at sherwin.com>> a écrit :
...
in your rrdef.cfg file, Is your key correct?  Is the column you are
reporting really [httpd_threads/15]?  This key is what it matches
against your column.  If your key is [httpd_threads/15] but the
column is "httpd_threads" (without the "/15"), then the rrd will be
created with the default "[]" definition.
Michael Beatty
Sherwin-Williams
IT Analyst/Developer
michael.beatty at sherwin.com
216-515-7374
On 02/08/2013 09:06 AM, Nico wrote:
...
Hi,
i tried "-s" trick and i also checked the man of rrdcreation which
made a reference of your suggestion:
--step|-s step (default: 300 seconds)
Specifies the base interval in seconds with which data will
be fed into the RRD.
i tried to add both in rrddefinitions.cfg :
[httpd_threads/15]
--step 5
RRA:AVERAGE:0.5:60:576
RRA:AVERAGE:0.5:360:576
RRA:AVERAGE:0.5:1440:576
RRA:AVERAGE:0.5:17280:576
or
[httpd_threads/15]

s 5
RRA:AVERAGE:0.5:60:576
RRA:AVERAGE:0.5:360:576
RRA:AVERAGE:0.5:1440:576
RRA:AVERAGE:0.5:17280:576

But it doesn't change anything, the RRD file is still created with 300.
What s wrong ?
Cheers
Nico
Le 8 févr. 2013 à 14:57, Nico <nicolas at lienard.name
<mailto:nicolas at lienard.name>> a écrit :
...
Hi
Thanks for answer.
I updated the rrddefinitons.cfg with your recommandations :
[httpd_threads/15]
-s 5
RRA:AVERAGE:0.5:60:576
RRA:AVERAGE:0.5:360:576
RRA:AVERAGE:0.5:1440:576
RRA:AVERAGE:0.5:17280:576
Then i restarted xymon server (it is needed ? in doubt i did it).
I also deleted the previous RRD file to see how is created a fresh
one after the modification:
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE rrd SYSTEM "http://oss.oetiker.ch/rrdtool/rrdtool.dtd">
<!-- Round Robin Database Dump -->
<rrd>
<version>0003</version>
<step>*300*</step> <!-- Seconds -->
<lastupdate>1360331300</lastupdate> <!-- 2013-02-08 14:48:20 CET -->
    &lt;ds>
            &lt;name> threads &lt;/name>
            &lt;type> GAUGE &lt;/type>
<minimal_heartbeat>*5*</minimal_heartbeat>
<min>NaN</min>
<max>NaN</max>
            &lt;!-- PDP Status -->
<last_ds>32</last_ds>
<value>3.1000000000e+03</value>
<unknown_sec> 105 </unknown_sec>
</ds>
Unfortunately, it is still a step of 300.
What did i miss ?
Thanks again.
Cheers
Nico
Le 8 févr. 2013 à 14:19, Michael Beatty <Michael.Beatty at sherwin.com
<mailto:Michael.Beatty at sherwin.com>> a écrit :
...
The 5 in your DS is your heartbeat, not step.
Put a -s parameter in rrddefinitions.cfg  ie:
[httpd_treads/5]
-s 5
RRA:AVERAGE:0.5:60:576
RRA:AVERAGE:0.5:360:576
RRA:AVERAGE:0.5:1440:576
RRA:AVERAGE:0.5:17280:576
This will change your step to 5 seconds.  Note, that you will
probably want to change your heartbeat to a value greater than
your step.  By setting your heartbeat = step, you are running a
probable scenario of missing data. Your heartbeat should be
greater than your step, I'd recommend double, if not triple.
Both step and heartbeat are set when the rrd file is created, you
cannot change them on the fly.  If you do not wish to lose
existing data, you will need to run "rrdtool tune -h threads:10"
to change your heartbeat.   Then, you will need to dump your rrd
to a file, edit the xml step with a text editor, then restore your
rrd from the edited xml,
rrdtool dump httpd_threads.rrd > threads.xml
edit the threads.xml setting step to 5
rrdtool restore threads.xml httpd_threads.rrd
If you plan on doing this on several hosts, or plan on doing it
frequently, I suggest you write a script and utilize the xymon
grep utility.... it will make your life considerably easier.
Michael Beatty
Sherwin-Williams
IT Analyst/Developer
michael.beatty at sherwin.com
216-515-7374
On 02/07/2013 02:59 PM, Nico wrote:
...
Hi
I need to do a temporarily graph with a very low frequency : 5
seconds instead of the regular 300 seconds.
1/ On client side, the external script is simple:
[ buda ext]# cat httpd_threads.sh
#!/bin/bash
THREADS_HTTP=ps -ef | grep -c [h]ttpd
LINE="data $MACHINE.trends
[httpd_threads.rrd]
DS:threads:GAUGE:5:U:U $THREADS_HTTP"
$BB $BBDISP "$LINE"
So, as you can see, the step is 5 in the DS.
clientlaunch.cfg has "INTERVAL 5s".
2/ On Xymon server side :
rrddefinitions.cfg  :
step = 5 seconds
[httpd_threads/5]
# 576 * 60 * 5 sec = 48 h soit 2 jours sans perte
RRA:AVERAGE:0.5:60:576
RRA:AVERAGE:0.5:360:576
RRA:AVERAGE:0.5:1440:576
RRA:AVERAGE:0.5:17280:576
This one is the default setup. You can change it, if you like.
[]
# 576 datapoints w/ 5 minute interval = 48 hours @ 5 min avg.
RRA:AVERAGE:0.5:1:576
# 576 datapoints w/ 6*5 minute averaged = 12 days @ 30
min avg.
RRA:AVERAGE:0.5:6:576
# 576 datapoints w/ 24*5 minute averaged = 48 days @ 2
hour avg.
RRA:AVERAGE:0.5:24:576
# 576 datapoints w/ 288*5 minute averaged = 576 days @ 1
day avg.
RRA:AVERAGE:0.5:288:576
3/ RRD created:
here the issue, the step is still 300. The minimal_heartbeat is 5.
rrdtool dump httpd_threads.rrd
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE rrd SYSTEM "http://oss.oetiker.ch/rrdtool/rrdtool.dtd">
<!-- Round Robin Database Dump -->
<rrd>
<version>0003</version>
<step>*300*</step> <!-- Seconds -->
<lastupdate>1360264485</lastupdate> <!-- 2013-02-07 20:14:45 CET -->
    &lt;ds>
            &lt;name> threads &lt;/name>
            &lt;type> GAUGE &lt;/type>
<minimal_heartbeat>5</minimal_heartbeat
--- snip ---
How can i change the step to 5 instead of 300 ?
Thanks for your help.
Cheers
Nico

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[Xymon] rrddefinitons.cfg - how to modify the default step in RRA

Michael.Beatty＠sherwin.com

Each section key is the column- or data-name reported from your

client test. Typically this is "cpu", "memory", "tcp", or some

custom test you have created.

step = 5 seconds

This one is the default setup. You can change it, if you like.