[collectd] Collectd on RedHat with virtuall network devices !

Florian Forster octo at verplant.org
Sun Mar 12 01:38:22 CET 2006

Hello Michael,

On Sat, Mar 11, 2006 at 08:36:14PM +0100, Michael Theurl wrote:
> The main problem is the only rrd file for the eth1 interface have
> collected the bits !
> the other rrd are created but the rrd database is zero. I use the
> "traffic" file from the contrib folder.
> As a sample i checked the database state with "rrdtool info
> /var/lib/collectd/traffic-tap0.rrd"

that displays information about the database `layout' only. To check the
values stored in this layout use something like this:
-- 8< --
 octo at alice:~/build $ rrdtool fetch /var/lib/collectd/leeloo.lan.home.verplant.org/traffic-eth0.rrd AVERAGE -s -300
 timestamp    incoming          outgoing

 1142123100:  1.9956200000e+03  2.0372000000e+03
 1142123160:  1.7583166667e+03  1.0541666667e+03
 1142123220:  2.0173090909e+03  1.1511803030e+03
 1142123280:  5.8442757576e+02  6.6627136364e+02
 1142123340:  2.1038875758e+03  7.8401954545e+02
 1142123400:  8.6518242424e+02  6.5879878788e+02
 1142123460:  5.9996000000e+02  7.5366666667e+02
-- >8 --

If many `NaN's (Not a Number) are displayed, somethings is going wrong.
If there are just many very small values, it's likely working..

> is it Possible that the collectd have some problems with virtual
> network devices ?

collectd simply reads and interprets the content of </proc/net/dev>
(when running on Linux, that is). Take a look at that file and check if
the interfaces you're interested in are listed here. If the interface is
a virtual interface or a physical one doesn't matter, as long as it's
listed here (and doesn't contain a colon..).

> here my collectd.conf:

The config looks okay..

> Is there a sollution for this problem ?

Check the two points above and send what you found out, and there'll be
a good chance we'll get this sorted out ;)

Florian octo Forster
Hacker in training
GnuPG: 0x91523C3D
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