[collectd] Need help for filter

AUVINET Andre Andre.AUVINET at nantesmetropole.fr
Fri Jan 4 08:24:51 CET 2013


Thank you for your answer.
No, I would like to filter more interfaces.

The idea is to examine a table an to filter the result.

For example , filter the inteface mgmt but leave other.


André Auvinet
Technicien réseaux & télécoms
Département général des ressources numériques
Nantes Métropole et Ville de Nantes
Tour Bretagne
44923 Nantes cedex 9
Tél. 02 40 99 93 59
Fax. 02 40 20 38 48

De : Tom Throckmorton [mailto:throck at gmail.com]
Envoyé : jeudi 3 janvier 2013 18:09
À : Bill Schwanitz; AUVINET Andre
Cc : collectd at verplant.org
Objet : Re: [collectd] Need help for filter

On Thu, Jan 3, 2013 at 10:33 AM, Bill Schwanitz <bilsch at gmail.com<mailto:bilsch at gmail.com>> wrote:

On Jan 3, 2013, at 10:15 AM, AUVINET Andre <Andre.AUVINET at nantesmetropole.fr<mailto:Andre.AUVINET at nantesmetropole.fr>> wrote:

> Yes,  I want "stop" target for interfaces I did not need.
> Something like :
> LoadPlugin "SNMP"
> <Chain "PreCache">
>  <Rule "Ignore_interfaces">
>    <Match "regex">
>      Plugin "^snmp$"
>      Type "if_octets"                >>>> I don't know
>       TypeInstance ""                >>>> I don't know
>    </Match>
>     <Target "stop">
>     </Target>
>  </Rule>
>  Target "write"
>  /Target
> </Chain>

Type is probably going to be your IF-MIB::ifOctets.526846912

Do you know how to find the interface index?
$ snmpwalk -v2c -c foo_comm_string foo_host IF-MIB::ifName
IF-MIB::ifName.526846656 = STRING: Ethernet104/1/44
IF-MIB::ifName.526846720 = STRING: Ethernet104/1/45
IF-MIB::ifName.526846784 = STRING: Ethernet104/1/46
IF-MIB::ifName.526846848 = STRING: Ethernet104/1/47
IF-MIB::ifName.526846912 = STRING: Ethernet104/1/48

I imagine you are going to need that. Its probably going to be dropped in to TypeInstance value whole like this

TypeInstance "IF-MIB::ifName.526846912"

again, just a guess - this is kinda new to me. I'm adding this back to the mailing list in case anyone else is more familiar.

I haven't tried filtering, but if you only need data for a single interface, then it can be done without the filter; in the 'Data' definition within the snmp plugin config, just specify the OID+index in the 'Values' and set 'Table' to false, which will lead to only the data for that interface being pulled rather than the plugin parsing the ifTable.  Assuming the index of that interface is 12345 on both chassis, something like:

  <Data "ifmib_if_octets32">
    Type "if_octets"
    Table false
    Instance "te-0-1"
    Values "IF-MIB::ifInOctets.12345" "IF-MIB::ifOutOctets.12345"

  <Host "Nexus_5548_1">
    Address ""
    Version 2
    Community "public"
    Collect "ifmib_if_octets32.12345" "ifmib_if_errors32.12345"
    Interval 120
  <Host "Nexus_5548_2">
    Address ""
    Version 2
    Community "public"
    Collect "ifmib_if_octets32.12345" "ifmib_if_errors32.12345"
    Interval 120

The instance will be appended to the value list, so in this example you'd end up with rrd filenames like 'ifmib_if_octets32-te-0-1', though you may also leave the instance blank.


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