[collectd] collectd Digest, Vol 125, Issue 21

[Jan Vítek]

Hi,

i had similar problem however I don't think my sollution is suitable for
you. One type of my devices returned "normal operation" and "active alarm"
strings instead of simple 0/1. I made custom alphabet of 40 characters and
changed thde snmp plugin. Now if it finds a string in returned gauge value
it takes first 11 characters and converts it to 32 bit integer. In the
frontend application I have simple parser to convert it back to string.

Advantage of this approach is that it lets you use threshold plugin on the
returned values or visualize them as a chart. I think main disadvantage is
the 11 characters constraint.  Other disadvantage is the need of
modification both collectd and frontend application.

I could make a patch from my sollution if you'd be interested.

Kind regards,
Jan Vitek



2016-02-29 12:00 GMT+01:00 <collectd-request at verplant.org>:

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> Today's Topics:
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>    1. how to collect string values with snmp plugin (Niels Tomey)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 29 Feb 2016 15:58:12 +0800
> From: Niels Tomey <niels at ixs.ph>
> To: collectd at verplant.org
> Subject: [collectd] how to collect string values with snmp plugin
> Message-ID:
>         <CALhsmHOTvbw-qz_a-=
> 5nL5X1FKd9o49LhHiDS3dvJpOVyb6n5w at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> I would like to have collectd parse text values such as those found in
> 'system' (sysName, sysContact, sysLocation and so on). While researching it
> seems that alphanumerical strings should be of the 'octet' type, however
> there doesn't appear to be a suitable DataSet in
> /usr/share/collectd/types.db by default.
>
> I can hardly imagine I'm the first one who wants to do this, but I can't
> find anything on the subject online so I might be looking completely wrong
> at this subject.
>
> When using snmpwalk I see the values I want to store, but when I ask
> collectd to get these values like so:
>
> <Data "sysName">
>                 Type "absolute"
>                 Table false
>                 Instance "SNMPv2-MIB"
>                 Values "sysName"
>         </Data>
>
> I can see in the log file that collectd gets the proper result, but doesn't
> know what to do with it.
>
> [2016-02-29 14:53:10] parse_value: Failed to parse string as absolute:
> (null).
> [2016-02-29 14:53:10] snmp plugin: csnmp_value_list_to_value: Parsing
> string as absolute failed: *hostname1*
> [2016-02-29 14:53:10] parse_value: Failed to parse string as absolute:
> (null).
> [2016-02-29 14:53:10] snmp plugin: csnmp_value_list_to_value: Parsing
> string as absolute failed: *hostname2*
>
> Do I need to define a custom data type for this, or is there something else
> I should do to get these results?
>
> Kind regards,
>
> Niels
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