Newbie question - check_snmp syntax

[mrinal devadas]

Hi Patrick,
Thank you for the detailed explanation.

Yes, I am just polling SNMP for values. The switches provided in the
check_snmp service are values that the plugin seems to require. The SNMP
version is always 2c and the community string is public. If I do not specify
Œ-L noAuthNoPriv¹ the switch defaults to ŒauthPriv¹. I have now removed this
switch.

Also the delimiter used by check_snmp is ³=². If I use this delimiter in the
netapp.cfg file, nagios complains about a syntax error in the file. If Œ-m¹
is not specified it defaults to ŒALL¹. Is that a bad thing? I have also
changed Œ-m¹ to Œ-o¹.

What I found to be odd is that nagios seems to have picked up the value for
the OID at some time in the past and then lost it. From the nagios.log
file....
-----------------
05-15-2008 23:18:36] EXTERNAL COMMAND:
SCHEDULE_FORCED_HOST_CHECK;gx4;1210889913
[05-15-2008 23:18:14] EXTERNAL COMMAND:
SCHEDULE_FORCED_SVC_CHECK;gx3;Uptime;1210889891
[05-15-2008 23:17:50] EXTERNAL COMMAND:
SCHEDULE_FORCED_SVC_CHECK;gx2;Uptime;1210889868
[05-15-2008 23:16:33] SERVICE FLAPPING ALERT: gx1;Uptime;STARTED; Service
appears to have started flapping (22.8% change >= 20.0% threshold)
--------------------

On NetApp the only configuration setting is the define the server that is
going to receive the SNMP traps.

With the configuration updates the results are as below...
### commands.cfg
# 'check_snmp' command definition
define command{
        command_name    check_snmp
        command_line    $USER1$/check_snmp -H $ARG1$ -P 2c -d ! -o $ARG2$
        }

### netapp.cfg
define service{
    use            generic-service    ; Inherit values from a template
    host_name        gx3
    service_description    Uptime
    check_command        check_snmp!gx3!sysUpTime.0
    }

### command output 
Status Information:    SNMP problem - No data received from host
CMD: /usr/bin/snmpget -t 1 -r 5 -m ALL -v 2c [authpriv] gx3:161 sysUpTime.0


Regards,
Mrinal.



On 16/05/2008 01:44, "Patrick Morris" <patrick.morris at hp.com> wrote:

> On Thu, 15 May 2008, mrinal devadas wrote:
> 
>> > Hi all,
>> > Am attempting to setup a Nagios server to accept SNMP traps from a NetApp
>> > controller. Need help with the syntax to be used for check_snmp.
>> >
>> > My commands.cfg file has,
>> > define command{
>> >         command_name    check_snmp
>> >         command_line    $USER1$/check_snmp -H $ARG1$ -P 2c -L noAuthNoPriv
>> > -d ! -m $ARG2$
>> >         }
>> >
>> > My netapp.cfg file has,
>> > define service{
>> >         use                     generic-service ; Inherit values from a
>> > template
>> >         host_name               gx3
>> >         service_description     Uptime
>> >         check_command           check_snmp!gx3!sysUpTime.0
>> >         }
>> >
>> > I get the following error message on Nagios,
>> > Status Information:    SNMP problem - No data received from host
>> > CMD: /usr/bin/snmpget -t 1 -r 5 -m sysUpTime.0 -v 2c [authpriv] gx2:161
>> >
>> > What am I doing wrong?
> 
> First, a couple points:
> 
> NMP traps are not something you can get using check_snmp.  They are sent
> from a device to something that listens for SNMP traps, and aren't
> something you can poll for.  In the example you gave, however, it
> appears you're polling for the sysUpTime.0 OID from SNMP, which is not
> a trap, so maybe you're just using the wrong terminology. If you are
> trying to receive traps, though, your current approach will never work.
> 
> Now, if you're just polling SNMP for values, you've got a workable
> start. However, The result you say you're receiving in Nagios cannot be
> the result of the configs you've supplied.  You're also mixing commands
> in a way that doesn't make much sense. For example, you specify to use
> SNMP version 2, but also include the -L switch, which only applies to
> SNMP version 3.  You're also going to have trouble with the "-d !" part
> of the command line, probably, and I doubt you even need it.  You're
> also not specifying the OID you want to poll.  The "-m" flag specifies a
> MIB to load -- a MIB is generally a file containing information about
> the OIDs available on a device, but the "-o" switch is the one to use to
> specify the data you want returned.
> 
> It's also unclear what, if anything, you've done on the NetApp as far as
> SNMP configuration, so that could very well be a problem as well.
> 

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