Re: snmpget timeout when being run from a script

The exec handler is synchronous, so snmpd is stuck waiting for the script
to return a value.  It can't handle the request from the script while it's
waiting like this.

If your agent has the DISMAN-EXPRESSION-MIB support compiled in, in theory
it can do simple math like this.  In practice I've never used it.

  Bill

On Tue, Oct 21, 2014 at 11:51 AM, Krzysztof Szarlej <[email protected]>
wrote:

> Hi all!
>
> I have a strange problem. I want to monitor my Synology NAS Device. I
> created in snmpd.conf an exec statement for my sample script that has to
> run one snmpget and multiply the result by 4 to give me the correct value:
>
> exec synology_disk_usage /opt/bin/bash /usr/bin/diskusage.sh
>
> And the script looks like
>
> - -
> #!/opt/bin/bash
>
> value=`snmpget -v 1 -c public localhost
> HOST-RESOURCES-MIB::hrStorageSize.33 -O Qve`
> echo "$value * 4" | bc
> - -
>
> When I run it just from the shell then everything looks good:
>
> - -
> bash-3.2# /usr/bin/diskusage.sh
> 956787604
> - -
>
> But when I make an snmpwalk then the OID that should take the value out of
> the script gets snmp timeout:
>
> - -
> bash-3.2# snmpwalk -v 1 -c public localhost .1.3.6.1.4.1.2021.8.1
> iso.3.6.1.4.1.2021.8.1.1.1 = INTEGER: 1
> iso.3.6.1.4.1.2021.8.1.2.1 = STRING: "synology_disk_usage"
> iso.3.6.1.4.1.2021.8.1.3.1 = STRING: "/opt/bin/bash"
> Timeout: No Response from localhost
> - -
>
> The problem must be related to the snmpget because when I comment the
> snmpget in script, and for example add line
>
> value=123
>
> then the snmpwalk show me correct value (123 multiplied by 4). Any ideas
> why this can occcur? I am fighting with it since yesterday and I have no
> idea why is that.
>
> Regards,
> Krzysztof!
>
>
>
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