Nagios Support Forum

Hi,

I am currently trying to query a gude Power Control Board via SNMP. Not that special yet. But check_snmp just runs into a timeout.

See this:

#> check_snmp -H myhost -p 1234 -o iso.3.6.1.4.1.28507.38.1.3.1.2.1.3.12 -C public -P 2c -v
/usr/bin/snmpget -Le -t 10 -r 5 -m ALL -v 2c [authpriv] myhost:1234 iso.3.6.1.4.1.28507.38.1.3.1.2.1.3.12
CRITICAL - Plugin timed out while executing system call

So I tried to execute the shown command:

#> /usr/bin/snmpget -Le -t 10 -r 5 -m ALL -v 2c -c public myhost:1234 iso.3.6.1.4.1.28507.38.1.3.1.2.1.3.12
iso.3.6.1.4.1.28507.38.1.3.1.2.1.3.12 = INTEGER: 1

Mhh.. strange. So I looked through the code. I found the execve call where the snmpget command is executed.
In the trace I can see this:

[pid 13503] execve("/usr/bin/snmpget", ["/usr/bin/snmpget", "-Le", "-t", "10", "-r", "5", "-m", "ALL", "-v", "2c", "-c", "public", "myhost:1234", "iso.3.6.1.4.1.28507.38.1.3.1.2.1.3.12"], [/* 23 vars */]) = 0

It's still stuck there.

If I take the command out of the trace and execute it everything works fine.

#> /usr/bin/snmpget -Le -t 10 -r 5 -m ALL -v 2c -c public myhost:1234 iso.3.6.1.4.1.28507.38.1.3.1.2.1.3.12
iso.3.6.1.4.1.28507.38.1.3.1.2.1.3.12 = INTEGER: 1

I'm really out of ideas how to debug this further.

Thanks in advance
Sebastian

What OS and release are you running the plugin from?
Can you run the plugin with the -V and post the version number? If the check times out, it could cause that error so try running the plugin with a longer timeout.
For 30 seconds, add this.

This is the Version

check_snmp v2.2.1 (nagios-plugins 2.2.1)

Yesterday I got a bit further in debugging. The problem seems to be somewhere in reading the snmp mibs.

If I do the check with '1.3.6...' instead of 'iso.3.6' everything works fine. I've also tried to sepcify the -m '' option. This also fixes the Problem.

But I still don't get why I can execute the command shown by check_snmp by hand, but not troughout the check itself.

Basti1508 wrote:But I still don't get why I can execute the command shown by check_snmp by hand, but not troughout the check itself.

do you mean with snmpget?

check_snmp isn't an arg for arg wrapper, they are different and you may need to specify a base mib doing it the other way