Nagios Support Forum

Hi all,

I'm having trouble with getting the SNMP to work with Nagios. I have Nagios® Core™ Version 4.0.8 on a Ubuntu Linux 14.04.1

The SNMP version is snmpd 5.7.2

I have it installed, I have cacti Installed in the same machine and the SNMP works fine with it, it captures traffic and read the Cisco devices with cacti, so, I have discarded Firewall issues or connectivity.

When I run $ sudo snmpwalk localhost -v 1 -c public , the command works fine and gives me the information on the server.

When I run $ sudo snmpwalk 1xx.x9.x2.x6 -c anything -v1

I get:
Timeout: No Response from 1xx.x9.x2.x6

If I run the snmp_check command from nagios libexec I get:

sudo ./check_snmp -H 1xx.x9.x2.x6 -C anything -o ifOperStatus.1 -P 1
External command error: Timeout: No Response from 1xx.x9.x2.x6:161.


I had removed the SNMP software several times, and install it again.

$ sudo /usr/sbin/snmpd -f
Error opening specified endpoint ""
Server Exiting with code 1


The configuration is the following..

***** /etc/snmp/snmpd.conf*****

###############################################################################
# Access Control
###############################################################################

com2sec readonly localhost public

group MyROGroup v1 readonly
group MyROGroup v2c readonly

view all included .1 80

access MyROGroup "" any noauth exact all none none

syslocation Wonderland
syscontact Alice


###############################################################################
# Embedded Subagents
###############################################################################

#perl do "tests/check_snmp_agent.pl";




************************ /etc/default/snmpd***********************************************************

# This file controls the activity of snmpd and snmptrapd

# Don't load any MIBs by default.
# You might comment this lines once you have the MIBs downloaded.
export MIBS=UCD-SNMP-MIB

# snmpd control (yes means start daemon).
SNMPDRUN=yes

# snmpd options (use syslog, close stdin/out/err).
SNMPDOPTS='-Lsd -Lf /dev/null -u snmp -g snmp -I -smux,mteTrigger,mteTriggerConf -p /var/run/snmpd.pid'

# snmptrapd control (yes means start daemon). As of net-snmp version
# 5.0, master agentx support must be enabled in snmpd before snmptrapd
# can be run. See snmpd.conf(5) for how to do this.
TRAPDRUN=no

# snmptrapd options (use syslog).
TRAPDOPTS='-Lsd -p /var/run/snmptrapd.pid'



If anyone has any ideas I really appreciated.. I've been struggling with this for quite long time now..

Thank you..

If the community string is set to public on the Cisco Device, try running the command like this to see if it works for you.

tgriep wrote:If the community string is set to public on the Cisco Device, try running the command like this to see if it works for you.

Code: Select all

sudo ./check_snmp -H 1xx.x9.x2.x6 -C public -o ifOperStatus.1 -P 1

Hi tgriep, Thank you for the quick response..

I did the test changing the SNMP community to "public" and it worked!!,

Then I did some more digging on it, and I found out that there are some symbols that if included in the SNMP community, the snmpd won´t take, like we have an SNMP community like ABC$2345Atha197% and it didn´t work, I changed it to the same removing the symbols, and it work, I change it to one like ABC$2345Atha197$ and it work, so the only thing common I found is that the percentage symbol (%) at the end doesn´t work.

Then I move to check the services with the snmpwalk, and the check_snmp from the command line , and I did got the correct result...

$sudo ./check_snmp -H 1xx.x9.x2.xx6 -C ABC$2345Atha197$ -o sysUpTime.0 -P1
SNMP OK - Timeticks: (1191209546) 137 days, 20:54:55.46 |

But I configure the command in the Nagios Object and I get the following error...

*****************configuration in Nagios object**********************************

define service{
use generic-service ; Inherit values from a template
host_name SWABC123
service_description Uptime
check_command check_snmp!-C ABC$2345Atha197$ -o sysUpTime.0 -P1
}


***********************RESULT IN NAGIOS WEBPAGE**************************

Current Status:
UNKNOWN
(for 0d 0h 46m 55s)
Status Information: check_snmp: Invalid SNMP version - 2c$
Usage:
check_snmp -H <ip_address> -o <OID> [-w warn_range] [-c crit_range]
[-C community] [-s string] [-r regex] [-R regexi] [-t timeout] [-e retries]
[-l label] [-u units] [-p port-number] [-d delimiter] [-D output-delimiter]
[-m miblist] [-P snmp version] [-L seclevel] [-U secname] [-a authproto]
[-A authpasswd] [-x privproto] [-X privpasswd]


I had tried with snmp version 1 and version 2c, and in the command line they work with the snmpwalk and with the check_snmp, but not in the Nagios webpage..

Some of the options I had tried..

check_snmp!-C ABC$2345Atha197$ -o sysUpTime.0 -P2c
check_snmp!-C ABC$2345Atha197$ -o sysUpTime.0 -P 1
check_snmp!-C ABC$2345Atha197$ -o sysUpTime.0


When I remove the -P 1 from the command in the Nagios Configuration, I get the following error..

External command error: sysUpTime.0$: Unknown Object Identifier (Sub-id not found: sysUpTime -> 0$)


If you have any more advice.. I would really appreciated.. your help has been really great.. and I feel like I'm one step closer..

Thank you..

Hi Mauusss

By default the core install's check_snmp command definition is not configured to handle passing in the community string.

in /usr/local/nagios/etc/commands.cfg change the line that looks like this to this Then change your service definition check_command line to this: Be aware that if you're already using that check_snmp command elsewhere this will likely break it so you may even want to just define a totally new command in your commands.cfg file

Thank you.. jdalrymple!!

It worked just fine!!..

What I did so I can use the check_snmp command with other services was that in the /usr/local/nagios/etc/commands.cfg I create a new command like this..
and in the service definition, I define it like this..
now is working perfect..

Thank you again.. great help