Problem with SNMP plugin

[blinker86]

Hi
I'm newbie in using Nagios, I've just installed my first server and I'm doing my tests with my switches. But I have a problem when I want to check the status of the port:

(No output on stdout) stderr: execvp(/usr/local/nagios/libexec/check_snmp, ...) failed. errno is 2: No such file or directory

I'm install the last plugins but the plugin check_snmp not appear.

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[root@tecmint nagios]# cd /root/nagios
[root@tecmint nagios]# cd nagios-plugins-2.0.3
[root@tecmint nagios]# ./configure --with-nagios-user=nagios --with-nagios-group=nagios
[root@tecmint nagios]# make
[root@tecmint nagios]# make install

Could you help me?

[tmcdonald]

I see you are on plugins v2.0.3. What OS and version is this running on? And what Nagios version?

[blinker86]

I read about the problem and I solved the problem:

Hi
check_snmp is part of the nagios-plugins but it won't compile it if you don't have net-snmp, as indicated in the REQUIREMENTS file included with nagios-plugins...

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[root@localhost nagios-plugins-1.4.11]# cat REQUIREMENTS

    Nagios Plugin Requirements
    --------------------------

    Some plugins require that you have additional programs and/or
    libraries installed on your system before they can be used. Plugins
    that are dependent on other programs/libraries that are missing are
    usually not compiled. Requirements for various plugins are listed
    below...
    ...
    check_snmp:
    - Requires the NET-SNMP package available from
    http://net-snmp.sourceforge.net/
    ...
    .

Install net-snmp and recompile the plugins, then you should have check_snmp.

Now I have othe problem. I need to check my switch Cisco SG300-52 but I have the following error when I want to see the status:

External command error: Timeout: No Response from 10.120.5.31:161.

I've defined my host:

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define host{
        use             generic-switch          ; Inherit default values from a template
        host_name       SW03                    ; The name we're giving to this switch
        alias           Switch SG300-52         ; A longer name associated with the switch
        address         10.120.5.31             ; IP address of the switch
        hostgroups      switches                ; Host groups this switch is associated with
        }

And the services

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# Create a service to PING to switch

define service{
        use                     generic-service                 ; Inherit values from a template
        host_name               SW03                            ; The name of the host the service is associated with
        service_description     PING                            ; The service description
        check_command           check_ping!200.0,20%!600.0,60%  ; The command used to monitor the service
        normal_check_interval   5                               ; Check the service every 5 minutes under normal conditions
        retry_check_interval    1                               ; Re-check the service every minute until its final/hard state is determined
        }

# Monitor uptime via SNMP

define service{
        use                     generic-service                 ; Inherit values from a template
        host_name               SW03
        service_description     Uptime
        check_command           check_snmp!-C public -o sysUpTime.0
        }

# Monitor Port 1 status via SNMP

define service{
        use                     generic-service                 ; Inherit values from a template
        host_name               SW03
        service_description     Port 1 Link Status
        check_command           check_snmp!-C public -o ifOperStatus.1 -r 1 -m RFC1213-MIB
        }

Could you help me?

[sreinhardt]

Have you opened and configured snmp on that device? We can test with:

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nmap -sU -p 161 10.120.5.31

[blinker86]

Yes, the snmp is avaible

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[root@nagios ~]# nmap -sU -p 161 10.120.5.31

Starting Nmap 5.51 ( http://nmap.org ) at 2014-06-30 16:16 PET
Nmap scan report for 10.120.5.31
Host is up (0.0031s latency).
PORT    STATE SERVICE
161/udp open  snmp
MAC Address: 6C:20:56:85:E1:4D (Unknown)

Nmap done: 1 IP address (1 host up) scanned in 0.47 seconds

[Box293]

Have you configured that Cisco device with the communiity name public, which allows your Nagios Host read access?

A great test of SNMP is to perform a SNMP Walk.

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snmpwalk -c public -v 2c 10.120.5.31

[blinker86]

Thanks for the information. I configured the comunity name y the switch and now ir worked. Then i use the comand:

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snmpwalk -v1 -c public10.120.5.31 -m ALL .1 

To see the name of the interfaces

Tank you very much!