[Nagiosplug-help] Fail to telnet NRPE port (5666)

[eugene]

Guy,

I got some question as below,

> On my hosts (RHEL3), I had to allow connections to NRPE from the Nagios 
> host in /etc/hosts.allow, so TCP wrappers do seem to affect access to 
> xinetd services (at least on RHEL3).

- Do you mean i need to allow the IP of my nagios server?
I had done it > ALL: X.X.X.X

> Looks good (I think)... how soon does the connection close after saying 
> 'Connected to ...'? If it is immediately, it may be something like TCP 
> wrappers, or the 'only from ...' line in your /etc/xinetd.d/nrpe file.

It disconnetec after few seconds (3-5 sec)


> Have you tried running the check_load command on the remote machine? Does 
> it work?

How to run it? what is the command? I thought it only can run on nagios 
server?

> If it does, what happens when you call the 'check_load' command on the 
> remote machine using check_nrpe on the Nagios host? Does it work?

1 more question,
Do I need to install nagios plugins in Remote machine? Cause i only install 
plugin in Nagios server

Thanks for the reply again :) Still need ur help

Regards,
Eugene

----- Original Message ----- 
From: "Guy Waugh" <gwaugh at scu.edu.au>
To: "eugene" <eugene at mnc.com.my>; <nagiosplug-help at lists.sourceforge.net>
Sent: Wednesday, May 18, 2005 10:18 AM
Subject: Re: [Nagiosplug-help] Fail to telnet NRPE port (5666)


> eugene wrote:
>> Nagios FAQ
>> http://www.nagios.org/faqs/viewfaq.php?faq_id=261&expand=false&showdesc=false I 
>> was thinking the cause of tcp wrapper, but actually i am running from 
>> xined, should be any tcp wrapper
>
> On my hosts (RHEL3), I had to allow connections to NRPE from the Nagios 
> host in /etc/hosts.allow, so TCP wrappers do seem to affect access to 
> xinetd services (at least on RHEL3).
>
>> ------------------------------------------------------------------------------------------
>>
>> I get this while telnet port 5666
>>
>> Trying X.X.X.X...
>> Connected to X.X.X.X.
>> Escape character is '^]'.
>> Connection closed by foreign host.
>
> Looks good (I think)... how soon does the connection close after saying 
> 'Connected to ...'? If it is immediately, it may be something like TCP 
> wrappers, or the 'only from ...' line in your /etc/xinetd.d/nrpe file.
>
>>
>> I do this at my NRPE client, is it a proper way?
>> 1) Create nrpe file > /etc/xinetd.d/nrpe
>>
>>        # default: on
>>        # description: NRPE
>>        service nrpe
>>        {
>>                flags           = REUSE
>>                socket_type     = stream
>>                wait            = no
>>                user            = nagios
>>                server          = /usr/local/nagios/nrpe
>>                server_args     = -c /usr/local/nagios/nrpe.cfg --inetd
>>                log_on_failure  += USERID
>>                disable         = no
>>                only_from       = 192.168.10.50
>>      }
>
> Looks good - did you SIGHUP xinetd after adding this file into 
> /etc/xinetd.d?
>
>>
>> 2) set port 5666 > /etc/services
>>    nrpe            5666/tcp                        # NRPE
>
> Looks good...
>
>>
>> 3) /usr/local/nagios/nrpe -c /usr/local/nagios/nrpe.cfg -i
>> ------------------------------------------------------------------------------------------
>>
>> I am using hard code from nrpe.cfg,
>> command[check_load]=/usr/local/nagios/libexec/check_load -w 15,10,5 -c 
>> 30,25,20
>
> Looks good, provided you are not using user-supplied arguments...
>
>>
>>
>> Define in Nagios server
>> 1) in checkcommands.cfg
>>
>> define command{
>>        command_name    check_nrpe
>>        command_line    $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$
>>        }
>
> Looks good, provided once again that you are not using user-supplied 
> args...
>
>>
>> 2) # Service definition
>> define service{
>>        use                            generic-service
>>
>>        host_name                      Testing
>>        service_description            Check Load
>>        is_volatile                    0
>>        check_period                   24x7
>>        max_check_attempts             3
>>        normal_check_interval          3
>>        retry_check_interval           1
>>        contact_groups                 Support-Team
>>        notification_interval          120
>>        notification_period            24x7
>>        notification_options           w,u,c,r
>>        check_command                  check_nrpe!check_load
>>        }
>
> Looks good to me as well.
>
>>
>>
>> ------------------------------------------------------------------------------------------
>>
>>
>> What are the things i left? Is there any mismatch of configuration
>
> Not that I can see...
>
> Have you tried running the check_load command on the remote machine? Does 
> it work?
>
> If it does, what happens when you call the 'check_load' command on the 
> remote machine using check_nrpe on the Nagios host? Does it work?
>
> Regards,
> Guy.
>
> <snip>
>
>