check_nrpe problem with dynamic ip

[J. Bakshi]

Assaf Flatto wrote:
> you can write a simple script that query the new dns/ip address of the nagios 
>
>  ping nagios.foo.com |head -1 | awk '{print $3}' |tr -d '(' ')'
>
> this will give the ip ,take the ip and replace that in the nrpe.cfg 
>
> and run the script in the cron every 2 days to make sure it gets the new ip .
>   

Hi Assaf,

I am afraid to say, but i can't understand its utility.
how this script help the remote nrpe daemon a.k.a  "/etc/nagios/nrpe.cfg"
to know the IP of my local machine ? The "allowed_hosts" needs to know the
IP of my local machine so that I can use nrpe_check command from my
local machine.

many thanks

> Assaf
>
> On Monday 01 September 2008 10:20:32 J. Bakshi wrote:
>   
>> Assaf Flatto wrote:
>>     
>>> On Monday 01 September 2008 09:57:30 J. Bakshi wrote:
>>>       
>>>> Hello All,
>>>>
>>>> The remote server where I have installed nrpe, the /etc/nagios/nrpe.cfg
>>>> has allowed_hosts=127.0.0.1,122.161.137.217
>>>>
>>>> 122.161.137.217 is the IP of my local nagios monitoring machine.
>>>> I put this IP after checking my machine by whatismyip.com
>>>> My ISP provides dynamic IP. Is there any way to tell nagios to permit
>>>> nrpe connection from
>>>> all ?
>>>>
>>>> thanks
>>>>         
>>> Is your nagis machine ip changes all the time ?
>>> or is it your devices Ip that is changing ?
>>>       
>> Hi Assaf,
>> thanks for your kind response.
>>
>> yes the local machine where the nagios is installed has dynamic address.
>> The Ip changes after every 2/3 days.
>> Hence I have to change the "allowed_hosts=" parameter accordingly at the
>> remote machine running nrpe daemon.
>> How can I solve this problem ?
>>
>> thanks
>>
>>     
>>> You do not need to tell nagios to permit the connection . you need to
>>> tell the nrpe on all the hosts you are checking that the nagios host's ip
>>> has been changed and has a new .
>>>
>>> As far as i know there is no automated plugin , what you can do is write
>>> a script to query the dns of your nagios and replace the existing IP with
>>> the new result .
>>>
>>> Assaf
>>>
>>>
>>>
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Joydeep Bakshi, Linux System Admin
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