controlling tty

[Nate Johnson]

I am both executing the checks, and simply ssh'ing to the remote host 
as the nagios user.  ssh.com's ssh behaves the same way that openssh 
does, save for some minor differences not relevant to this discussion.

Thanks again,
Nate

On Friday, Dec 20, 2002, at 21:39 America/Indianapolis, Mike McClure 
wrote:

>
>
>> Maybe I wasn't clear enough about this in asking my question, but when
>> ssh'ing to each host *from the command line* and not *from the cgi
>> frontend* the checks succeed.  It is when nagios is doing the 
>> regularly
>> scheduled checks through the check_by_ssh plugin that the warning
>> message is returned to the cgi frontend.  The checks would have failed
>> when executing them manually from the command line if the hostkey of
>> the remote machine wasn't already stored in ~/.ssh/known_hosts.
>
> When you execute the checks from a shell, are you doing it as the 
> nagios user, or as
> another user?   When the nagios daemon executes them, it does so as 
> the nagios user
> (usually "nagios").
>
> Try "su - nagios", then ssh'ing to the host.  I haven't ever tried 
> ssh.com's version
> of ssh, but with OpenSSH, if it doesn't have the host's key in 
> known_hosts, it asks
> you if you want to add it, then it doesn't ever ask again (unless it 
> is changed).
>
>>
>> The only reference to this that I was able to find on the web was in
>> the netsaint list archives on geocrawler.  Someone asked the same
>> question that I did.  Unfortunately, the only answer posted to the 
>> list
>> was someone who noted that there was a bug in redhat's /bin/login 
>> (from
>> an earlier version of redhat than than the one I'm using).  They had
>> suggested update the linux-util rpm.  Anyway, I don't think that's the
>> issue here, and reading this e-mail list, it is obvious that others 
>> are
>> successfully using the check_by_ssh plugin.
>>
>> thanks for the help so far,
>> Nate
>>
>> On Friday, Dec 20, 2002, at 20:20 America/Indianapolis, Mike McClure
>> wrote:
>>
>>> I think the problem is that you don't have a host key for each of the
>>> remote hosts
>>> on your monitoring host, available to the user under which you run 
>>> the
>>> plugin.
>>>
>>> You'll need to get them, either manually by editing the "known_hosts"
>>> file, or by
>>> ssh'ing as the nagios user to each host and accepting the host key.
>>>
>>> Take a look at
>>> http://www.snailbook.com/faq/trusted-host-howto.auto.html for more
>>> details.
>>>
>>>> Please see below for answers to each of your questions.  Thanks so
>>>> much
>>>> for your time so far.
>>>>
>>>> ~nate
>>>>
>>>> On Fri, 20 Dec 2002 16:43:10 -0600 (CST) "Mike McClure"
>>>> <mmcclure at pneservices.com>
>>>> wrote:
>>>>
>>>>> What operating systems are you using?
>>>>
>>>> Redhat 7.3 on the nagios monitorring host
>>>> several other OS's on hosts being monitorred (but the situation is
>>>> the same on all)
>>>>
>>>>> What version of the plugins are you using?
>>>>
>>>> 1.3-beta1
>>>>
>>>>> Are you using the commercial version of SSH, or OpenSSH?
>>>>
>>>> ssh.com's ssh (although it is the non-commercial version).  For the
>>>> purposes of your question, I am using the commercial ssh.
>>>>
>>>>> SSHv2 or SSHv1?
>>>>
>>>> sshv2
>>>>
>>>>> How are you performing authentication?  .shosts?  RSA/DSA keys?
>>>>
>>>> I am using a keypair with a null passphrase.
>>>>
>>>>>> When doing remote checks through check_by_ssh, they work from the
>>>>>> command
>>>>>> line, but from the cgi interface, they return a warning status 
>>>>>> with
>>>>>> the
>>>>>> message:
>>>>>>
>>>>>>   warning: You have no controlling tty. Cannot read confirmation.
>>>>>>
>>>>>> Anyone know what I might be doing wrong?  Any advice would be 
>>>>>> great.
>>>>>>
>>>>>> Thanks,
>>>>>> Nate
>>>>>>
>>>>>>
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>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Mike McClure, CCIE # 5125, CISSP # 30232
>>>>> PNE Services, Inc. -  http://www.pneservices.com
>>>>> mmcclure at pneservices.com
>>>>> mobile: 913-636-5590
>>>>>
>>>>>
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>>>>>
>>>>>
>>>>
>>>>
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>>>
>>>
>>> --
>>> Mike McClure, CCIE # 5125, CISSP # 30232
>>> PNE Services, Inc. -  http://www.pneservices.com
>>> mmcclure at pneservices.com
>>> mobile: 913-636-5590
>>>
>>>
>>>
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>>>
>>>
>>
>>
>>
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>
>
> -- 
> Mike McClure, CCIE # 5125, CISSP # 30232
> PNE Services, Inc. -  http://www.pneservices.com
> mmcclure at pneservices.com
> mobile: 913-636-5590
>
>
>
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> _______________________________________________
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> Nagios-users at lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/nagios-users
>
>



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