check_by_ssh and Nagios communication

[Michael Loftis]

Error 127 generally means it couldn't execute, check the executable 
permissions on the check_by_ssh (needs to be executable by whomever is 
doing ssh checks)  check_by_ssh also has the path to ssh hard coded into 
it, so check to make sure it's looking for the right SSH executable and 
that this is also runnable by the right user, you'll need to probably do a 
strings /path/to/your/check_by_ssh and look for something like /usr/bin/ssh 
(as on my FreeBSD box).

Lemme know if this is more helpful!

--On Wednesday, January 22, 2003 10:08 AM +0100 VEGH Karoly 
<karoly.vegh at uta.at> wrote:

>
> Hi all,
>
> Im still having the same problme, by hand executed it works just fine, but
> i dont know how to strace nagios's actions. How to search the error?
>
> On Mon, 20 Jan 2003, VEGH Karoly wrote:
>
>> I run Nagios on a debian linux, and up to now i could solve all my
>> problems, but one: the check_by_ssh plugin works just perfect, if i call
>> it by hand, but in the webfrontend i see an errormessage, just like in
>> the log.
>>
>> Executed by hand:
>>
>> newmx4:/opt/nagios# su - nagios
>> nagios at newmx4:~$ /opt/nagios/libexec/check_by_ssh -H newmx4 -C \
>> '/opt/nagios/libexec/check_disk -w 15% -c 5%'
>> DISK OK - [6951632 kB (95%) free on /dev/md0] [17208 kB (78%) free on
>> /dev/md1] [2301668 kB (91%) free on /dev/md2]
>> nagios at newmx4:~$
>>
>> in my checkommands.cfg file is:
>>
>> # 'ssh_disk' command definition
>>         command_name    ssh_disk
>>         command_line
>>         command[ssh_disk]=/opt/nagios/libexec/check_by_ssh -H
>> $HOSTADDRESS$ -C '/opt/nagios/libexec/check_disk -w 15% -c 5%'
>> newmx4:/opt/nagios#
>>
>> but in /opt/nagios/var/log/nagios.log:
>>
>> [1043069066] Warning: Return code of 127 for check of service
>> 'REMOTE-DISK' on host 'newmx4' was out of bounds. Make sure the plugin
>> you're trying to run actually exists.
>>
>> I use:
>>
>> nagios-1.0
>> nagios-plugins-1.3.0-beta2
>> kernel 2.4.18-ac3
>> OpenSSH3.4p1
>>
>> the nagios user can authenticate itself between the machines wit RSA
>> public key.
>>
>> what do i do wrong?
>>
>> any help is appreciated.
>>
>> tia
>>
>> charlie
>
> --
> Vegh Karoly -  System Engineer - UTA - TIS.SAS.SDI
> Cynics says that Hungarians created America's Hollywood before
> other Hungarians less destructively created America's A-bomb.
> http://www.mek.iif.hu/kiallit/tudtor/tudos1/martians.html
>
>
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