Problems with check_by_ssh

[Marc Powell]

> -----Original Message-----
> From: nagios-users-admin at lists.sourceforge.net [mailto:nagios-users-
> admin at lists.sourceforge.net] On Behalf Of Heiko Jaberg
> Sent: Thursday, March 16, 2006 8:54 AM
> To: nagios-users at lists.sourceforge.net
> Subject: [Nagios-users] Problems with check_by_ssh
> 
> Hi,
> 
> I encounter some problems using check_by_ssh.
> Im trying to grep some version information from a header file on a
> remote host.
> 
> Both of the following command lines generate the desired information
> when called
> directly from the shell. But only the second line works when scheduled
> by Nagios.
> The second one produces the error "No output".
> 
> Whats wrong here ?
> 
> 
> 1.)
> command_line    $USER1$/check_by_ssh  -i
/export/home/nagios/.ssh/id_rsa
> -l user -H $HOSTADDRESS$  -C 'if [ -e /usr/local/ACE/VERSION ]; then
> echo `head -1 /usr/local/ACE/VERSION`; else echo No ACE found; fi'
> 
> 2.)
>  command_line    $USER1$/check_by_ssh  -i
> /export/home/nagios/.ssh/id_rsa -l user -H $HOSTADDRESS$  -C 'head -1
> /usr/local/ACE/VERSION'

While not specifically addressing your question, you're using the
check_by_ssh plugin in an unintended manner. It's designed to execute
Nagios plugins on remote hosts and simply acts as a proxy for the plugin
return code and output. As such, the command you are running must comply
with the plugin output standards in order to work correctly with
check_by_ssh and Nagios --

http://nagiosplug.sourceforge.net/developer-guidelines.html#PLUGOUTPUT

You'll need to pay special attention to exiting with the correct exit
code and only 1 line of output (you've got the latter covered). That
might change your approach some and negate the need to troubleshoot
further. 

I suspect that you might be encountering a permissions problem related
to /usr/local/ACE/VERSION or an environment issue where 'head' isn't in
the default path. Try specifying the full path to head.

--
Marc


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