I don't understand the check_by_ssh plugin

[Marc Powell]

On Dec 5, 2008, at 11:55 AM, David Dyer-Bennet wrote:

> When I run it from the command line simply, I just get the output of  
> the
> remote command (as if the plugin was just passing it through).  I  
> see that
> I could cause it to produce errors based on how long it takes, but  
> nothing
> about how to actually use the output.

This is what check_by_ssh does. It's simply a transport mechanism to  
allow nagios to run a plugin on a remote host and receive that  
plugin's output. It does not perform any testing, just transport. The  
plugin that is being executed by check_by_ssh would be doing the  
testing that you're looking for. For example --

define command {
     command_name                   check_disk_remote
     command_line                   $USER1$/check_by_ssh -t 120 -l  
username -H $HOSTADDRESS$ -C "/home/monitor/libexec/check_disk  -t 40 - 
w 10% -c 5%"
     }

When nagios executes the check_disk_remote command, it will tell  
check_by_ssh to connect to $HOSTADDRESS$ as username and execute the  
command '/home/monitor/libexec/check_disk  -t 40 -w 10% -c 5%'.

check_disk is a nagios plugin that lives on the remote host. The  
plugin will execute and check_by_ssh will capture it's output and exit  
code and return those to nagios. Nagios will interpret those as if the  
check_disk plugin were run directly. If the check_disk plugin returns  
a non-OK state, nagios will see that as if it were run locally, the  
check_by_ssh transport is transparent as far as nagios is concerned.

In order for the ssh connection to work, you do need to configure  
SSH's authorized_keys functionality. You can limit the host allowed to  
connect without password as well as the specific command that is run  
based on the key.

--
Marc

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