check_by_ssh timeouts / how to work around?

[Matthew Pounsett]

>
> I believe this to be caused by the check itself is timing out. As when
> I try to login it will sometimes take up to a minute or two just to
> get a prompt.
>


As for setting the timeouts for that sort of thing, this is what I do.

In my resource.cfg:
--
# check_by_ssh timeout
$USER4$=10
--

.. and in my commands.cfg definitions..
---
# 'check_disk_remote' command definition
define command {
     command_name    check_disk_remote
     command_line    $USER1$/check_by_ssh -H $HOSTADDRESS$ -t $USER4$ - 
C "$USER1$/check_disk -w $ARG1$ -c $ARG2$ -p $ARG3$"
}
---

And I use the same $USER4$ definition for all of the check_by_ssh  
calls, so that it's easy to tune.

Have you looked into the reason for the long login delay though?  I  
think I'd start there.  A 60 second wait for ssh to get you a shell  
indicates some sort of problem.  Either the target machine is so  
resource starved that it can't negotiate the authentication and  
encryption, or you've got some other delay in there.  The most likely  
culprit to my mind is DNS -- ssh itself, login and your shell on the  
target machine might all be trying to do a reverse DNS lookup on the  
source of the connection.  If that's timing out, it could cause very  
long delays.   There are lots of other potential problems, but I'd  
start looking there.


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