"Agentless" monitoring with Nagios?

[John A. Sullivan III]

On Mon, 2006-05-15 at 15:34 -0700, Keller, Steve wrote:
> Hi – 
> 
>  
> 
> We have a large SiteScope installation (we monitor several thousand
> servers with about 20 SiteScope machines) and are considering Nagios
> as a replacement.  One of the issues we have is that we cannot, for
> various (mostly political) reasons, install an agent on the hosts we
> monitor.  We have successfully tested agentless monitoring by using
> Perl plugins that SSH to the remote host and run a command, parsing
> the output.  However, we cannot run as many monitors per server as in
> our SiteScope installation because of the latency incurred by setting
> up and breaking down the SSH connection for EACH monitor.
> 
>  
> 
> So my question is, does anyone know of a reasonable approach to
> agentless monitoring using Nagios?  We are planning to try SSH4, which
> automatically keeps SSH connections open for later use, and forcing
> Nagios to run several scripts sequentlially against the same host.
> But this has the problem that a host which is down, or busy, could
> delay checking other hosts.  
> 
>  
> 
> We would like, for many reasons (not just $$$, although that’s a
> factor), to use Nagios, but having to install twice or three times as
> many servers to support it is out of the question.  Any advice
> gratefully accepted.
> 
>  
> 
> Thanks,
<snip>
Would it help to run several commands in the ssh tunnel - perhaps even
echoing strings for delimiters in the parsing,e.g., 

ssh user at server "command1;echo 'first command';command2"

-- 
John A. Sullivan III
Open Source Development Corporation
+1 207-985-7880
jsullivan at opensourcedevel.com

If you would like to participate in the development of an open source
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