Check_by_ssh benchmarks

[Jeff McKeon]

Just lurking in the posts...

Is there more in depth documentation anywhere for how/why to use
check_by_ssh?

On Fri, 2002-11-01 at 08:48, Karl DeBisschop wrote:
> On Thu, 2002-10-31 at 17:09, Sean Knox wrote:
> > Currently we use check_by_ssh to check private resources (disk, uptime, 
> > etc) on a small group of machines, as opposed to using nrpe. As ssh uses 
> > a good deal more resources than nrpe, at what point would unreasonable 
> > to use ssh to check machines? For the sake of conversation, say the 
> > Nagios monitor is is a PIII 1gig with 256 megs of ram.
> 
> I seems like it's not often brought up, but when I wanted a lighter
> alternative, I switched to check_snmp, since each nagios server I use
> only operates within a fairly well firewalled environment.
> 
> I switched after about 100 services (10 each on 10 hosts). Not so much
> because of the load per say, but when ssh fails, it does so much less
> cleanly than snmp, in my experience.
> 
> Another reason is when a server is really hammered, say by a DOS attack,
> ssh may fail, while snmp still works. I've had this happen, where it
> took 15 minutes or more to get a session on ssh, but we were still able
> to minitor the box. When we finally got in, we shut the port down
> (typing blind because of the DOS) and everything cleared. But
> snmp/netsaint never failed, and gave us the info we needed to quickly do
> what was needed with ssh.
> 
> One other thing to keep in mind is that you can run multiple checks on
> one check_by_ssh invocation. That could keep ssh viable longer.
> 
> --
> Karl
> 
> 
> 
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