Check_by_ssh benchmarks

[Sean Knox]

On UNIX platforms, you can use the net-snmp implementation (formally 
ucd-snmp). Windows 2000 has decent SNMP support built in, which you can 
extend (see http://snmpboy.msft.net/).

One caveat with net-snmp, however, is it is a royal pain to add MIBS- 
you have to recompile the agent and tools with support for your MIB. (if 
there is an easier way, someone PLEASE fill me in :)

Sean

Richard Wu wrote:

>Karl:
>
>The SNMP need much less CPU power than check_by_ssh, but how do you get the proper agent across the unix platform? check_by_ssh can utilize the exsiting nagios plugins, is there a way for snmp agent to use those plugins?
>
>Richard Wu
>
>
>-----Original Message-----
>From: Karl DeBisschop [mailto:karl at debisschop.net]
>Sent: Friday, November 01, 2002 5:48 AM
>To: Sean Knox
>Cc: Nagios Users
>Subject: Re: [Nagios-users] Check_by_ssh benchmarks
>
>
>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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