Same status

Karl DeBisschop karl at debisschop.net
Wed Jan 15 02:39:59 CET 2003


On Tue, 2003-01-14 at 14:07, donavan nelson wrote:
> Hi Jim,
> 
> I started out trying to do everything with SNMP.  Just be aware that it can
> add extra services to your configuration.  As an example, for the 1 5 15
> minutes CPU load check, it's 3 SNMP services instead of just one.

You can check multiple OIDs in one check_snmp invocation

>   There were
> other things I couldn't figure out with SNMP, like checking that all processes
> on a box are less than 25M in size.

My grand plan includes some sort of calculation module that would allow
what you are describing. But it is clearly a ways off.

>   It's prolly good to know how to do SNMP
> checks, but I don't think they are the be all to monitoring.

I definitely agree with that. Each remote method has its ups and downs.
In a secure cluster, SNMP has a number of ups. But it does not solve
evrything.

> I've since backed off SNMP and have gone to letting the nagios plugins do the
> work where I can.
> 
> --
> Donavan Nelson
> 4wx Networks
> www.4wx.net
> 
> ---------- Original Message -----------
> From: "Carroll, Jim P [Contractor]" <jcarro10 at sprintspectrum.com>
> To: "'Karl DeBisschop'" <karl at debisschop.net>
> Sent: Tue, 14 Jan 2003 09:36:32 -0600
> Subject: RE: [Nagios-users] Same status
> 
> > I've been pondering SNMP as an alternative to NRPE.  If I were to 
> > take this approach, I presume I need the following:
> > 
> > - the SNMP software components need to be installed on the Nagios 
> > server as well as for any client I wish to monitor (should be 
> > obvious, but I didn't want to skip over this ;) - proper config of 
> > SNMP so that it's functioning client/server - the check_snmp plugin 
> > should be built properly - I'm guessing I need a MIB for whatever 
> > aspect I'm trying to monitor...?
> > E.g., o/s, hardware, specific application - the biggest gap is 
> > w.r.t. what a service definition would look like; if you could post 
> > a couple examples (eg, memory, disk) that would be most excellent, 
> > sir :)
> > 
> > For further reference, it would be great if you could take me 
> > through the creation of a single definition, from the "gee, I'd like 
> > to monitor service XYZ on host xyzygy" to looking up the MIB details 
> > (or snmpwalk or whatever's required), that'd be great!
> > 
> > TIA,
> > 
> > jc
> > 
> > > -----Original Message-----
> > > From: Karl DeBisschop [mailto:karl at debisschop.net]
> > > Sent: Monday, January 13, 2003 8:37 PM
> > > To: Chris Stankaitis
> > > Cc: Justin; Nagios Users
> > > Subject: Re: [Nagios-users] Same status
> > > 
> > > 
> > > On Mon, 2003-01-13 at 09:02, Chris Stankaitis wrote:
> > > > This is an active vs. passive check thing... An Active 
> > > check is one that 
> > > > is started on the nagios server.... some of these can handle remote 
> > > > hosts, ping, ssh, smtp, pop, http, time etc... those you 
> > > can run from 
> > > > nagios and everything will be happy for all your different hosts.
> > > > 
> > > > Things like current user, load, disk space,  processes, 
> > > can't be run 
> > > > from the nagios server with regards to collecting this 
> > > information from 
> > > > remote hosts by default.  to do this you need to set up 
> > > passive checks, 
> > > > and somehow get the information from the client to the host (nagios 
> > > > server) this can be acomplished by mutiple ways...
> > > > 
> > > > 1) NRPE - open connection runs on each clent, nagios 
> > > connects to the 
> > > > port and gets the info you want
> > > > 2) NSCA - open connection runs on NAGIOS server and clients send 
> > > > information to the nagios server encrypted
> > > > 3) check_by_ssh using the SSH's ability to execute commands to run 
> > > > commands on the client and pulls back results
> > > 
> > > If you are in an isolated LAN (i.e., you have a failrly 
> > > decent firewall
> > > and you put ACLs on your servers) there is also check_snmp. It's my
> > > personal favorite becuase it has great funtionality, near 
> > > zero setup in
> > > my RH73 servers, and very low overhead.
> > > 
> > > Justin's options are fine too - just missed one (I'm sure 
> > > there are more
> > > too).
> > > 
> > > --
> > > Karl
> > > 
> > > 
> > > 
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> ------- End of Original Message -------
> 
> 
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