Processors required for Nagios

[Bishop, Dean]

Good morning,

  i am currently setting up a nagios system and am monitoring 1150 hosts
with 1 service per (just getting started).  i am running this on a piece of
crap p-II 350 with 384M.  i am also running a very small instance of MRTG
monitoring about 15-20 stats local and remote every 5 minutes.  It appears
that the MRTG is the real hog but i am definately maxing this box out.

  i have two problems.
1) server locks at 4:02a the day after alot of configuration work.  i have
been tracking this one down.  i know it is related to crontab and further
that it is caused by anacron.  i have moved my daily cron jobs around so
that they all run 20 minutes apart rather than the default which is for them
all to run at the same time (4:02a)  This alleviated most of the lockups
(which were happening arbitrarily) but i just had another lockup on Monday
so i am assuming that this was due to the weekly cronjobs (only
one-anacron).  this is as far as i have made it.

2) although i can successfully generate a basic circular status map, it
pretty much kills my server for 2-3 minutes.  Any other maps are out of the
question.

  i am not doing any notification other than e-mail so i can't speak for the
load of paging.

i am quite impressed though.  We are in the process of relocating our
department and due to a lack of project management, i am left without my
mainworkstation.  i have therefore been working on my live nagios server
instead and have not had any problems.

hope this helps,
dean

-----Original Message-----
From: Greg Vickers [mailto:g.vickers at qut.edu.au]
Sent: Monday, August 26, 2002 10:38 PM
To: nagios-users at lists.sourceforge.net
Subject: [Nagios-users] Processors required for Nagios


Hey all, I included the below to ask the correspondents:

What kind of processor are you running this system on and how do you find 
the processor utilization on this server? I ask because I am in the middle 
of sourcing a server for our section and are looking at a single processor 
P3 1.4 GHz with 512Mb ram (and RAID5 3*18Gb 10k rpm + hot swap etc etc *G*).

We will be monitoring up to 1000 hosts and a bucket load (I guess 
1500-2000) of services. (I actually hadn't thought about how many 
hosts/services we would be monitoring!) So for that kind of load, is a 
second processor warranted?

Thanks all,
Greg

p.s. just read through the tuning doc

 > am currently watching about 300 hosts with approaching 600 service
>There are some performance tuning options that you can apply.  This
>helped my memory out greatly.  I'm not 100% sure of the ramifications,
>but I haven't seen any ill effects from the first one.
>
>Apache defaults to 8 daemons running.  I changed this to 2 at work and 1
>at home and gained a large amount of memory back.
>
>You can also scale nagios to only run X number of checks at a time.
>Depending on your configuration and how often the checks occur, you can
>have nagios only perform 50 checks at a time for example.
>
>http://nagios.sourceforge.net/docs/1_0/tuning.html
>Check #3 on the list for info on deciding how to scale your checks back.
>
>Hope this helps....
>
>Andy
>
>-----Original Message-----
>From: nagios-users-admin at lists.sourceforge.net
>[mailto:nagios-users-admin at lists.sourceforge.net] On Behalf Of Rusch,
>Daniel
>Sent: Monday, August 26, 2002 9:34 AM
>To: 'Terry Simons'; Timo Koskela
>Cc: nagios-users at lists.sourceforge.net
>Subject: SPAM - RE: [Nagios-users] Nagios is running multiple daemons
>
>I posted a similar message a week or so ago and didn't get any response.
>On
>my system the number of processes running that are owned by nagios
>varies
>from a half dozen to over 100.  I assume that nagios is running
>multithreaded and spawning of sub-processes.  I have noticed that nagios
>will burry the box it is running on and then of course the number of
>processes owned by nagios increases dramatically as they pile up.  Check
>to
>see if nagios is over loading your system.  I logged uptime and ps -few
>|
>grep nagios | wc -l every five minutes.
>
>I posted my message to see what a "normal" number of processes should
>be,
>but received no replies.
>
>Dan
>
>-----Original Message-----
>From: Terry Simons [mailto:galimore at mac.com]
>Sent: Monday, August 26, 2002 7:13 AM
>To: Timo Koskela
>Cc: nagios-users at lists.sourceforge.net
>Subject: Re: [Nagios-users] Nagios is running multiple daemons
>
>
>I don't know the reason, but I have seen multiple copies of Nagios
>running.
>
>I haven't seen more than two, but it wasn't a parent/child
>relationship... there were actually two copies of Nagios running...
>
>I thought that maybe it had something to do with the way that Nagios
>parallelizes checks, but maybe not...
>
>Ethan?
>
>- Terry
>
>
>On Sunday, August 25, 2002, at 11:59  PM, Timo Koskela wrote:
>
> > Hi all,
> >
> > Has somebody had same problem as I with Nagios. If there is something
> > wrong in our LAN where nagios is running, or in firewall, example line
>
> > is cut to outer world Nagios start to run multiple daemons. Like
>couple
> > days ago when i checked there was about 20 copies of Nagios, and it
> > didin't work so well then, but when i killed the main pid, they all
> > died. Please let me know if you know the reason...
> >
> > Timo
> > Finland
> >
>Missing every moment and preparing for the next.
>
>
>
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=================================
Greg Vickers
Computer Systems Officer
Student Support and Systems
Teaching and Learning Support Systems, QUT
g.vickers at qut.edu.au
Ph: 07 3864 8276 Fax: 07 3864 5425
Mob: 0416 001 674 SD: 6147



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