Large scale installation

[Jake Xu]

Also, you might want to find out the performance of your service checks.

The nagios profiler is a very good tool to find execution time of
individual services.

http://exchange.nagios.org/directory/Plugins/Network-and-Systems-Management/Nagios/Profiler-to-check-plugin-execution-time/details

On Mon, Jun 11, 2012 at 12:40 PM, Giorgio Zarrelli <zarrelli at linux.it>wrote:

> Hi,
>
> I suggest to review your installation. Try with the large installation
> tweaks http://nagios.sourceforge.net/docs/3_0/largeinstalltweaks.html.
>
> Then, check whether you need all your checks at 5 mins or you can move
> some of them to 10 mins pace.
>
> Then, review your check plugins: Perl plugins eat more memory and CPU
> cycles then C compiled checks. If they support EPN
> http://nagios.sourceforge.net/docs/3_0/embeddedperl.html, use it, it makes
> your plugin faster and lighter.
>
> Then, check your checks. Some checks return data slower then others. Let's
> say, SNMP checks are not lightning fast.
>
> Then, check your graphs. Graphing perfdata takes CPU cycles and uses
> memory. Do you need all your graphs?
>
> Then, get rid of NDOUtils. They are chocking all the way, not efficient,
> clumsy, old and heavy. If you want to store your data in MySQL, use Merlin
> instead.
>
> Anyway, did you tune your MySQL? Is it causing too much I/O? Is it
> munching too much RAM or CPU cycles?
>
> Did you tune your Apache or http server? Does it cope with your needs? Is
> it munching too much RAM or CPU cycles?
>
> If you want live infos about your hosts and services, let's say to use
> with Navis, grab MKlive: it's blazing fast and gives you access to the
> core Nagios process.
>
> Are you using a virtualized environment? If so, remember that I/O layer in
> virtualized environments has a poor performance, use fast and real disks
> and your I/O will drop dramatically.
>
> Try to move status.dat to /dev/shm. The latter is a ram disk ready to use
> and writing in ram is always faster then writing on disk.
>
> Avoid logging too much, it increases I/O and takes CPU and RAM.
>
> What iotop and iostat are telling you?
>
> What do you see in top or htop?
>
> If you can or wish, compile all from sources, it will go faster on your
> system.
>
> You can use passive checks with NSCA or NRDP to reduce load, even though I
> do not like them a lot.
>
> These are just few ideas that came to my mind.
>
>
> Let's talk about sharing load.
>
> You can use different methods:
>
> Merlin
> (http://www.op5.org/community/plugin-inventory/op5-projects/merlin): gives
> you loadbalancing and redundancy. I use it for Ninja, never used for load
> balancing and redundancy.
>
> DNX (http://dnx.sourceforge.net/): Something new, it's gaining momentum,
> good to offload the checks. Worth to give a try.
>
> Mod_gearman (http://labs.consol.de/lang/de/nagios/mod-gearman/): Love at
> first site :-) Easy, powerful, load balancing and fault tolerant. Compile
> gearmand with memcached support and all the result checks will go directly
> to ram, avoiding I/O on disk. It's really simple to setup, if one of the
> workers go down, the others will share its work. Be careful: security is a
> problem, there is not a good auth system, but using a VPN will solve the
> problem. Efficient, I use a virtual machine with 2 cores and 2 gb of ram
> to make about 5K checks. And the load is not a concern. You need more
> horse power? Add a worker. You have some checks timing out due to poor
> connections to the targets? Put a worker close to the target, but be
> careful, the timing, let's say the rta of a ping, will be from the worker
> perspective.
>
> Well, hope it helps.
>
>
>
>
>
>
>
>
>
>
>
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