Re: OT: Munin (was Re: Determining server load from client)

CAJ CAJ wrote:
>
>
> On 3/21/07, *Erik Jones* <erik(at)myemma(dot)com <mailto:erik(at)myemma(dot)com>> wrote:
>
>
> On Mar 21, 2007, at 4:13 PM, Tobias Brox wrote:
>
>> [Erik Jones - Wed at 09:31:48AM -0500]
>>> I use cacti (http://cacti.net) which does the same thing that
>>> munin
>>> does but in php instead. Here's what I use to db stats to it
>>> (again,
>>> php):
>>
>> I haven't tried cacti, but our sysadm has done a little bit of
>> research
>> and concluded "cacti is better". Maybe some day we'll move over.
>>
>> Munin is generating all the graphs statically every fifth minute,
>> while
>> cacti generates them on demand as far as I've understood. The munin
>> approach is pretty bloat, since one usually would watch the graphs
>> much
>> more seldom than what they are generated (at least, we do).
>> That's not
>> really an argument since CPU is cheap nowadays - but a real
>> argument is
>> that the munin approach is less flexible. One would like to
>> adjust the
>> graph (like, min/max values for both axis) while watching quite some
>> times.
>
> Well, by "default", Cacti polls all of the data sources you've set
> up every five minutes as well as that's how the docs instruct you to
> set up the cron job for the poller. However, with a little
> understanding of how the rrdtool rras work, you could definitely
> poll more often and simply edit the existing rras and datasources to
> expect that or create new ones. And, yes, the graph customization
> is pretty cool although for the most part the just map what's
> available from the rrdtool graph functionality. If you do decide to
> set up Cacti I suggest you go straight to the faq section of the
> manual and read the part about going from a simple script to a
> graph. The main manual is almost entirely centered on the built-in
> networking ( e.g. snmp) data sources and, as such, doesn't do much
> for explaining how to set up other data sources.
>
>
>
> Has anyone had experience setting up something similar with Nagios? We
> monitor servers using nagios and not having to install additional
> software (cacti/munin) for postgres resource usage monitoring would be
> great.

a lot of nagios plugins can supply performance data in addition to the
OK/WARNING/CRITICAL state information - there are a number of solutions
out there that can take that information and graph it on a per
hosts/server base automatically - examples for such addons are
nagiosgrapher and n2rrd(or look at www.nagiosexchange.org it has a large
number of addons listed).

Stefan