[one-users] Host monitoring with snmp ?

[Ruben S. Montero]

Hi

This is a great idea indeed, and a great contribution for the
ecosystem ;) . Just a few thoughts about monitoring...

The MONITORING_INTERVAL is the time between to monitor actions in
OpenNebula. Each monitor action takes the ONLY THE LAST 10 hosts
monitored by the system. So if you have more than 10 hosts the hosts
are going to be monitored in approx ((num_hosts mod 10) + 1) *
monitoring_interval.

If that is not your case, please send us the output of oned.log...


Cheers

Ruben

On Thu, Apr 15, 2010 at 10:57 AM, Neil Mooney <neil.mooney at sara.nl> wrote:
> Hi All,
>
> I had some problems with host monitoring, namely that I could not
> decrease the cycle time to monitor a host.
> It is my understanding that we might need to monitor our hosts more
> often to get better / fairer scheduling.
>
> I changed HOST_MONITORING_INTERVAL setting to 10 seconds, but I could
> not realise a cycle time of less than 30 seconds...
>
> oneadmin at node15-one:~$ grep INTERVAL /etc/one/oned.conf
> #  HOST_MONITORING_INTERVAL: Time in seconds between host monitorization
> #  VM_POLLING_INTERVAL: Time in seconds between virtual machine
> monitorization
> HOST_MONITORING_INTERVAL = 10
> VM_POLLING_INTERVAL      = 60
>
> I wrote a script that tries to emulate the ruby monitoring script, but
> pulls the information directly from system snmp counters to
> This should mean a more real time status of each host and avoids parsing
> out, scp and ssh of the ruby script.
>
> Is host monitoring via snmp a good idea ? Perhaps its  faster / more
> scalable ?
>
> Example output using the ruby script from ONE:
>
> oneadmin at node15-one:~$ time
> /tmp/one-im/one_im-7a0979c4d3d29cded6cdb99498449870
> HYPERVISOR=kvm
> TOTALCPU=800
> CPUSPEED=2261
> TOTALMEMORY=24735424
> USEDMEMORY=10151572
> FREEMEMORY=24159416
> FREECPU=770.4
> USEDCPU=29.6
> NETRX=18837297726
> NETTX=328653416717
>
> Example output from my snmp script:
>
> real    0m3.531s
> user    0m0.000s
> sys     0m0.028s
> oneadmin at node15-one:~$ time scripts/onemonitor.sh node16-one
> HYPERVISOR=kvm
> TOTALCPU=800
> CPUSPEED=2270
> TOTALMEMORY=24735424
> USEDMEMORY=18889772
> FREEMEMORY=5845652
> FREECPU=0.00
> USEDCPU=800.00
> NETRX=513353459
> NETTX=3422880146
>
> real    0m0.039s
> user    0m0.012s
> sys     0m0.048s
> oneadmin at node15-one:~$ time scripts/onemonitor.sh localhost
> HYPERVISOR=kvm
> TOTALCPU=800
> CPUSPEED=2270
> TOTALMEMORY=24735424
> USEDMEMORY=9011744
> FREEMEMORY=15723680
> FREECPU=792.00
> USEDCPU=8.00
> NETRX=513356316
> NETTX=3422883584
>
> real    0m0.039s
> user    0m0.020s
> sys     0m0.040s
> oneadmin at node15-one:~$
>
> Cheers
>
> Neil
>
>
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>



-- 
Dr. Ruben Santiago Montero
Associate Professor (Profesor Titular), Complutense University of Madrid

URL: http://dsa-research.org/doku.php?id=people:ruben
Weblog: http://blog.dsa-research.org/?author=7