Hi Yuanjing, some pointers inline.
2014-04-03 4:33 GMT+02:00 Yuanjing (D) <yj.y...@huawei.com>: > Hi > > I have a requirement of monitoring VMs, if a VM's meter like cpu_util > become too high, then system generate an alarm for this VM with meter > information. > > I have tested alarm function of ceilometer, below are commands I used to > create alarm object with meter and resource id or not: > ceilometer alarm-threshold-create --name alarm1 --meter-name cpu_util > --period 60 --evaluation-periods 1 --statistic avg --comparison-operator gt > --threshold 1 -q resource_id=757dadaa-0707-4fad-808d-81edc11438aa > ceilometer alarm-threshold-create --name alarm1 --meter-name cpu_util > --period 60 --evaluation-periods 1 --statistic avg --comparison-operator gt > --threshold 1 > > I have the following question: > If I have to define alarm object for every VM and every meter? > >From my comprehension, yes it's the good and the unique way > Take 100 VM and 2 meter cpu_util, memory_util as an example, I will have > to define 100*2 alarm objects for them. > I think if I just define alarm object with meter not but VM(resource_id), > then alarm evaluator will count all VM's meter. > your're right, Here your alarm will be trigered on the average of all samples in the period of all VMs .. which is not what you want I'm sure. > Another question produced by question above: I know that alarm evaluator > will process alarm object one by one, so too many alarm object may result > in performance problems too. > On which component have you observed a performance issue ? This should be better/mitigate if you deploy correctly multiple services involved in the alarm evaluation: at least the evaluator and the API. About the backend, I read there is some performance issue with SQL [1] but seems not about alarming but rather notifications handling. The prefered backends for performance should be MongoDB or Hbase (on multi nodes). > I am not a ceilometer programmer and I apologize if I am missing > something very obvious. > Can you give me some help to make me clear about them and how to implement > my requirement? > > Thanks > > > _______________________________________________ > OpenStack-dev mailing list > OpenStack-dev@lists.openstack.org > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev > > [1] http://lists.openstack.org/pipermail/openstack-dev/2014-March/030288.html
_______________________________________________ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
