Hi Enrique,
This bp [1] may cover the uses cases you are proposing. ( maybe not
using ceilometer )
Also, you can take a look at openstack-neat [2] ( outside project ),
that try to achieve something similar, but seems to be outdated.
There's another initiate to have an external scheduler (GANTT) , so
maybe there could be some place there for this kind of functionality.
[1]
https://blueprints.launchpad.net/nova/+spec/resource-optimization-service
[2] http://openstack-neat.org
El 09/04/2014 11:41 a.m., Henrique Truta escribió:
Hello, everyone!
I am currently a graduate student and member of a group of
contributors to OpenStack. We believe that a dynamic scheduler could
improve the efficiency of an OpenStack cloud, either by rebalancing
nodes to maximize performance or to minimize the number of active
hosts, in order to minimize energy costs. Therefore, we would like to
propose a dynamic scheduling mechanism to Nova. The main idea is using
the Ceilometer information (e.g. RAM, CPU, disk usage) through the
ceilometer-client and dinamically decide whether a instance should be
live migrated.
This might me done as a Nova periodic task, which will be executed
every once in a given period or as a new independent project. In both
cases, the current Nova scheduler will not be affected, since this new
scheduler will be pluggable. We have done a search and found no such
initiative in the OpenStack BPs. Outside the community, we found only
a recent IBM announcement for a similiar feature in one of its cloud
products.
A possible flow is: In the new scheduler, we periodically make a call
to Nova, get the instance list from a specific host and, for each
instance, we make a call to the ceilometer-client (e.g. $ ceilometer
statistics -m cpu_util -q resource=$INSTANCE_ID) and then, according
to some specific parameters configured by the user, analyze the meters
and do the proper migrations.
Do you have any comments or suggestions?
--
Ítalo Henrique Costa Truta
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