Open Stack

Hi All.
After spending a few days, making integration with Nova / Keystone / 
Glance etc, just to get Multizone working, surfing the nova code, asking 
in launchpad / IRC / lists, we've come into a hard conclusion : "You 
will not get Multizone working on Diablo, if you are using KVM as your 
hypervisor"

Why is that ?
Mainly, if you manage to configure Nova to authenticate with keystone, 
add child zones, get visibility of the zones via python-novaclient, etc, 
yo will get to a point where a so called : service_stats dictionary, is 
empty where supposed to be a list of compute nodes with their 
capabilities, and the nova-scheduler crashes ( ok, at least this is 
fixed in Diablo 2011.3.1 ).

So to have a little background about whats happening, heres the deal ...
Via "nova.compute.manager.periodic_tasks" this function calls 
"update_service_capabilities" that, at the same time it calls 
"nova.virt.driver.get_hosts_stats" every compute node, reports their 
capabilities to the scheduler, so the scheduler, can collect them and 
via the BaseScheduler, decide where an instance should be running.

The thing is, since the get_host_stats call is delegated to the virt 
layer, when you are using KVM as your hypervisor, this function is not 
implemented (line 489, of nova.virt.driver), only the XenServer driver 
has this method implemented.

So, if anyone implemented it, for KVM, please share it !
In mean time, we checked that since Milestone 2 in Essex, the compute 
nodes supposed to report their capabilities for KVM, so ...
we are testing ESSEX Milestone 3.

Cheers.

-- 
meli <www.mercadolibre.com>
*Alejandro Comisario *
*Infrastructure IT - #melicloud Cloud Builder*
Arias 3751, Piso 7 (C1430CRG)
Ciudad de Buenos Aires - Argentina
Cel: +549(11) 15-3770-1857
Tel : +54(11) 4640-8443
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