Open Stack

Seems that this can be broken into 3 incremental pieces. First, would be 
great if the ability to schedule a single 'evacuate' would be finally 
merged (
https://blueprints.launchpad.net/nova/+spec/find-host-and-evacuate-instance
). Then, it would make sense to have the logic that evacuates an entire 
host (
https://blueprints.launchpad.net/python-novaclient/+spec/find-and-evacuate-host
). The reasoning behind suggesting that this should not necessarily be in 
Nova is, perhaps, that it *can* be implemented outside Nova using the 
indvidual 'evacuate' API. Finally, it should be possible to close the loop 
and invoke the evacuation automatically as a result of a failure detection 
(not clear how exactly this would work, though). Hopefully we will have at 
least the first part merged soon (not sure if anyone is actively working 
on a rebase).

Regards,
Alex




From:   Syed Armani <dce3062 at gmail.com>
To:     OpenStack Development Mailing List 
<openstack-dev at lists.openstack.org>, 
Date:   09/10/2013 12:04 AM
Subject:        Re: [openstack-dev] [nova] automatically evacuate 
instances on compute failure



Hi Folks,

I am also very much curious about this. Earlier this bp had a dependency 
on query scheduler, which is now merged. It will be very helpful if anyone 
can throw some light on the fate of this bp.

Thanks.

Cheers,
Syed Armani


On Wed, Sep 25, 2013 at 11:46 PM, Chris Friesen <
chris.friesen at windriver.com> wrote:
I'm interested in automatically evacuating instances in the case of a 
failed compute node.  I found the following blueprint that covers exactly 
this case:

https://blueprints.launchpad.net/nova/+spec/evacuate-instance-automatically


However, the comments there seem to indicate that the code that 
orchestrates the evacuation shouldn't go into nova (referencing the Havana 
design summit).

Why wouldn't this type of behaviour belong in nova?  (Is there a summary 
of discussions at the summit?)  Is there a recommended place where this 
sort of thing should go?

Thanks,
Chris

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