Open Stack

Hi Paul,

Your concern is a very valid one.

At the moment I believe the best way to handle a compute node failure is to
have /var/lib/nova/instances mounted under a shared filesystem such as NFS.

The VM data inside the nova database will need updated to point to another
compute node, but once that is done, the vm can be rebooted and launched on
the new one.

There is downtime involved, but the VM should be up to date to the point of
the compute node failure.

I would be interested to hear if anyone else has an alternative solution.

Thanks,
Joe


On Thu, Sep 6, 2012 at 1:16 PM, Paul Walton <paul.d.walton at gmail.com> wrote:

> Well, I guess my real question next is, what happens when a VM is running
> on a compute node and that node simply fails for whatever reason?  Does
> OpenStack have any way to detect a compute node failure, and attempt to
> migrate its VMs to another node?  I realize that the real VM and the
> migrated VM may be out of sync with each other, but I'm assuming that a
> relatively recent version of the VM is still present on the distributed
> file system to facilitate migration.
>
> Obviously, regular backups would be required for a real disaster recovery,
> but the VMs I'm talking about won't be changing much, and being a few
> minutes out of sync won't be a problem.
>
> On Thu, Sep 6, 2012 at 1:32 PM, Joe Topjian <joe.topjian at cybera.ca> wrote:
>
>> Hi Paul,
>>
>> OpenStack does not have anything like this yet. Anton Beloglazov has
>> created a blueprint from some research work he's done that would provide
>> such a feature:
>>
>>
>> https://blueprints.launchpad.net/nova/+spec/dynamic-consolidation-of-virtual-machines
>>
>> Thanks,
>> Joe
>>
>> On Thu, Sep 6, 2012 at 12:26 PM, Paul Walton <paul.d.walton at gmail.com>wrote:
>>
>>> Hello,
>>>
>>> I have a quick question about live migration of VMs.  I can see how to
>>> do this manually from the command line, i.e. if I want to move a VM from
>>> one compute node to another myself, but I was wondering if there is a way
>>> to have OpenStack do this automatically for me to balance the load across
>>> all the compute nodes dynamically?
>>>
>>> Thanks
>>>
>>> --
>>>
>>> Paul Walton
>>>
>>> University of Arkansas
>>> College of Engineering
>>> CSCE Technical Support Team
>>> J.B. Hunt Building, Room 440
>>>
>>> _______________________________________________
>>> OpenStack-operators mailing list
>>> OpenStack-operators at lists.openstack.org
>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators
>>>
>>>
>>
>>
>> --
>> Joe Topjian
>> Systems Administrator
>> Cybera Inc.
>>
>> www.cybera.ca
>>
>> Big data is coming to Canada. Join the welcome wagon.
>> *Cyber Summit 2012*
>> October 1-3, Banff
>> www.cybera.ca/summit2012
>>
>> Cybera is a not-for-profit organization that works to spur and support
>> innovation, for the economic benefit of Alberta, through the use
>> of cyberinfrastructure.
>>
>>
>
>
> --
>
> Paul Walton
>
> University of Arkansas
> College of Engineering
> CSCE Technical Support Team
> J.B. Hunt Building, Room 440
>
> _______________________________________________
> OpenStack-operators mailing list
> OpenStack-operators at lists.openstack.org
> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators
>
>


-- 
Joe Topjian
Systems Administrator
Cybera Inc.

www.cybera.ca

Big data is coming to Canada. Join the welcome wagon.
*Cyber Summit 2012*
October 1-3, Banff
www.cybera.ca/summit2012

Cybera is a not-for-profit organization that works to spur and support
innovation, for the economic benefit of Alberta, through the use
of cyberinfrastructure.
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