openstack team mailing list archive

[Tiantian Gao <gtt116@xxxxxxxxx>]

Hi Alex,

I would like to have REST API in the end, which I can make this by clicking
on a web.

But in short term, a nova-manage script sounds good. Because the REST API
may be harder to debug. And by using nova-manage we can prove these action
(put-into-maintenance, evacuate, migrate, etc.) really work in host-failed
situation. And make these action more robust. Then we can think up some
helpful REST API to combine all these steps to recover an VM.

What do you think?


2013/4/21 Endre Karlson <endre.karlson@xxxxxxxxx>

> I would say that having worked in a enterprise environment before
> sometimes we would get calls from a tech wanting to do it asap or you just
> have the need to do it "now". It would be very nice to have a option to the
> command like "nova maintenance --evacuate <host>" or something similar
> which would basically put it into maintenance mode and evac it.
>
> Endre.
>
>
> 2013/4/19 Alex Glikson <GLIKSON@xxxxxxxxxx>
>
>>
>> Was great to see many stackers at the summit!
>>
>> Following-up on one of the design discussions, the consensus seemed to be
>> that the operation which puts a host in maintenance mode should probably
>> only disable further provisioning requests to that host, while the
>> orchestration of migrating the individual instances from that host should
>> be done separately, potentially even outside of Nova. One possible
>> approach
>> could be to use the admin API to list all the instances on a particular
>> host, and then to migrate each of them (potentially using the option not
>> to
>> specify the target host, in which case the new placement will be selected
>> by the scheduler). Similar approach may apply to recovery of instances
>> from
>> a failed host, using 'evacuate' API.
>>
>> It would be great to understand how people might want to have this
>> capability surfaced and consumed by the administrator. A script (somehow
>> shared with the community)? REST API? (provided by which component?) part
>> of nova-manage? something else?
>>
>> Would appreciate your feedback (especially if you manage OpenStack clouds
>> and is interested in this capability).
>>
>> Thanks,
>> Alex
>>
>> P.S. one additional item on our todo list is to enable usage of scheduler
>> hints when applying the individual migration operations
>> P.P.S. similar scenarios might be also implemented for Cinder storage
>> nodes, ones the new volume migration feature gets implemented
>>
>>
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