openstack team mailing list archive

[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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