On 01/08/16 at 12:33pm, John Garbutt wrote:
On 8 January 2016 at 08:17, 少合冯 <[email protected]> wrote:
Hi, all
Now I'm working on the migrations list/show API.
The new api defines migrations is a sub-collection of an instance.
GET v2.1/tenant_id/servers/server-id/migrations/migration-id
I need to support the new cell API to get a migration of a specified
instance.
get_migration_by_instance_and_id
I read up the nova cell doc.
http://docs.openstack.org/developer/nova/cells.html
It tells us that, the migrations table will be API-level.
The instances table is Cell-level.
So does that means that we can do live migration cross cells?
In sort, you can't currently live-migrate between cells.
So there is the current cells v1. When using cells v1 you will never
be able to move between cells. In addition, when using nova-network,
network assumptions generally mean IPs can't move between cells.
Assuming a global network the limitation is just within Nova. There is
no mechanism for moving instance data from one cell database to another.
And it's not something that will be added since v1 is in a freeze.
In cells v2, we were talking about ways that could happen. Its still
hard, because you would need to copy the instance record between one
cell database to another, with the API understanding how the move is
going. Complexity best avoided, if possible.
Cells v2 makes some architecture choices that will make it easier to
accomplish this. But it's not necessary to have for cells v2 so it's
not likely to be in place initially.
And also this will affect my code.
If the migrations is API-level, so I do not need a cell name to get the
migrations info from DB.
Or I need to get the cell name by the specified instance, and then get the
migrations info by _TargetedMessage.
Afraid I don't have enough context from the rest of your email to
answer these questions.
I'm not entirely clear on the question either, but if the migration is
in the api level database then you do not need a cell name to get the
migration from the db. The cell name is only used to route a request to
a cell database.
Thanks,
John
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