2.3 KiB
Replace cold migration to use Nova migration API
https://blueprints.launchpad.net/watcher/+spec/replace-cold-migrate-to-use-nova-migration-api
Problem description
Currently watcher implements instance cold migration by it's own for specifying destination node. The implementation includes instance creation. Since administrator runs watcher API, instance migrates to service project.
Use Cases
Migrate action executes instance cold migration if migration_type is cold.
Proposed change
Since v2.56, Nova migrate Server(migrate Action) API has host option. By replacing watcher_non_live_migrate_instance method in common/nova_helper.py to use the API, we can simply solve the problem.
Alternatives
It may be the alternative to create instance by temporary user in the project where instance is in. But this solution remains quota problem. During temporary user lives and reached quota limit, new user can not be created.
Data model impact
None
REST API impact
None
Security impact
None
Notifications impact
None
Other end user impact
None
Performance Impact
We may expect cold migration becomes faster because current implementation calls many Nova and Neutron API.
Other deployer impact
- Administrator can see migration by watcher using Nova List Migrations API.
Developer impact
None
Implementation
Assignee(s)
- Primary assignee:
-
<nakamura-h>
- Other contributors:
-
<None>
Work Items
- Replace watcher_non_live_migrate_instance method in common/nova_helper.py to use Nova migrate Server(migrate Action) API.
Dependencies
None
Testing
We should expect current test code can test this replacement.
Documentation Impact
None