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
