openstack/watcher-specs
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8f7001f5cad94909fbe3bee92dd999a56fd48cb1
watcher-specs/specs/2025.2/implemented/host-maintenance-strategy-disable-migration.rst
Douglas Viroel 8f7001f5ca Add 2026.1 spec dirs and move specs implemented in 2025.2 
Update this repository to include 2026.1 directories for specs.
Includes a spec template for 2026.1 that is based on the previous
release one.
Moves the implemented specs in 2025.2 to the "implemented" dir.

Change-Id: I08e8315672d96636325328b2b6f1d74a39cf75f8
Signed-off-by: Douglas Viroel <viroel@gmail.com>
2025-09-08 15:29:38 -03:00

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Host maintenance strategy disable migration

Include the URL of your launchpad blueprint:

https://blueprints.launchpad.net/watcher/+spec/host-maintenance-strategy-disable-migration

Problem description

Host maintenance is a migration strategy designed for maintaining a compute node. It triggers either live or cold migration for all instances on the node, assuming that both migration methods are available. However, this may not apply to deployments where live or cold migration is not supported.

Use Cases

When using host maintenance strategy:

  • As a Cloud Administrator, if live migration is supported in my OpenStack deployment. I want to apply live migration to the instance.
  • As a Cloud Administrator, if live migration is not supported in my OpenStack deployment, but cold migration is supported. I want to apply cold migration to the instance.
  • As a Cloud Administrator, if both live migration cold migration are not supported in my OpenStack deployment. I want to stop the instance.

Proposed change

Estimated changes are going to be in the following places:

  • Host maintenance strategy
    • Input parameters disable_cold_migration and disable_live_migration to disable the migration.
    • If disable_live_migration is given:
      • This tell the strategy the live migration shouldn't be considered during planning.
      • The instances in active status will be stopped.
      • If disable_cold_migration is not given, migrate all the SHUTOFF instances, including the instances stopped by previous operation.
    • If disable_cold_migration is given, this tell the strategy the cold migration shouldn't be considered during planning.
  • New stop actions in applier
    • Action to stop the instance

Alternatives

None

Data model impact

None

REST API impact

Two new input parameters for host maintenance strategy.

Security impact

None

Notifications impact

None

Other end user impact

Two new input parameters for host maintenance strategy, the behavior is expected as the same if no parameters are provided, so no breaking change.

Performance Impact

None

Other deployer impact

None

Developer impact

None

Implementation

Assignee(s)

Primary assignee:

<jneo8>

Work Items

  1. New applier action to stop the instance.
  2. Modify the function which creates migration action for instance.

Dependencies

Testing

  • Unit tests on the Watcher Decision Engine and Applier.
  • Integration tests
    • Launch an audit with the disable_live_migration input parameter enabled.
    • Launch an audit with the disable_cold_migration input parameter enabled.
    • Launch an audit with both disable_live_migration, disable_cold_migration input parameters enabled.

Documentation Impact

Need to update Host Maintenance Strategy documentation.

References

None

History

None

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