Upgrade controllers with no API downtime
Currently pretty much every major upgrade requires full shutdown for all neutron-server instances for the time while upgrade process is running. The downtime is due to the need to run alembic scripts that modify schema and transform data. Neutron-server instances are currently not resilient to working with older schema. We also don't make an effort to avoid 'contract' migrations.
The goal of the RFE is to allow upgrading controller services one by one, without full shutdown for all of them in an HA setup. This will allow to avoid public shutdown for API for rolling upgrades.
Blueprint information
- Status:
- Complete
- Approver:
- Rossella Sblendido
- Priority:
- High
- Drafter:
- None
- Direction:
- Approved
- Assignee:
- None
- Definition:
- Approved
- Series goal:
- Accepted for queens
- Implementation:
-
Implemented
- Milestone target:
-
pike-2
- Started by
- Armando Migliaccio
- Completed by
- Slawek Kaplonski
Related branches
Sprints
Whiteboard
Oct-31-2016(armax): to agressively accelerate as soon as ovo effort completes.
Sep-08-2016(armax): deferred to Ocata
Aug-08-2016(armax): dependent effort progressing. This is a multi-cycle effort.
This is waiting for https:/
Gerrit topic: https:/
Addressed by: https:/
Plan to support no-downtime upgrade for neutron-server
Addressed by: https:/
Forbid contract migration scripts for Ocata
Work Items
Dependency tree
* Blueprints in grey have been implemented.
