Nova-Cells-v2

Nova Cells v2

Bugs

• https://bugs.launchpad.net/nova/+bug/1656276 - Error running nova-manage cell_v2 simple_cell_setup when configuring nova with puppet-nova
• https://bugs.launchpad.net/nova/+bug/1649341 - Undercloud upgrade fails with "Cell mappings are not created, but required for Ocata"
  • Fixed on master in Nova, backport proposed to stable/newton.

TODOs

• The deployment/upgrade process needs to be documented in more than just the release notes.
  • dansmith was going to work on a blog post to start this.
  • alaski's older docs patch (which is probably out of date now but might be useful) is here: https://review.openstack.org/#/c/267153/
• Integrate the 'nova-status upgrade check' CLI into the CI/QA system (grenade).
• Older tracking etherpads (these may be out of date):
  • https://etherpad.openstack.org/p/cellsV2-remaining-work-items
  • https://etherpad.openstack.org/p/nova-multiple-cells

Manifesto

http://docs.openstack.org/developer/nova/cells.html#manifesto

Testing

https://etherpad.openstack.org/p/nova-cells-testing

DB Table Analysis

https://etherpad.openstack.org/p/nova-cells-table-analysis

Scheduling requirements

https://etherpad.openstack.org/p/nova-cells-scheduling-requirements

Code Review

• https://review.openstack.org/#/q/topic:bp/cells-scheduling-interaction
• Otherwise see the cells v2 section in the Ocata review priorities etherpad: https://etherpad.openstack.org/p/ocata-nova-priorities-tracking

References

• Note the original cells wiki is here: https://wiki.openstack.org/wiki/Blueprint-nova-compute-cells
• Kilo design summit etherpad: https://etherpad.openstack.org/p/kilo-nova-cells
• nova-specs: https://review.openstack.org/#/q/status:open+project:openstack/nova-specs+branch:master+topic:bp/cells-instance-mapping,n,z
• Flow diagrams: http://paste.openstack.org/show/144068/
  • https://etherpad.openstack.org/p/nova-cells-flow-diagram commentable version