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Difference between revisions of "Nova-Cells-v2"

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** dansmith has a start on the docs here: https://review.openstack.org/#/c/420198/
 
** dansmith has a start on the docs here: https://review.openstack.org/#/c/420198/
 
** (diana will take this) On a side note, we should also have man pages for the cell_v2 commands because there is confusion around the inputs and outputs and how return codes should be treated, i.e. is 1 an error or not? Put the CLI docs here: http://docs.openstack.org/developer/nova/man/nova-manage.html
 
** (diana will take this) On a side note, we should also have man pages for the cell_v2 commands because there is confusion around the inputs and outputs and how return codes should be treated, i.e. is 1 an error or not? Put the CLI docs here: http://docs.openstack.org/developer/nova/man/nova-manage.html
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*** Reviews for those docs: https://review.openstack.org/#/q/status:open+project:openstack/nova+branch:master+topic:man
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*** Let me (diana_clarke) know if you want them changed in any way. I did not document every option, as that doesn't appear to be the precedent in these docs. I suspect it's supposed to just be high-level, and that you're suppose to refer to the actual CLI help for more information.
 
** alaski's older docs patch (which is probably out of date now but might be useful) is here: https://review.openstack.org/#/c/267153/
 
** alaski's older docs patch (which is probably out of date now but might be useful) is here: https://review.openstack.org/#/c/267153/
 
** Summary of current commands:
 
** Summary of current commands:

Revision as of 20:00, 17 January 2017

Nova Cells v2

Bugs

TODOs

  • The deployment/upgrade process needs to be documented in more than just the release notes.
    • dansmith has a start on the docs here: https://review.openstack.org/#/c/420198/
    • (diana will take this) On a side note, we should also have man pages for the cell_v2 commands because there is confusion around the inputs and outputs and how return codes should be treated, i.e. is 1 an error or not? Put the CLI docs here: http://docs.openstack.org/developer/nova/man/nova-manage.html
    • alaski's older docs patch (which is probably out of date now but might be useful) is here: https://review.openstack.org/#/c/267153/
    • Summary of current commands:
      • map_cell0: creates a cell mapping for cell0
      • simple_cell_setup: creates a cell mapping for cell0 and creates a cell mapping and associates hosts with it (requires unmapped compute hosts registered already). Intended as a lightweight way for non-cells-v1 users to setup cells v2 during an upgrade.
      • map_cell_and_hosts: creates a cell mapping and associates hosts with it (requires unmapped compute hosts registered already)
      • discover_hosts: associates unmapped hosts with an existing cell mapping (or all cell mappings if a specific cell isn't specified)
    • Commands TODO?:
  • Integrate the 'nova-status upgrade check' CLI into the CI/QA system (grenade).
  • Older tracking etherpads (these may be out of date):

Open Questions

  • Should the computes self-register with a cell when the compute_nodes record is created from the ResourceTracker? https://review.openstack.org/#/c/369634/
    • How would the computes know which cell to map to? We could add something to the model to flag a 'default' or 'staging' cell mapping, or put something into nova.conf on the compute node.
    • If we auto-register into a default/staging cell, how do we move hosts to other cells? nova-manage CLI?
  • Why can't we create an empty cell, i.e. a cell mapping with no computes? This is a fresh-install scenario.
    • Note that the nova-status upgrade check command does not consider it a failure if there are cell mappings but no compute nodes yet but simple_cell_setup does consider that a failure, see bug 1656276.
    • There has been a review up for this for awhile: https://review.openstack.org/#/c/332713/
      • This way, a fresh install would do something like: 'nova-manage cell_v2 map_cell0' 'nova-manage cell_v2 create_cell' and then once compute hosts are available, operator runs 'nova-manage cell_v2 discover_hosts'

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

References

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