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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

Public bug reported:

This came up in the mailing list while answering some questions about
when/how various cells v2 and database related commands get run:

http://lists.openstack.org/pipermail/openstack-
discuss/2019-October/009937.html

Recent change https://review.opendev.org/#/c/671298/ was added to the
upgrade guide to mention that you can use the --config-file option with
the nova-manage db sync command to migrate the cell database schema per
cell database, in most cases that being cell0 and cell1. The same is
true for the online_data_migrations command since that does data
migrations for both the API DB and cell DB, and you would need to run it
per cell DB using the --config-file option with a config file whose
[database]/connection is configured for a given cell, e.g. cell0 or
cell1.

So I think the CLI guide should probably be updated for nova-manage and
the upgrades guide like in https://review.opendev.org/#/c/671298/. For
the CLI guide, it might be useful to just have a generic section about
using --config-file per cell database for commands that require a cell
database but don't have a kind of --all-cells option like the
archive_deleted_rows and purge commands.

** Affects: nova
     Importance: Undecided
         Status: New


** Tags: cells doc nova-manage upgrade

** Tags added: upgrade

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https://bugs.launchpad.net/bugs/1846527

Title:
  online_data_migrations docs don't mention using --config-file to run
  the migrations per cell db

Status in OpenStack Compute (nova):
  New

Bug description:
  This came up in the mailing list while answering some questions about
  when/how various cells v2 and database related commands get run:

  http://lists.openstack.org/pipermail/openstack-
  discuss/2019-October/009937.html

  Recent change https://review.opendev.org/#/c/671298/ was added to the
  upgrade guide to mention that you can use the --config-file option
  with the nova-manage db sync command to migrate the cell database
  schema per cell database, in most cases that being cell0 and cell1.
  The same is true for the online_data_migrations command since that
  does data migrations for both the API DB and cell DB, and you would
  need to run it per cell DB using the --config-file option with a
  config file whose [database]/connection is configured for a given
  cell, e.g. cell0 or cell1.

  So I think the CLI guide should probably be updated for nova-manage
  and the upgrades guide like in https://review.opendev.org/#/c/671298/.
  For the CLI guide, it might be useful to just have a generic section
  about using --config-file per cell database for commands that require
  a cell database but don't have a kind of --all-cells option like the
  archive_deleted_rows and purge commands.

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