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[Alan Pevec <1656276@xxxxxxxxxxxxxxxxxx>]

** Also affects: packstack
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1656276

Title:
  Error running nova-manage  cell_v2 simple_cell_setup when configuring
  nova with puppet-nova

Status in OpenStack Compute (nova):
  In Progress
Status in OpenStack Compute (nova) newton series:
  New
Status in Packstack:
  New
Status in puppet-nova:
  New
Status in tripleo:
  Triaged

Bug description:
  When installing and configuring nova with puppet-nova (with either
  tripleo, packstack or puppet-openstack-integration), we are getting
  following errors:

  Debug: Executing: '/usr/bin/nova-manage  cell_v2 simple_cell_setup --transport-url=rabbit://guest:guest@172.19.2.159:5672/?ssl=0'
  Debug: /Stage[main]/Nova::Db::Sync_cell_v2/Exec[nova-cell_v2-simple-cell-setup]/returns: Sleeping for 5 seconds between tries
  Notice: /Stage[main]/Nova::Db::Sync_cell_v2/Exec[nova-cell_v2-simple-cell-setup]/returns: Cell0 is already setup.
  Notice: /Stage[main]/Nova::Db::Sync_cell_v2/Exec[nova-cell_v2-simple-cell-setup]/returns: No hosts found to map to cell, exiting.

  The issue seems to be that it's running "nova-manage  cell_v2
  simple_cell_setup" as part of the nova database initialization when no
  compute nodes have been created but it returns 1 in that case [1].
  However, note that the previous steps (Cell0 mapping and schema
  migration) were successfully run.

  I think for nova bootstrap a reasonable orchestrated workflow would
  be:

  1. Create required databases (including the one for cell0).
  2. Nova db sync
  3. nova cell0 mapping and schema creation.
  4. Adding compute nodes
  5. mapping compute nodes (by running nova-manage cell_v2 discover_hosts)

  For step 3 we'd need to get simple_cell_setup to return 0 when not
  having compute nodes, or having a different command.

  With current behavior of nova-manage the only working workflow we can
  do is:

  1. Create required databases (including the one for cell0).
  2. Nova db sync
  3. Adding all compute nodes
  4. nova cell0 mapping and schema creation with "nova-manage cell_v2 simple_cell_setup".

  Am I right?, Is there any better alternative?

  
  [1] https://github.com/openstack/nova/blob/master/nova/cmd/manage.py#L1112-L1114

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