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[Xavier Queralt <1297325@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

When booting an instance specifying the swap and/or ephemeral devices,
those will be created as a block device mapping in the database together
with the image and volumes if present.

If, instead, we rely on libvirt to define the swap and ephemeral devices
later from the specified instance type, those devices won't be added to
the block device mapping list.

To be consistent and to prevent any errors when trying to guess the
device name from the existing block device mappings, we should create a
mappings for those devices if present in the instance type. We should
create them from the API layer, before validating the block device
mappings and only if no swap or ephemeral device are defined by the
user.

** Affects: nova
     Importance: Medium
     Assignee: Xavier Queralt (xqueralt)
         Status: New

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https://bugs.launchpad.net/bugs/1297325

Title:
  swap and ephemeral devices defined in the flavor are not created as a
  block device mapping

Status in OpenStack Compute (Nova):
  New

Bug description:
  When booting an instance specifying the swap and/or ephemeral devices,
  those will be created as a block device mapping in the database
  together with the image and volumes if present.

  If, instead, we rely on libvirt to define the swap and ephemeral
  devices later from the specified instance type, those devices won't be
  added to the block device mapping list.

  To be consistent and to prevent any errors when trying to guess the
  device name from the existing block device mappings, we should create
  a mappings for those devices if present in the instance type. We
  should create them from the API layer, before validating the block
  device mappings and only if no swap or ephemeral device are defined by
  the user.

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