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[Sun Mengyun <1799340@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Description
===========
I deploy a vm with flavor:
+----------+-----------+------+-----------+------+-------+-------------+---------
| Name     | Memory_MB | Disk | Ephemeral | Swap | VCPUs | RXTX_Factor | 
+----------+-----------+------+-----------+------+-------+-------------+-----------+-------------+
| smy_test | 512       | 10   | 5         | 1    | 2     | 1.0         | True      | -           |
+----------+-----------+------+-----------+------+-------+-------------+---------

When the VM is deployed successfully and running normally,the default_ephemeral_device is not updated in instances table in database. Obviously default_swap_device and root_device_name is updated.
+------------------+--------------------------+---------------------+
| root_device_name | default_ephemeral_device | default_swap_device |
+------------------+--------------------------+---------------------+
| /dev/vda         | NULL                     | /dev/vdc            |
+------------------+--------------------------+---------------------+

Steps to reproduce
==================
1. create a flavor using ephemeral
2. deploy a VM with this flavor

Expected result
===============
check instances table and default_ephemeral_device is NULL;

Actual result
=============
default_ephemeral_device  has a value;

Environment
===========
[root@nail1 ~]# rpm -qa | grep nova
openstack-nova-api-18.0.2-1.el7.noarch
openstack-nova-common-18.0.2-1.el7.noarch
python2-novaclient-11.0.0-1.el7.noarch
openstack-nova-placement-api-18.0.2-1.el7.noarch
openstack-nova-scheduler-18.0.2-1.el7.noarch
openstack-nova-conductor-18.0.2-1.el7.noarch
openstack-nova-novncproxy-18.0.2-1.el7.noarch
python-nova-18.0.2-1.el7.noarch
openstack-nova-compute-18.0.2-1.el7.noarch
openstack-nova-console-18.0.2-1.el7.noarch

hypervisor:
Libvirt + KVM

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1799340

Title:
  The default_ephemeral_device in instances table  is  NULL  when
  deploying a VM

Status in OpenStack Compute (nova):
  New

Bug description:
  Description
  ===========
  I deploy a vm with flavor:
  +----------+-----------+------+-----------+------+-------+-------------+---------
  | Name     | Memory_MB | Disk | Ephemeral | Swap | VCPUs | RXTX_Factor | 
  +----------+-----------+------+-----------+------+-------+-------------+-----------+-------------+
  | smy_test | 512       | 10   | 5         | 1    | 2     | 1.0         | True      | -           |
  +----------+-----------+------+-----------+------+-------+-------------+---------

  When the VM is deployed successfully and running normally,the default_ephemeral_device is not updated in instances table in database. Obviously default_swap_device and root_device_name is updated.
  +------------------+--------------------------+---------------------+
  | root_device_name | default_ephemeral_device | default_swap_device |
  +------------------+--------------------------+---------------------+
  | /dev/vda         | NULL                     | /dev/vdc            |
  +------------------+--------------------------+---------------------+

  Steps to reproduce
  ==================
  1. create a flavor using ephemeral
  2. deploy a VM with this flavor

  Expected result
  ===============
  check instances table and default_ephemeral_device is NULL;

  Actual result
  =============
  default_ephemeral_device  has a value;

  Environment
  ===========
  [root@nail1 ~]# rpm -qa | grep nova
  openstack-nova-api-18.0.2-1.el7.noarch
  openstack-nova-common-18.0.2-1.el7.noarch
  python2-novaclient-11.0.0-1.el7.noarch
  openstack-nova-placement-api-18.0.2-1.el7.noarch
  openstack-nova-scheduler-18.0.2-1.el7.noarch
  openstack-nova-conductor-18.0.2-1.el7.noarch
  openstack-nova-novncproxy-18.0.2-1.el7.noarch
  python-nova-18.0.2-1.el7.noarch
  openstack-nova-compute-18.0.2-1.el7.noarch
  openstack-nova-console-18.0.2-1.el7.noarch

  hypervisor:
  Libvirt + KVM

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