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[hulina <1834463@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Description
===========
We spawn VM with port-id ,the value of preserve_on_delete is True ,When we lose some ports from instance_info_caches ,after periodic task _heal_instance_info_cache the instance_info_caches are recovery from neutron, however the value of preserve_on_delete became False,not the original value False    

Steps to reproduce
==================
1.Spawn VM with command :nova boot --flavor xx --nic port-id xx --image xx instance_name
2.nova interface-list instance_name(Preserve On Delete is True)
3.Update nova db row, drop one interface from interfaces,such as
Update instance_info_caches set network_info='[]' where instance_uuid='xxx';
4.nova show instance_name (we can see ,vm lost network info )
5.after periodic task _heal_instance_info_cache , interface is added to the instance 
6.nova interface-list instance_name   (Preserve On Delete became False ,not the original value)

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1834463

Title:
  Value of perserve_on_delete not corrte after _heal_instance_info_cache

Status in OpenStack Compute (nova):
  New

Bug description:
  Description
  ===========
  We spawn VM with port-id ,the value of preserve_on_delete is True ,When we lose some ports from instance_info_caches ,after periodic task _heal_instance_info_cache the instance_info_caches are recovery from neutron, however the value of preserve_on_delete became False,not the original value False    

  Steps to reproduce
  ==================
  1.Spawn VM with command :nova boot --flavor xx --nic port-id xx --image xx instance_name
  2.nova interface-list instance_name(Preserve On Delete is True)
  3.Update nova db row, drop one interface from interfaces,such as
  Update instance_info_caches set network_info='[]' where instance_uuid='xxx';
  4.nova show instance_name (we can see ,vm lost network info )
  5.after periodic task _heal_instance_info_cache , interface is added to the instance 
  6.nova interface-list instance_name   (Preserve On Delete became False ,not the original value)

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