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[wang <1880671@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Nova failed to create an instance.

Description
===========
Nova failed to create an instance, prompting 'No valid host was found.'

nova-compute.log
===========
ERROR nova.virt.disk.mount.nbd [-] nbd module not loaded 

INFO nova.virt.disk.mount.api [-] Device allocation failed. Will retry
in 2 seconds.

WARNING nova.virt.disk.mount.api [-] Device allocation failed after
repeated retries.

INFO nova.virt.libvirt.driver [-] [instance: c049210a-116f-
49dc-a290-103ba4f97845] Using config drive

INFO nova.virt.libvirt.driver [-] [instance: c049210a-116f-
49dc-a290-103ba4f97845] Creating config drive at /var/lib/nova/instances
/c049210a-116f-49dc-a290-103ba4f97845/disk.config

ERROR nova.compute.manager [-] [instance: c049210a-116f-
49dc-a290-103ba4f97845] Instance failed to spawn

** Affects: nova
     Importance: Undecided
         Status: Incomplete

-- 
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https://bugs.launchpad.net/bugs/1880671

Title:
  Nova failed to create an instance.

Status in OpenStack Compute (nova):
  Incomplete

Bug description:
  Nova failed to create an instance.

  Description
  ===========
  Nova failed to create an instance, prompting 'No valid host was found.'

  nova-compute.log
  ===========
  ERROR nova.virt.disk.mount.nbd [-] nbd module not loaded 

  INFO nova.virt.disk.mount.api [-] Device allocation failed. Will retry
  in 2 seconds.

  WARNING nova.virt.disk.mount.api [-] Device allocation failed after
  repeated retries.

  INFO nova.virt.libvirt.driver [-] [instance: c049210a-116f-
  49dc-a290-103ba4f97845] Using config drive

  INFO nova.virt.libvirt.driver [-] [instance: c049210a-116f-
  49dc-a290-103ba4f97845] Creating config drive at
  /var/lib/nova/instances/c049210a-116f-
  49dc-a290-103ba4f97845/disk.config

  ERROR nova.compute.manager [-] [instance: c049210a-116f-
  49dc-a290-103ba4f97845] Instance failed to spawn

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