It happens even with CLI. http://paste.openstack.org/show/628012/
Looks line a nova bug.

** Changed in: horizon
    Milestone: next => None

** Changed in: horizon
     Assignee: yan tan (yetbing) => (unassigned)

** Project changed: horizon => nova

** Changed in: nova
       Status: Triaged => New

** Changed in: nova
   Importance: Wishlist => Undecided

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https://bugs.launchpad.net/bugs/1655563

Title:
  launch a instance which name include spot failed

Status in OpenStack Compute (nova):
  New

Bug description:
  can not  launch a instance which name  include spot and number like
  14.4.

  nova-conductor.log  find this error.

  2017-01-11 16:27:46.928 23 ERROR nova.scheduler.utils 
[req-ed6f17d5-ef49-412e-8e7e-703b7ed5738b eef7aab2a2bf4067a4baf27cdbe62cc6 
90e82be1b4a34c62a27d4fde986e00c2 - - -] [instance: 
46fe3b71-0c90-458c-8be6-cd9dcd8733a3] Error from last host: compute1 (node 
compute1): [u'Traceback (most recent call last):\n', u'  File 
"/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 1926, in 
_do_build_and_run_instance\n    filter_properties)\n', u'  File 
"/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 2116, in 
_build_and_run_instance\n    instance_uuid=instance.uuid, 
reason=six.text_type(e))\n', u"RescheduledException: Build of instance 
46fe3b71-0c90-458c-8be6-cd9dcd8733a3 was re-scheduled: Invalid input for 
dns_name. Reason: '14.4' not a valid PQDN or FQDN. Reason: TLD '4' must not be 
all numeric.\nNeutron server returns request_ids: 
['req-9a2fa7cb-35cd-462f-973d-5c618b72b18d']\n"]
  2017-01-11 16:27:47.113 23 WARNING nova.scheduler.utils 
[req-ed6f17d5-ef49-412e-8e7e-703b7ed5738b eef7aab2a2bf4067a4baf27cdbe62cc6 
90e82be1b4a34c62a27d4fde986e00c2 - - -] Failed to compute_task_build_instances: 
No valid host was found. There are not enough hosts available.

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