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[Alex Xu <soulxu@xxxxxxxxx>]

Public bug reported:

The instance hostname is convert from instance's name. There is method
used to do that
https://github.com/openstack/nova/blob/master/nova/utils.py#L774

But looks like this method didn't match all the cases described in the
RFC

For example, if the host name just one character, like 'A', this method
return 'A‘ also, this isn't allowed by RFC.

And the hostname was updated at wrong place: https://github.com/openstack/nova/blob/master/nova/compute/api.py#L641
It just update the instance db entry again after instance entry creation. We can populate the hostname before instance creation, then we can save one db operation.

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1495388

Title:
  The instance hostname didn't match the RFC 952 and 1123's definition

Status in OpenStack Compute (nova):
  New

Bug description:
  The instance hostname is convert from instance's name. There is method
  used to do that
  https://github.com/openstack/nova/blob/master/nova/utils.py#L774

  But looks like this method didn't match all the cases described in the
  RFC

  For example, if the host name just one character, like 'A', this
  method return 'A‘ also, this isn't allowed by RFC.

  And the hostname was updated at wrong place: https://github.com/openstack/nova/blob/master/nova/compute/api.py#L641
  It just update the instance db entry again after instance entry creation. We can populate the hostname before instance creation, then we can save one db operation.

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