[Bug 1310340] Re: live migration fails when use long hostname of a nova compute target host

[Maciej Szankin]

First thing - title is confusing. Problem is not in hostname length that
is provided as target in live-migration command. Maximum hostname length
is 64, and verified, it works.

Second thing - providing FQDN (which usually is used for hypervisor
hostname) in live migration does not work by design. I am not sure if
anyone is interested in being able to give FQDNs instead of hostnames as
targets of LM.

Despite above:
There was a small possibility that by changing rabbit host in nova.conf from IP to FQDN this would be fixed, but verified it, didn't work.

I think that item is invalid, but someone has to agree with me.

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https://bugs.launchpad.net/bugs/1310340

Title:
  live migration fails when use long hostname of a nova compute target
  host

Status in OpenStack Compute (nova):
  Confirmed
Status in nova package in Ubuntu:
  Triaged

Bug description:
  Nova don't do live-migration when used long hostname of target host

  nova show ubuntu14.04
  +--------------------------------------+-----------------------------------------------------------+
  | Property                             | Value                                                     |
  +--------------------------------------+-----------------------------------------------------------+
  ..................................................................................................................................
  | OS-EXT-SRV-ATTR:host                 |     compute2                                                |
  | OS-EXT-SRV-ATTR:hypervisor_hostname  |      compute2.site.local                                     |
  ..................................................................................................................................

  nova live-migration ubuntu14.04  compute2.site.local
  ERROR (BadRequest): Compute service of  compute2.site.local is unavailable at this time. (HTTP 400) (Request-ID: req-f344c0bf-aaa3-47e6-a24c-8f37e89858e4)

  but 
  nova live-migration ubuntu14.04  compute2
  runs without error 

  
  Also if you try to do migration through horizon it always fails because horizon use long hostname fo target host.

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