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For more than a year, i have deployed  multiple clusters using 
openstack-ansible. 
This particular case is using FQDN for the internal and external endpoint.

[DEFAULT]
...

# Metadata
metadata_host = my-int.XXX.com
metadata_port = 8775
metadata_workers = 3
...


Recently, this breaks nova-console. 

2017-08-25 21:19:02.928 18130 WARNING oslo_reports.guru_meditation_report [-] 
Guru meditation now registers SIGUSR1 and SIGUSR2 by default for backward 
compatibility. SIGUSR1 will no longer be registered in a future release, so 
please use SIGUSR2 to generate reports.
2017-08-25 21:19:02.931 18130 INFO nova.network.driver [-] Loading network 
driver 'nova.network.linux_net'
2017-08-25 21:19:03.078 18130 CRITICAL nova [-] AddrFormatError: failed to 
detect a valid IP address from 'my-int.XXX.com'
2017-08-25 21:19:03.078 18130 ERROR nova Traceback (most recent call last):
2017-08-25 21:19:03.078 18130 ERROR nova   File 
"/openstack/venvs/nova-15.1.8/bin/nova-api-metadata", line 11, in <module>
2017-08-25 21:19:03.078 18130 ERROR nova     sys.exit(main())
2017-08-25 21:19:03.078 18130 ERROR nova   File 
"/openstack/venvs/nova-15.1.8/lib/python2.7/site-packages/nova/cmd/api_metadata.py",
 line 48, in main
2017-08-25 21:19:03.078 18130 ERROR nova     server = 
service.WSGIService('metadata', use_ssl=should_use_ssl)
2017-08-25 21:19:03.078 18130 ERROR nova   File 
"/openstack/venvs/nova-15.1.8/lib/python2.7/site-packages/nova/service.py", 
line 309, in __init__
2017-08-25 21:19:03.078 18130 ERROR nova     self.manager = self._get_manager()
2017-08-25 21:19:03.078 18130 ERROR nova   File 
"/openstack/venvs/nova-15.1.8/lib/python2.7/site-packages/nova/service.py", 
line 364, in _get_manager
2017-08-25 21:19:03.078 18130 ERROR nova     return manager_class()
2017-08-25 21:19:03.078 18130 ERROR nova   File 
"/openstack/venvs/nova-15.1.8/lib/python2.7/site-packages/nova/api/manager.py", 
line 30, in __init__
2017-08-25 21:19:03.078 18130 ERROR nova     
self.network_driver.metadata_accept()
2017-08-25 21:19:03.078 18130 ERROR nova   File 
"/openstack/venvs/nova-15.1.8/lib/python2.7/site-packages/nova/network/linux_net.py",
 line 599, in metadata_accept
2017-08-25 21:19:03.078 18130 ERROR nova     (CONF.metadata_port, 
_iptables_dest(CONF.metadata_host)))
2017-08-25 21:19:03.078 18130 ERROR nova   File 
"/openstack/venvs/nova-15.1.8/lib/python2.7/site-packages/nova/network/linux_net.py",
 line 588, in _iptables_dest
2017-08-25 21:19:03.078 18130 ERROR nova     if ((netaddr.IPAddress(ip).version 
== 4 and ip == '127.0.0.1')
2017-08-25 21:19:03.078 18130 ERROR nova   File 
"/openstack/venvs/nova-15.1.8/lib/python2.7/site-packages/netaddr/ip/__init__.py",
 line 306, in __init__
2017-08-25 21:19:03.078 18130 ERROR nova     'address from %r' % addr)
2017-08-25 21:19:03.078 18130 ERROR nova AddrFormatError: failed to detect a 
valid IP address from 'my-int.XXX.com'
2017-08-25 21:19:03.078 18130 ERROR nova
2017-08-25 21:19:09.833 18137 WARNING oslo_reports.guru_meditation_report [-] 
Guru meditation now registers SIGUSR1 and SIGUSR2 by default for backward 
compatibility. SIGUSR1 will no longer be registered in a future release, so 
please use SIGUSR2 to generate reports.
2017-08-25 21:19:09.836 18137 INFO nova.network.driver [-] Loading network 
driver 'nova.network.linux_net'
2017-08-25 21:19:10.040 18137 CRITICAL nova [-] AddrFormatError: failed to 
detect a valid IP address from 'my-int.XXX.com'
2017-08-25 21:19:10.040 18137 ERROR nova Traceback (most recent call last):
2017-08-25 21:19:10.040 18137 ERROR nova   File 
"/openstack/venvs/nova-15.1.8/bin/nova-api-metadata", line 11, in <module>
2017-08-25 21:19:10.040 18137 ERROR nova     sys.exit(main())
2017-08-25 21:19:10.040 18137 ERROR nova   File 
"/openstack/venvs/nova-15.1.8/lib/python2.7/site-packages/nova/cmd/api_metadata.py",
 line 48, in main
2017-08-25 21:19:10.040 18137 ERROR nova     server = 
service.WSGIService('metadata', use_ssl=should_use_ssl)
2017-08-25 21:19:10.040 18137 ERROR nova   File 
"/openstack/venvs/nova-15.1.8/lib/python2.7/site-packages/nova/service.py", 
line 309, in __init__
2017-08-25 21:19:10.040 18137 ERROR nova     self.manager = self._get_manager()
2017-08-25 21:19:10.040 18137 ERROR nova   File 
"/openstack/venvs/nova-15.1.8/lib/python2.7/site-packages/nova/service.py", 
line 364, in _get_manager
2017-08-25 21:19:10.040 18137 ERROR nova     return manager_class()
2017-08-25 21:19:10.040 18137 ERROR nova   File 
"/openstack/venvs/nova-15.1.8/lib/python2.7/site-packages/nova/api/manager.py", 
line 30, in __init__
2017-08-25 21:19:10.040 18137 ERROR nova     
self.network_driver.metadata_accept()
2017-08-25 21:19:10.040 18137 ERROR nova   File 
"/openstack/venvs/nova-15.1.8/lib/python2.7/site-packages/nova/network/linux_net.py",
 line 599, in metadata_accept
2017-08-25 21:19:10.040 18137 ERROR nova     (CONF.metadata_port, 
_iptables_dest(CONF.metadata_host)))
2017-08-25 21:19:10.040 18137 ERROR nova   File 
"/openstack/venvs/nova-15.1.8/lib/python2.7/site-packages/nova/network/linux_net.py",
 line 588, in _iptables_dest
2017-08-25 21:19:10.040 18137 ERROR nova     if ((netaddr.IPAddress(ip).version 
== 4 and ip == '127.0.0.1')
2017-08-25 21:19:10.040 18137 ERROR nova   File 
"/openstack/venvs/nova-15.1.8/lib/python2.7/site-packages/netaddr/ip/__init__.py",
 line 306, in __init__
2017-08-25 21:19:10.040 18137 ERROR nova     'address from %r' % addr)
2017-08-25 21:19:10.040 18137 ERROR nova AddrFormatError: failed to detect a 
valid IP address from 'my-int.XXX.com'
2017-08-25 21:19:10.040 18137 ERROR nova 


Changing hostname to IP address fixes it.

# Metadata
metadata_host = 172.16.236.2 
metadata_port = 8775
metadata_workers = 3
...


Is this a bug? or a new change? or should we now should not use FQDN in host ? 


Thanks,
Shashi

** Affects: nova
     Importance: Undecided
         Status: New

-- 
nova metadata service breaks on hostname
https://bugs.launchpad.net/bugs/1713144
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