no valid host was found. There are not enough hosts available.
Code
500
Details
File "/usr/lib/python2.7/dist-packages/nova/conductor/manager.py", 
line 526, in build_instances context, request_spec, filter_properties) File "/usr/lib/python2.7/dist-packages/nova/conductor/manager.py", 
line 597, in _schedule_instances hosts = self.scheduler_client.select_destinations(context, spec_obj) File "/usr/lib/python2.7/dist-packages/nova/scheduler/utils.py", 
line 371, in wrapped return func(*args, **kwargs) File "/usr/lib/python2.7/dist-packages/nova/scheduler/client/__init__.py", 
line 51, in select_destinations return self.queryclient.select_destinations(context, spec_obj) File "/usr/lib/python2.7/dist-packages/nova/scheduler/client/__init__.py", 
line 37, in __run_method return getattr(self.instance, __name)(*args, **kwargs) 
File "/usr/lib/python2.7/dist-packages/nova/scheduler/client/query.py", 
line 32, in select_destinations return self.scheduler_rpcapi.select_destinations(context, spec_obj) 
File "/usr/lib/python2.7/dist-packages/nova/scheduler/rpcapi.py", 
line 129, in select_destinations return cctxt.call(ctxt, 'select_destinations', **msg_args) 
File "/usr/lib/python2.7/dist-packages/oslo_messaging/rpc/client.py", 
line 169, in call retry=self.retry) 
File "/usr/lib/python2.7/dist-packages/oslo_messaging/transport.py", 
line 97, in _send timeout=timeout, retry=retry) 
File "/usr/lib/python2.7/dist-packages/oslo_messaging/_drivers/amqpdriver.py", 
line 458, in send retry=retry) File "/usr/lib/python2.7/dist-packages/oslo_messaging/_drivers/amqpdriver.py", 
line 449, in _send raise result

Possible reason

* if using cloud uefi image, it needs to install qemu-efi package in computer node, don’t know why it won’t install it automatically .
$ apt install qemu-efi
* when add new UEFI image, it needs to add new meta data parameter in Horization
hw_firmware_type=uefi

if see

2017-08-01 14:02:13.612 2409 ERROR nova.compute.manager [instance: b334f0b3-ca9a-4f9a-b488-532dce00265a] libvirtError: unsupported configuration: logfile not supported in this QEMU binary
2017-08-01 14:02:13.612 2409 ERROR nova.compute.manager [instance: b334f0b3-ca9a-4f9a-b488-532dce00265a]
# Use the "logd" backend for handling stdout/stderr from QEMU processes.

Reason
* Libvirt later version support new function, logd, it’s a new console log function, but ARM64 doesn’t support it. workaround solution is to disable it

Edit file /usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py, find

MIN_LIBVIRT_VIRTLOGD = (1, 3, 3)
MIN_QEMU_VIRTLOGD = (2, 7, 0)

Replaced it with

MIN_LIBVIRT_VIRTLOGD = (9, 9, 9)
MIN_QEMU_VIRTLOGD = (9, 9, 9)

it can avoid to call libvirt logd function.

rm -f /usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.pyc, make sure it will call .py
then, reboot service (or system)

Ref.
http://dozencloud.org/

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