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这篇文章主要介绍 Newton 版 Openstack 创建云主机失败怎么办，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
1. 错误背景
安装了 N 版 Openstack Ha，在创建云主机时源选择镜像并创建新卷时，云主机创建失败。检查发现，卷其实创建成功了并且可用，可以通过创建的卷启动云主机。使用 cirros 测试镜像，不会出现问题，使用 CentOS7.3 会出现这种报错，不仅同时创建 2 个，就连一次只创建一个也会报错。
2. 检查日志
2017-06-06 09:30:28.513 665097 WARNING nova.virt.block_device [req-c5016b48-399b-44f8-adea-a86421f1e129 c49d86f8a39148bb809d2da44811ca3b f19126d9035d4209b363386e8e267129 - - -] Failed to delete volume: dd04f3d2-63cb-45f2-9a31-9ecc523bd4
0f due to Invalid input received: Invalid volume: Volume status must be available or error or error_restoring or error_extending and must not be migrating, attached, belong to a group or have snapshots. (HTTP 400) (Request-ID: req-0bd8e
4b4-6989-4c34-a623-20d2bff98816)
2017-06-06 09:30:28.514 665097 ERROR nova.compute.manager [req-c5016b48-399b-44f8-adea-a86421f1e129 c49d86f8a39148bb809d2da44811ca3b f19126d9035d4209b363386e8e267129 - - -] [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] Instance faile
d block device setup
2017-06-06 09:30:28.514 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] Traceback (most recent call last):
2017-06-06 09:30:28.514 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] File /usr/lib/python2.7/site-packages/nova/compute/manager.py , line 1586, in _prep_block_device
2017-06-06 09:30:28.514 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] wait_func=self._await_block_device_map_created)
2017-06-06 09:30:28.514 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] File /usr/lib/python2.7/site-packages/nova/virt/block_device.py , line 514, in attach_block_devices
2017-06-06 09:30:28.514 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] map(_log_and_attach, block_device_mapping)
2017-06-06 09:30:28.514 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] File /usr/lib/python2.7/site-packages/nova/virt/block_device.py , line 512, in _log_and_attach
2017-06-06 09:30:28.514 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] bdm.attach(*attach_args, **attach_kwargs)
2017-06-06 09:30:28.514 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] File /usr/lib/python2.7/site-packages/nova/virt/block_device.py , line 404, in attach
2017-06-06 09:30:28.514 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] self._call_wait_func(context, wait_func, volume_api, vol[ id])
2017-06-06 09:30:28.514 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] File /usr/lib/python2.7/site-packages/nova/virt/block_device.py , line 363, in _call_wait_func
2017-06-06 09:30:28.514 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] {volume_id : volume_id, exc : exc})
2017-06-06 09:30:28.514 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] File /usr/lib/python2.7/site-packages/oslo_utils/excutils.py , line 220, in __exit__
2017-06-06 09:30:28.514 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] self.force_reraise()
2017-06-06 09:30:28.514 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] File /usr/lib/python2.7/site-packages/oslo_utils/excutils.py , line 196, in force_reraise
2017-06-06 09:30:28.514 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] six.reraise(self.type_, self.value, self.tb)
2017-06-06 09:30:28.514 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] File /usr/lib/python2.7/site-packages/nova/virt/block_device.py , line 353, in _call_wait_func
2017-06-06 09:30:28.514 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] wait_func(context, volume_id)
2017-06-06 09:30:28.514 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] File /usr/lib/python2.7/site-packages/nova/compute/manager.py , line 1258, in _await_block_device_map_created
2017-06-06 09:30:28.514 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] volume_status=volume_status)
2017-06-06 09:30:28.514 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] VolumeNotCreated: Volume dd04f3d2-63cb-45f2-9a31-9ecc523bd40f did not finish being created even after we waited 189 seconds or 61
attempts. And its status is downloading.
2017-06-06 09:30:28.514 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94]
2017-06-06 09:30:28.638 665097 WARNING nova.scheduler.client.report [req-c5016b48-399b-44f8-adea-a86421f1e129 c49d86f8a39148bb809d2da44811ca3b f19126d9035d4209b363386e8e267129 - - -] No authentication information found for placement API
. Placement is optional in Newton, but required in Ocata. Please enable the placement service before upgrading.
2017-06-06 09:30:28.638 665097 WARNING nova.scheduler.client.report [req-c5016b48-399b-44f8-adea-a86421f1e129 c49d86f8a39148bb809d2da44811ca3b f19126d9035d4209b363386e8e267129 - - -] Unable to refresh my resource provider record
2017-06-06 09:30:28.639 665097 ERROR nova.compute.manager [req-c5016b48-399b-44f8-adea-a86421f1e129 c49d86f8a39148bb809d2da44811ca3b f19126d9035d4209b363386e8e267129 - - -] [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] Build of insta
nce 30e8a024-d1c0-4a64-aae7-a830e8c6be94 aborted: Block Device Mapping is Invalid.
2017-06-06 09:30:28.639 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] Traceback (most recent call last):
2017-06-06 09:30:28.639 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] File /usr/lib/python2.7/site-packages/nova/compute/manager.py , line 1783, in _do_build_and_run_instance
2017-06-06 09:30:28.639 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] filter_properties)
2017-06-06 09:30:28.639 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] File /usr/lib/python2.7/site-packages/nova/compute/manager.py , line 1943, in _build_and_run_instance
2017-06-06 09:30:28.639 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] create.error , fault=e)
2017-06-06 09:30:28.639 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] File /usr/lib/python2.7/site-packages/oslo_utils/excutils.py , line 220, in __exit__
2017-06-06 09:30:28.639 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] self.force_reraise()
2017-06-06 09:30:28.639 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] File /usr/lib/python2.7/site-packages/oslo_utils/excutils.py , line 196, in force_reraise
2017-06-06 09:30:28.639 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] six.reraise(self.type_, self.value, self.tb)
2017-06-06 09:30:28.639 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] File /usr/lib/python2.7/site-packages/nova/compute/manager.py , line 1908, in _build_and_run_instance
2017-06-06 09:30:28.639 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] block_device_mapping) as resources:
2017-06-06 09:30:28.639 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] File /usr/lib64/python2.7/contextlib.py , line 17, in __enter__
2017-06-06 09:30:28.639 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] return self.gen.next()
2017-06-06 09:30:28.639 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] File /usr/lib/python2.7/site-packages/nova/compute/manager.py , line 2071, in _build_resources
2017-06-06 09:30:28.639 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] reason=e.format_message())
2017-06-06 09:30:28.639 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] BuildAbortException: Build of instance 30e8a024-d1c0-4a64-aae7-a830e8c6be94 aborted: Block Device Mapping is Invalid.
2017-06-06 09:30:28.639 665097 ERROR nova.compute.manager [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94]
2017-06-06 09:30:29.364 665097 INFO nova.compute.manager [req-c5016b48-399b-44f8-adea-a86421f1e129 c49d86f8a39148bb809d2da44811ca3b f19126d9035d4209b363386e8e267129 - - -] [instance: 30e8a024-d1c0-4a64-aae7-a830e8c6be94] Took 0.72 secon
ds to deallocate network for instance.3. 错误分析：
底层存储 Ceph 创建新卷的时候速度太慢，导致 nova 连接卷超时或者超出连接次数 两个解决办法：一个是提高 ceph 读写速度（增加 ssd 作为 journal），条件不允许, 此方法作罢。另一个是寻找是否有相关参数设定连接时间或者连接次数。
4. 源码查看
错误信息中看到了_await_block_device_map_created 找到了对应的函数
def _await_block_device_map_created(self, context, vol_id):
# TODO(yamahata): creating volume simultaneously
# reduces creation time?
# TODO(yamahata): eliminate dumb polling
start = time.time()
retries = CONF.block_device_allocate_retries
if retries 0:
LOG.warning(_LW( Treating negative config value (%(retries)s) for
block_device_retries as 0. ),
{retries : retries})
# (1) treat negative config value as 0
# (2) the configured value is 0, one attempt should be made
# (3) the configured value is 0, then the total number attempts
# is (retries + 1)
attempts = 1
if retries = 1:
attempts = retries + 1
for attempt in range(1, attempts + 1):
volume = self.volume_api.get(context, vol_id)
volume_status = volume[status]
if volume_status not in [creating , downloading]:
if volume_status == available :
return attempt
LOG.warning(_LW( Volume id: %(vol_id)s finished being
created but its status is %(vol_status)s. ),
{ vol_id : vol_id,
vol_status : volume_status})
break
greenthread.sleep(CONF.block_device_allocate_retries_interval)
raise exception.VolumeNotCreated(volume_id=vol_id,
seconds=int(time.time() - start),
attempts=attempt,
volume_status=volume_status)有两个参数 block_device_allocate_retries 和 block_device_allocate_retries_interval，看名字可以知道一个是尝试次数，一个是尝试间隔
5. 解决经过
参数默认值
block_device_allocate_retries_interval=3
block_device_allocate_retries=60 先修改间隔
block_device_allocate_retries_interval=10
重启 nova-compute
systemctl restart openstack-nova-compute.service
再以同样的方式创建一台云主机，发现可以创建成功。
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