nova-compute strart 上的錯誤 - libvirt：無法將套接字連接到“/var/run/libvirt/libvirt-sock”：沒有這樣的文件或目錄

任何啟動 nova 計算服務的嘗試都失敗並出現錯誤HypervisorUnavailable: Connection to the hypervisor is broken on host:

跟踪日誌如下（取自/var/log/nova/nova-compute.log ）

AUDIT nova.service [-] Starting compute node (version 2014.1.1)
ERROR nova.virt.libvirt.driver [-] Connection to libvirt failed: Failed to connect socket to '/var/run/libvirt/libvirt-sock': No such file or directory
TRACE nova.virt.libvirt.driver Traceback (most recent call last):
TRACE nova.virt.libvirt.driver   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 787, in _connect
TRACE nova.virt.libvirt.driver     libvirt.openAuth, uri, auth, flags)
TRACE nova.virt.libvirt.driver   File "/usr/lib/python2.7/dist-packages/eventlet/tpool.py", line 139, in proxy_call
TRACE nova.virt.libvirt.driver     rv = execute(f,*args,**kwargs)
TRACE nova.virt.libvirt.driver   File "/usr/lib/python2.7/dist-packages/eventlet/tpool.py", line 77, in tworker
TRACE nova.virt.libvirt.driver     rv = meth(*args,**kwargs)
TRACE nova.virt.libvirt.driver   File "/usr/lib/python2.7/dist-packages/libvirt.py", line 105, in openAuth
TRACE nova.virt.libvirt.driver     if ret is None:raise libvirtError('virConnectOpenAuth() failed')
TRACE nova.virt.libvirt.driver libvirtError: Failed to connect socket to '/var/run/libvirt/libvirt-sock': No such file or directory
TRACE nova.virt.libvirt.driver
ERROR nova.openstack.common.threadgroup [-] Connection to the hypervisor is broken on host: <HOST_NAME>
TRACE nova.openstack.common.threadgroup Traceback (most recent call last):
TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/threadgroup.py", line 117, in wait
TRACE nova.openstack.common.threadgroup     x.wait()
TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/threadgroup.py", line 49, in wait
TRACE nova.openstack.common.threadgroup     return self.thread.wait()
TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/dist-packages/eventlet/greenthread.py", line 168, in wait
TRACE nova.openstack.common.threadgroup     return self._exit_event.wait()
TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/dist-packages/eventlet/event.py", line 116, in wait
TRACE nova.openstack.common.threadgroup     return hubs.get_hub().switch()
TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/dist-packages/eventlet/hubs/hub.py", line 187, in switch
TRACE nova.openstack.common.threadgroup     return self.greenlet.switch()
TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/dist-packages/eventlet/greenthread.py", line 194, in main
TRACE nova.openstack.common.threadgroup     result = function(*args, **kwargs)
TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/service.py", line 483, in run_service
TRACE nova.openstack.common.threadgroup     service.start()
TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/dist-packages/nova/service.py", line 163, in start
TRACE nova.openstack.common.threadgroup     self.manager.init_host()
TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 1006, in init_host
TRACE nova.openstack.common.threadgroup     self.driver.init_host(host=self.host)
TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 656, in init_host
TRACE nova.openstack.common.threadgroup     self._do_quality_warnings()
TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 639, in _do_quality_warnings
TRACE nova.openstack.common.threadgroup     caps = self.get_host_capabilities()
TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 2849, in get_host_capabilities
TRACE nova.openstack.common.threadgroup     xmlstr = self._conn.getCapabilities()
TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 721, in _get_connection
TRACE nova.openstack.common.threadgroup     wrapped_conn = self._get_new_connection()
TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 674, in _get_new_connection
TRACE nova.openstack.common.threadgroup     wrapped_conn = self._connect(self.uri(), self.read_only)
TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 796, in _connect
TRACE nova.openstack.common.threadgroup     raise exception.HypervisorUnavailable(host=CONF.host)
TRACE nova.openstack.common.threadgroup HypervisorUnavailable: Connection to the hypervisor is broken on host: <HOST_NAME>

沒有其他日誌文件指示任何錯誤 syslog，dmesg也 /var/log/libvirt/libvirtd.log沒有顯示任何問題

libvirt 配置 ( /etc/libvirt/libvirtd.conf) 設置為記錄錯誤 log_outputs="3:syslog:libvirtd"

在出現錯誤之前，節點執行平穩，沒有進行任何更改。

似乎這是libvirt. 簡而言之，問題在於它libvirtd不是以--listenflag 開頭，因此它沒有創建 nova 服務正在搜尋的適當的 sock 文件。

有關如何在“偵聽”模式下配置 libvirt 的問題，請參閱我的相關答案。

就我而言，我已經重新安裝了 libvirt 和相關的軟體包而沒有重新啟動libvirtd. 因此，使用以下三個命令解決了該錯誤：

systemctl stop libvirtd
systemctl start libvirtd
systemctl status libvirtd

引用自：https://serverfault.com/questions/677542