在RHEL7.0上安装virt-manager后遇到无法连接libvirt的错误。通过检查libvirtd服务状态，发现可能由驱动问题引起。更新device-mapper包，重启libvirtd服务后，问题得到解决，virt-manager能正常连接。
RHEL7.0在安装完成virt-manager后，启动libvirtd服务进程
[root@demo Desktop]# systemctl enable libvirtd [root@demo Desktop]# systemctl start libvirtd
在使用virt-manager命令启动虚拟机管理软件时，提示unable to connect to libvirt
Unable to connect to libvirt.
no connection driver available for qemu:///system
Libvirt URI is: qemu:///system
Traceback (most recent call last):
File "/usr/share/virt-manager/virtManager/connection.py", line 969, in _open_thread
self._backend.open(self._do_creds_password)
File "/usr/share/virt-manager/virtinst/connection.py", line 157, in open
open_flags)
File "/usr/lib64/python2.7/site-packages/libvirt.py", line 105, in openAuth
if ret is None:raise libvirtError('virConnectOpenAuth() failed')
libvirtError: no connection
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