OS : CentOS 7 Gnome Desktop
问题描写叙述：
CentOS 7 下使用yum install virt-manager之后。使用virt-manager无法连接本地的hypervisor。
使用lsmod 能够查看到kvm-intel模块已经增加至内核中。
使用命令行工具virsh
[root@localhost qemu]# virsh define CCnode.xml
error: failed to connect to the hypervisor
error: no valid connection
error: no connection driver available for <null>
error: Failed to reconnect to the hypervisor
重新启动libvirtd服务，查看日志记录/var/log/messages
Aug 10 11:15:57 localhost systemd: Starting Virtualization daemon...
Aug 10 11:15:57 localhost journal: libvirt version: 1.2.8, package: 16.el7_1.3 (CentOS BuildSystem <http://bugs.centos.org>, 2015-05-12-20:12:58, worker1.bsys.centos.org)
Aug 10 11:15:57 localhost journal: failed to load module /usr/lib64/libvirt/connection-driver/libvirt_driver_storage.so /usr/lib64/libvirt/connection-driver/libvirt_driver_storage.so: symbol dm_task_get_info_with_deferred_remove, version Base not defined in file libdevmapper.so.1.02 with link time reference
Aug 10 11:15:57 localhost journal: failed to load module /usr/lib64/libvirt/connection-driver/libvirt_driver_qemu.so /usr/lib64/libvirt/connection-driver/libvirt_driver_qemu.so: undefined symbol: virStorageFileCreate
Aug 10 11:15:57 localhost journal: Module /usr/lib64/libvirt/connection-driver/libvirt_driver_lxc.so not accessible
Aug 10 11:15:57 localhost systemd: Started Virtualization daemon.
日志记录错误关键部分：
journal: failed to load module /usr/lib64/libvirt/connection-driver/libvirt_driver_storage.so /usr/lib64/libvirt/connection-driver/libvirt_driver_storage.so: symbol dm_task_get_info_with_deferred_remove, version Base not defined in file libdevmapper.so.1.02 with link time reference
Aug 10 11:15:57 localhost journal: failed to load module /usr/lib64/libvirt/connection-driver/libvirt_driver_qemu.so /usr/lib64/libvirt/connection-driver/libvirt_driver_qemu.so: undefined symbol: virStorageFileCreate
经过Google。解决此问题仅仅需更新软件包
查看包版本号：
yum info device-mapper-libs
更新软件包：
yum update device-mapper-libs
參考：
http://blog.163.com/liyinhu_86/blog/static/4177704420153254114521/
https://bugzilla.redhat.com/show_bug.cgi?id=1164773
https://bugzilla.redhat.com/show_bug.cgi?id=842068