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OS : CentOS 7 Gnome Desktop问题描述：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 可以查看到kvm-intel模块已经加入至内核中。使用命令行工具virsh[root@localhost qemu]# virsh define CCnode.xmlerror: failed to connect to the hypervisorerror: no valid connectionerror: no connection driver available for <null>error: Failed to reconnect to the hypervisor重启libvirtd服务，查看日志记录/var/log/messagesAug 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 referenceAug 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: virStorageFileCreateAug 10 11:15:57 localhost journal: Module /usr/lib64/libvirt/connection-driver/libvirt_driver_lxc.so not accessibleAug 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 referenceAug 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，解决此问题只需更新软件包查看包版本：yum info device-mapper-libs更新软件包：yum update device-mapper-libs
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