kvm 启动libvirtd市出现错误：
/etc/init.d/libvirtd start
启动 libvirtd 守护进程：libvirtd: relocation error: libvirtd: symbol dm_task_get_info_with_deferred_remove, version Base not defined in file libdevmapper.so.1.02 with link time reference
启动守护程序报错，解决方法：
yum upgrade device-mapper-libs