Hello > When start service libvirtd by > > service libvirtd start > > OS: CentOS 6.5 > libvirt: libvirt-daemon-1.2.5-1.mira1.x86_64 https://www.redhat.com/mailman/listinfo/libvirt-users is the official mailing list for the libvirt daemon, maybe you can ask in there and get better support. > Does anyone know the reason? This mailing list is for the general usage of the CentOS system, I am afraid that not many experts about libvert could be found here. If you ask in the most appropriate mailing list, you may get the quickest and the most helpful assistance.