xen错误
failed to connect socket to '/var/run/libvirt/libvirt-sock' 权限不够1.查看文件权限
ll /var/run/libvirt/libvirt-sock
srwxrwx--- 1 root libvirtd 0 6月 21 22:01 /var/run/libvirt/libvirt-sock=
2.添加到组
sudo adduser $USER libvirtd
3.第二步没效果的话则修改配置文件
vi /etc/libvirt/libvirt.conf
添加：unix_sock_rw_perms = 0777
所有用户生效
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