在 RHEL-5.8 安装 XEN 时报错如下：

ERROR    POST操作失败: xend_post：来自 xen 守护进程的错误：(xend.err \'Device 0 (vif) could not be connected. Hotplug scripts not working.\')
域安装似乎没有成功。
如果是这样，您可以运行 \'virsh start vm02\' 
重启您的域，否则请重
新开始安装。
ERROR    POST操作失败: xend_post：来自 xen 守护进程的错误：(xend.err \'Device 0 (vif) could not be connected. Hotplug scripts not working.\')
Traceback (most recent call last):
  File "/usr/sbin/virt-install", line 895, in ?
    main()
  File "/usr/sbin/virt-install", line 757, in main
    start_time, guest.start_install)
  File "/usr/sbin/virt-install", line 819, in do_install
    dom = install_func(conscb, progresscb, wait=(not wait))
  File "/usr/lib/python2.4/site-packages/virtinst/Guest.py", line 541, in start_install
    return self._do_install(consolecb, meter, removeOld, wait)
  File "/usr/lib/python2.4/site-packages/virtinst/Guest.py", line 633, in _do_install
    self.domain = self.conn.createLinux(install_xml, 0)
  File "/usr/lib/python2.4/site-packages/libvirt.py", line 1277, in createLinux
    if ret is None:raise libvirtError(\'virDomainCreateLinux() failed\', conn=self)
libvirtError: POST操作失败: xend_post：来自 xen 守护进程的错误：(xend.err \'Device 0 (vif) could not be connected. Hotplug scripts not working.\')

     到 /var/log/xen/xend.log 查阅、发现：

     DEBUG (blkif:27) exception looking up device number for xvda: [Errno 2] No such file or directory: \'/dev/xvda\'

     解决方法如下：

     mknod /dev/xvda b 220 0