libvirt users - Oct 2012 - virsh start failed (Failed to query file context on ...)

hi all,


    I try to follow the instructions in http://libvirt.org/drvlxc.html to config
libvirt-lxc, but failed when starting the lxc.


    The domain config file:
# cat b.xml 


<domain type='lxc'>
  <name>b</name>
  <memory>32768</memory>
  <os>
    <type>exe</type>
    <init>/bin/sh</init>
  </os>
  <vcpu>1</vcpu>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>destroy</on_crash>
  <devices>
    <emulator>/usr/libexec/libvirt_lxc</emulator>
    <filesystem type='mount'>
      <source dir='/data/lxc/centos6'/>
      <target dir='/'/>
    </filesystem>
    <interface type='network'>
      <source network='default'/>
    </interface>
    <console type='pty' />
  </devices>
</domain>


then define it:
# virsh --connect lxc:/// define b.xml
Domain b defined from b.xml


then start:
# virsh --connect lxc:/// start b    
error: Failed to start domain b
error: internal error guest failed to start: 2012-10-10 09:56:17.369+0000:
452722: info : libvirt version: 0.9.10, package: 21.el6_3.4 (CentOS BuildSystem
<http://bugs.centos.org>, 2012-08-23-18:28:26, c6b9.bsys.dev.centos.org)
2012-10-10 09:56:17.369+0000: 452722: error : lxcControllerRun:1484 : Failed to
query file context on /data/lxc/centos6: No data available


It's the filesystem mount section that cause this problem. The tutorial says
the path '/data/lxc/centos6' should be "private root filesystem
(perhaps hand-crafted using busybox, or installed from media, debootstrap,
whatever)", but I am not quite clear about what this path should be. In my
case, the "/data/lxc/centos6" is the root of template downloaded from
http://wiki.openvz.org/Download/template/precreated.


# pwd
/data/lxc/centos6
# ls
bin  boot  dev  etc  fastboot  home  lib  media  mnt  opt  proc  root  sbin 
selinux  srv  sys  tmp  usr  var


Can someone elaborate what should <source
dir='/data/lxc/centos6'/> be?


many thanks
    
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