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Re: [libvirt] Issues with qemu-nbd over AF_UNIX and virDomainAttachDevice



On 05/25/2013 02:04 AM, Paolo Bonzini wrote:
Il 24/05/2013 10:01, Deepak C Shetty ha scritto:
Il 24/05/2013 06:59, Deepak C Shetty ha scritto:
What version of libvirt is this?  It should work starting from 1.0.4.
Ah, thats what I seem to have missed. I was using the distro provided
libvirt.. which seems to be old (0.9)!
I will compile latest libvirt and try.

I still have a Q.. for qemu-nbd exporting over Unix socket.. what should
i put for port attr of <host> tag ?
I am assuming its ignored for Unix sockets ?
It's not required anymore.  In fact it was a bug that transport='unix'
was accepted in the old libvirt, because it didn't know how to process it.

Paolo

I tried with the latest git version of libvirt (1.0.5). I still get the same error for trying to attach nbd device, where as file based device works.

./daemon/libvirtd --version
/home/dpkshetty/work/newlibvirt2/libvirt/daemon/.libs/lt-libvirtd (libvirt) 1.0.5

My qemu-nbd exports the disk as...
qemu-nbd -t -k /tmp/mysock2 /home/dpkshetty/work/img/iscsi_disk


1) My libvirtd started as
./run ./daemon/libvirtd

and in this console i see...

error : qemuMonitorTextAddDrive:2691 : operation failed: open disk image file failed

2) My python example ( I tried with virsh (started as ./run ./tools/virsh...) - see same error)

>>> print filexml
<disk type='file' device='disk'>
  <driver name="qemu" type="qcow2"/>
  <source file='/home/dpkshetty/work/img/iscsi_disk'>
  </source>
  <target dev="vdc" bus="virtio" />
</disk>
>>> dom.attachDevice(filexml)
0
>>> help(dom)

>>> dom.detachDevice(filexml)
0
>>> nbdxml='''<disk type='network'>\n <driver name="qemu" type="qcow2"/>\n <source protocol="nbd">\n <host name="deepakcs-lx" port="1111" transport="unix" socket="/tmp/mysock2" />\n </source>\n <target dev="vdc" bus="virtio" />\n</disk>'''
>>> print nbdxml
<disk type='network'>
  <driver name="qemu" type="qcow2"/>
  <source protocol="nbd">
<host name="deepakcs-lx" port="1111" transport="unix" socket="/tmp/mysock2" />
  </source>
  <target dev="vdc" bus="virtio" />
</disk>
>>> dom.attachDevice(nbdxml)
libvirt: QEMU Driver error : operation failed: open disk image file failed
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
File "/home/dpkshetty/work/newlibvirt2/libvirt/python/libvirt.py", line 419, in attachDevice if ret == -1: raise libvirtError ('virDomainAttachDevice() failed', dom=self)
libvirt.libvirtError: operation failed: open disk image file failed

3) In nbdxml, i tried removing port="1111".. it didn't give any error with regards to port beign mandatory.. which si good.. but the attach device still gives the same error as above

Is the `nbdxml` I am using for attachign a qemu-nbd exported drive, correct ?

thanx,
deepak







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