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



Il 24/05/2013 06:59, Deepak C Shetty ha scritto:
> Hi List,
>     Facing issues trying to use virDomainAttachDevice API of libvirt
> from python.
> 
> Here is what I am trying to do
> 
> 1) Setup qemu-nbd to export a qcow2 disk image over unix socket on my
> localhost
> qemu-nbd -t -k /tmp/mysock2 /home/dpkshetty/work/img/iscsi_disk
> 
> The above blocks. and i am able to use
> qemu-system-x86_64 -drive file=nbd:unix:/tmp/mysock2
> 
> Just to test it...and it works. Since currently the disk is a blank
> disk.. I see "No bootable device" and QEMU stops.. whcih is expected
> So qemu-nbd is setup and working properly
> 
> 2)
>>>> print nbdxml
> <disk type='network' device='disk'>
>   <driver name="qemu" type="qcow2"/>
>   <source protocol="nbd">
>     <host name="deepakcs-lx" port="10809" transport="unix"
> socket="/tmp/mysock2" />
>   </source>
>   <target dev="vdc" bus="virtio" />
> </disk>
>>>> dom.attachDevice(nbdxml)
> libvir: QEMU error : operation failed: open disk image file failed
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "/usr/lib64/python2.7/site-packages/libvirt.py", line 400, in
> attachDevice
>     if ret == -1: raise libvirtError ('virDomainAttachDevice() failed',
> dom=self)
> libvirt.libvirtError: operation failed: open disk image file failed
> 
> and I see... in the VM's log....
> 
> inet_connect_opts:
> connect(ipv4,deepakcs-lx.local.lan,192.168.1.7,10809): Connection refused

What version of libvirt is this?  It should work starting from 1.0.4.

Paolo


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