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