[libvirt] problem attaching/detaching disk

[Shi Jin]

>
> It seems that your qemu does not support monitor command 'drive_add'.
> What's version of your qemu?
>
> Thank you. Here is my version
[cloudadmin at test2 ~]$ /usr/libexec/qemu-kvm -version
QEMU PC emulator version 0.12.1 (qemu-kvm-0.12.1.2), Copyright (c) 2003-2008
Fabrice Bellard

I finally think it is a permission issue. If I run commands as root and get
kvm run by the default qemu user, both attach-disk and detach-disk works
like your case.

However, if I set to run as another user, such as cloudamin, attach-disk
works but detach-disk does not.
My libvirtd.conf has
unix_sock_group = "cloudadmin"
unix_sock_rw_perms = "0770"
auth_unix_ro = "none"
auth_unix_rw = "none"
log_level = 3
log_outputs="3:file:/var/log/libvirt/libvirtd.log"

and qemu.conf has
user = "cloudadmin"
group = "cloudadmin"
dynamic_ownership = 0

All images are owned by the cloudadmin:cloudadmin.

Is there a problem with this setup?

Thank you very much.
Shi

> > 15:31:52.902: debug : virEventRunOnce:595 : Poll got 1 event
> > 15:31:52.902: debug : virEventDispatchTimeouts:405 : Dispatch 3
> > 15:31:52.902: debug : qemuMonitorAddDevice:1878 : mon=0x7f3628341370
> >
> device=virtio-blk-pci,bus=pci.0,addr=0x6,drive=drive-virtio-disk1,id=virtio-disk1
>
> When 'drive_add' failes, we do not call qemuMonitorAddDevice(). But it is
> called.
>
> > 15:31:52.902: debug : virEventDispatchHandles:450 : Dispatch 8
> > 15:31:52.902: debug : qemuMonitorCommandWithHandler:230 : Send command
> > 'device_add
> >
> virtio-blk-pci,bus=pci.0,addr=0x6,drive=drive-virtio-disk1,id=virtio-disk1'
> > for write with FD -1
>
> What's the reply of command 'device_add'? Can you provide it. I think it
> should fail.
>
> Thanks.
> Wen Congyang
>
> >
> > Than you very much.
> >
> > Shi
> >
> >
> >
> >
> >
> > On Thu, Mar 3, 2011 at 10:12 PM, Wen Congyang <wency at cn.fujitsu.com>
> wrote:
> >
> >> At 03/04/2011 01:00 PM, Shi Jin Write:
> >>>>
> >>>>
> >>>>
> >>>>     <disk type='file' device='disk'>
> >>>>       <driver name='qemu' type='qcow2' cache='none'/>
> >>>>      <source file='/var/lib/libvirt/images/rhel6rc_64.img'/>
> >>>>      <target dev='hda' bus='ide'/>
> >>>>      <alias name='ide0-0-0'/>
> >>>>      <address type='drive' controller='0' bus='0' unit='0'/>
> >>>>    </disk>
> >>>>    <disk type='file' device='cdrom'>
> >>>>      <driver name='qemu' type='raw'/>
> >>>>      <source file='/var/lib/libvirt/images/test.iso'/>
> >>>>      <target dev='hdc' bus='ide'/>
> >>>>      <readonly/>
> >>>>      <alias name='ide0-1-0'/>
> >>>>      <address type='drive' controller='0' bus='1' unit='0'/>
> >>>>    </disk>
> >>>>     <disk type='file' device='disk'>
> >>>>      <driver name='file' type='qcow2'/>
> >>>>       <source file='/var/lib/libvirt/images/test3.img'/>
> >>>>       <target dev='vdb' bus='virtio'/>
> >>>>       <alias name='virtio-disk1'/>
> >>>>      <address type='pci' domain='0x0000' bus='0x00' slot='0x06'
> >>>> function='0x0'/>
> >>>>    </disk>
> >>>>    <controller type='ide' index='0'>
> >>>>      <alias name='ide0'/>
> >>>>      <address type='pci' domain='0x0000' bus='0x00' slot='0x01'
> >>>> function='0x1'/>
> >>>>    </controller>
> >>>>
> >>>>
> >>>> Thank you very much. It is exactly the same output as mine,
> particularly
> >>>  <driver name='file' type='qcow2'/>
> >>> I thought it has to be name='qemu' to detach properly but since you
> >> didn't
> >>> have a problem, I am very lost on why mine didn't work.
> >>>
> >>> My libvirtd.log shows (with debugging turned on)
> >>> 14:43:18.965: debug : qemuMonitorCommandWithHandler:235 : Receive
> command
> >>> reply ret=0 errno=0 33 bytes 'Device 'virtio-disk1' not found^M
> >>> '
> >>> 14:43:18.965: debug : virEventDispatchTimeouts:405 : Dispatch 3
> >>> 14:43:18.965: debug : virEventDispatchHandles:450 : Dispatch 8
> >>> 14:43:18.965: error : qemuMonitorTextDelDevice:2314 : operation failed:
> >>> detaching virtio-disk1 device failed: Device 'virtio-disk1' not found^M
> >>>
> >>> Do you know what the "device not found" error means?
> >>
> >> It seems attaching virtio-disk1 failed.
> >> Can you provide the log when you attach virtio-disk1?
> >>
> >> Thanks.
> >> Wen Congyang
> >>
> >>>
> >>> Thanks.
> >>>
> >>> Shi
> >>>
> >>
> >>
> >
> >
>
>


-- 
Shi Jin, Ph.D.
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