[libvirt] problem attaching/detaching disk

[Shi Jin]

Finally, everything works for if I simply change my template to use the
/usr/libexec/qemu-kvm instead of /usr/bin/kvm, which is a symbolic link to
it.
Not sure why it matters but that does solve all the mysteries.

Shi

On Fri, Mar 4, 2011 at 9:56 AM, Shi Jin <jinzishuai at gmail.com> wrote:

> 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.
>
>


-- 
Shi Jin, Ph.D.
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