[sheepdog-users] [Sheepdog][Libvirt]Test boot VMs from sheepdog volumes in Libvirt

harryxiyou harryxiyou at gmail.com
Fri Feb 1 12:47:06 CET 2013

On Fri, Feb 1, 2013 at 6:14 PM, Gao Yongwei <itxx00 at gmail.com> wrote:
>> We can get "Boot VMs from sheepdog volumes in Libvirt" way
>> from https://github.com/collie/sheepdog/wiki/Libvirt like following.
>>   a,  prepare a file containing an XML domain description
>>     $ cat > sheepdog.xml
>>     <domain type='qemu'>
>>       <name>testvm</name>
>>       <memory>1048576</memory>
>>       <os>
>>         <type arch='x86_64'>hvm</type>
>>       </os>
>>       <devices>
>>         <disk type='network'>
>>           <source protocol="sheepdog" name="testvdi"/>
>>           <target dev='hda' bus='ide'/>
>>         </disk>
>>         <graphics type='vnc' port='-1' autoport='yes'/>
>>       </devices>
>>     </domain>
>>   b,  boot from testvdi with virsh
>>     $ virsh create sheepdog.xml
>>   c,  connect to a VNC console of the running VM
>>     $ vncviewer localhost
>> I have some following questions about up three steps.
>> 1, Before a or b(up boot step) step, should we have to install our OS
>> into 'testvdi'?
> As I know, you should install an OS in the disk,or cannot boot from a 'NULL'
> disk.you know what i mean.

You just said with a common sense, which has no *real* help for me. *Please*
see the step a then explain how to install os into testvdi. I think boot from
VMs from Sheepdog volumes, which has to install OS into Sheepdog volumes.
How should we install OS into Sheepdog volumes?

>> That is to say, we have to install OS from os.iso file into 'testvdi',
>> which should use
>> 'qemu-system-x86_64' command to install OS, right?
> To install an OS, you could use 'virt-install' ,or use the virt-manager GUI
> tool.

Are you sure about your words? I think Step a boots VM from testvdi, which
is a Sheepdog volume. You could use 'virt-install' to install a OS into Sheepdog
volumes, like testvdi?

BTW: Does 'virt-install' belong to Libvirt library source code? After i compile
libvirt source code, i cannot find 'virt-install'.

>> 3, This is the storage online management in Libvirt, right?
> later version of libvirt support managing sheepdog storage,use may have a
> search at libvirt.org.

Have you ever booted a VM from Sheepdog volume? What steps did you
do to finish this job?

>> 4, This test just test the codes Morita take a patch named "add
>> network disk support"
>> for Libvirt, which is located here:
>> http://libvirt.org/git/?p=libvirt.git;a=commit;h=036ad5052b43fe9f0d197e89fd16715950408e1d
>> and also test Sheepdog driver for QEMU, right?
> I think just test libvirt environment..

You may not understand my question.

>> 5, If i installed a 32bits OS to testvdi, should i modify
>>       <os>
>>         <type arch='x86_64'>hvm</type>
>>       </os>
>> to be
>>       <os>
>>         <type arch='x86'>hvm</type>
>>       </os>
>> , right?
> If  arch='x86_64', then this configuration support both x86 and x64.

What is *x64*? I am not clear about your words.

>> 6, The step c (up boot step), which is
>>  $ vncviewer localhost
>> Actually, i am not clear about this 'localhost'. Why should we link
>> localhost but other ip addresses?
> As localhost allways singed to ,or you can use instead
> of a name like 'locallhost'.

I just ask why we should link localhost. *NOT* what is localhost. You may not
understand my question.

Thanks for your suggestions.

Harry Wei

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