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

2013/2/1 harryxiyou <harryxiyou gmail com>
On Fri, Feb 1, 2013 at 6:14 PM, Gao Yongwei <itxx00 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?
soga,you may not understand my english,^^,if you can speak Chinese I think I can help you more comfortable.
I will try my best to share my experience.
to get a bootable disk with os installed, you could try this command:
wget http://wiki.qemu.org/download/linux-0.2.img.bz2
bunzip2 linux-0.2.img.bz2
kvm-img convert -t directsync linux-0.2.img sheepdog:test 
>> 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'.
virt-install does not belong to libvirt,but if you use RHEL or CentOS you could install this tool from yum:
yum provides */virt-install
or you can get the source from virt-manager.org 
>> 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?
to boot a vm from sheep vol you can use command like:
kvm -hda sheepdog:test -hdb sheepdog:data
>> 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.
because VM's default vnc configuration in libvirt xml just binding the vnc port to,you can change the default ip address of vnc using virsh:
virsh edit testvm 

Harry Wei


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