Re: Is there an API for clone?

["éä" <lancerhuang@xxxxxxx>]

ï

Hi Alex,

 

Thanks for your flow chart. But I'm stuck in getting Storage Pool here.

I try to get StoragePoolPtr by using something like

 

 int num = virConnectNumOfStoragePools( conn );

 

it truns out num = 0;

 

I think I missed something and missunderstand the Storage Pool & Storage Volume. So I refer to the http://libvirt.org/archstorage.html and http://libvirt.org/guide/html/ , but guide book about storage is in status "TBD".  So, is there some tutorial or guideline I can follow to get the Storage Ptr and then get the XML description and finally clone one?

 

Thank you

 

Regards

 

 

2010-11-14

---

Lancer 

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åääï ajia

åéæéï 2010-11-12  10:40:27

æääï éä

æéï libvir-list

äéï Re: [libvirt] Is there an API for clone?

On 11/12/2010 02:07 AM, éä wrote:

Hi Alex

 

Thank you for your reply.

I just wanna make sure I'm not misunderstanding, virStorageVolGetXMLDesc & virStorageVolCreateXMLFrom together can do the clone process, am I right?

In fact, libvirt will call a group of APIs to complete vol-clone operation, you can track the whole calling process, it  looks like this:
                                              virsh vol-clone <vol-key> <newname>
                                                                           |
                                                                          V
                                                             virConnectOpenAuth
                                                                           |
                                                                          V
                                                        virStorageVolLookupByKey
                                                                           |
                                                                          V
                                                       virStoragePoolLookupByVolume  ('default' is default pool)
                                                                           |
                                                                          V
                                                       virStorageVolGetXMLDesc
                                                                           |
                                                                          V
                                                     virStorageVolCreateXMLFrom
                                                                           |
                                                                          V
                                                           virStorageVolGetName (twice)
                                                                           |
                                                                          V
                                                              virStorageVolFree    (twice)
                                                                           |
                                                                          V
                                                             virStoragePoolFree
                                                                           |
                                                                          V
                                                               virConnectClose
                                                   
                                                                                                  
  Alex

 

Regards

 

 

2010-11-12

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Lancer 

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åääï Alex Jia

åéæéï 2010-11-10  13:28:21

æääï éä

æéï libvir-list

äéï Re: [libvirt] Is there an API for clone?

Hi lancer,

As Osier said, libvirt hasn't a independent API for cloning an

existing guest, instead of using virStorageVolGetXMLDesc API to 

get a guest volume xml description and then calling  

virStorageVolCreateXMLFrom API to clone a new volume.

For python-virtinst component, you may use virt-clone to implement

this, for libvirt component, you may directly use python binding

API or virsh tool 'vol-clone' to implement it.

I hope it's helpful for you.

- Alex

----- Original Message -----

From: "éä" <lancerhuang@xxxxxxx>

To: "libvir-list" <libvir-list@xxxxxxxxxx>

Sent: Wednesday, November 10, 2010 9:30:28 AM GMT +08:00 Beijing / Chongqing / Hong Kong / Urumqi

Subject: [libvirt] Is there an API for clone?

Hi, guys 

I know there is a command "virt-clone", but I couldn't find the equivalent API here : http://libvirt.org/html/libvirt-libvirt.html 

So, is there an API to clone an existing VM or not? 

Thank you! 

Regards 

2010-11-10 

Lancer 

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