libvirt users - Sep 2019 - could not create snapshotxml on encryption image

hi ，everyone!
I am a newcomer to Libvirt, and I don't know if it's a native question,


I create snapshots of virtual machines that use encrypted disk, The console gave
me the following error:


Traceback(most recent call last):
    File "/usr/lib/python2.7/site-packages/vdsm/virt/vm.py",line 4613,
in snapshot
          self._dom,snapshotCreateXML(snapxml, snapFlags)
    File "/usr/lib/python2.7/site-packages/vdsm/virt/virdomain.py", in
line 98, in f
           ret = attr(*args, **kwargs)
    File
"/usr/lib/python2.7/site-packages/vdsm/common/libvirtconnection.py",
line 130, in wrapper
    ret = f(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/vdsm/common/function.py",
line 92, in wrapper
    return func(inst, *args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/libvirt.py", line 2620, in
snapshotCreateXML
    if ret is None:raise libvirtError('virDomainSnapshotCreateXML()
failed', dom=self)
 libvirtError: internal error: unable to execute QEMU command
'transaction': Parameter 'encrypt.key-secret' is required for
cipher


And try adding encryption fields to domainsnapshot, as shown below


<?xml version='1.0' encoding='utf-8'?>
<domainsnapshot>
<disks>
<disk name="sda" snapshot="external"
type="file">
<source
file="/rhev/data-center/mnt/192.168.1.13:_exports_data/168bc099-3ff1-44e8-ba2f-face1594db63/images/eed78b32-f257-445f-8f2e-b5c969ee38e8/da869c1d-f6bb-4816-be6a-f4d1d2ae2af2"
type="file" />        #enc
                 <encryption format="luks">
<secret type="passphrase"
uuid="694bdf38-214e-48d3-8c4c-9dbbcf0f5fa0" />
</encryption>
</disk>
   </disks>
<memory
file="/rhev/data-center/mnt/192.168.0.91:_exports_data/168bc099-3ff1-44e8-ba2f-face1594db63/images/6236ecf4-0eb5-4879-bb6d-251ae84b55f8/f086c613-d1c2-4ab3-851e-97961173d1d6"
snapshot="external" />   # notenc
     </domainsnapshot>


But there are still the same mistakes. I don't know whether the encrypted
snapshot supports this operation or whether I added encryption information in
the wrong way.


This problem has been bothering me for a long time. Any tips or help will be
appreciated. Thank you


| |
18781374080
|
|
18781374080@163.com
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签名由网易邮箱大师定制

On Fri, Sep 06, 2019 at 14:39:56 +0800, 18781374080
wrote:
> hi ，everyone!
> I am a newcomer to Libvirt, and I don't know if it's a native
question,
> 
> 
> I create snapshots of virtual machines that use encrypted disk, The console
gave me the following error:
> 
> 
> Traceback(most recent call last):
>     File "/usr/lib/python2.7/site-packages/vdsm/virt/vm.py",line
4613, in snapshot
>           self._dom,snapshotCreateXML(snapxml, snapFlags)
>     File
"/usr/lib/python2.7/site-packages/vdsm/virt/virdomain.py", in line 98,
in f
>            ret = attr(*args, **kwargs)
>     File
"/usr/lib/python2.7/site-packages/vdsm/common/libvirtconnection.py",
line 130, in wrapper
>     ret = f(*args, **kwargs)
>   File
"/usr/lib/python2.7/site-packages/vdsm/common/function.py", line 92,
in wrapper
>     return func(inst, *args, **kwargs)
>   File "/usr/lib64/python2.7/site-packages/libvirt.py", line
2620, in snapshotCreateXML
>     if ret is None:raise libvirtError('virDomainSnapshotCreateXML()
failed', dom=self)
>  libvirtError: internal error: unable to execute QEMU command
'transaction': Parameter 'encrypt.key-secret' is required for
cipher
> 
Hi, encrypted snapshots will be possible only when using the new
'blockdev' approach to configuring disk sources. The work on that is
almost done. It's possible that the next upstream release will support
it.