On 01/20/2014 11:30 PM, Satya Vempati wrote:
Thanks Juan and Itamar.
As Juan said, I am trying take a file that I have that contains the image of a
disk and create a disk in the system with the same content
I am taking a similar approach to the one Juan described. I am creating a VM
and then creating a new disk with the same size and attributes as my disk
image. Then I am replacing the disk image of the new disk with the file that
contains the image of the disk I want. That seems to work but seemed too
hacky/clumsy. I was hoping there is a more straightforward/clean way to do this.
you can just place the disk on the storage, register the disk, and
attach it to a VM?
-----Original Message-----
From: Juan Hernandez [mailto:jhern...@redhat.com]
Sent: Saturday, January 18, 2014 8:27 AM
To: Satya Vempati; users@ovirt.org
Cc: Itamar Heim
Subject: Re: [Users] Register a disk image via oVirt REST api
On 01/17/2014 11:28 PM, Itamar Heim wrote:
On 01/16/2014 07:21 PM, Satya Vempati wrote:
I have a disk image (i.e. a file) that I want to register as a disk
using the REST API.
The REST API works with existing disks, but does the API work with
disk images?
can you pleas explain what do you mean by an image compared to a disk?
I think that what you want is to take a file that you have that contains the
image of a disk and create a disk in the system with the same content.
As far as I know we don't have any direct way to do this. You will need to
create an empty disk in oVirt, and then attach it to a virtual machine. Once it
is attached to that virtual machine then you can write to it, but always via
the virtual machine. For example, you can use the API as follows to create a
new disk that isn't attached to any VM:
curl \
-k \
-X POST \
-H "Accept: application/xml" \
-H "Content-Type: application/xml" \
-d "
<disk>
<name>newdisk</name>
<size>1073741824</size>
<format>raw</format>
<interface>virtio</interface>
</disk>
" \
-u admin@internal:****** \
https://rhel.example.com/api/storagedomains/the_id_of_the_storage_domain/disks
Then prepare a VM that you will use to copy the contents of your file to the
new disk, and use the API to attach the new disk to this VM (you can preserve
this VM, and use multiple times for this purpose):
curl \
-k \
-X POST \
-H "Accept: application/xml" \
-H "Content-Type: application/xml" \
-d "
<disk id='the_id_of_the_disk'/>
" \
-u admin@internal:****** \
https://rhel.example.com/api/vms/the_id_of_the_vm/disks
(Note that in order to attach the disk you have to provide the disk id returned
by the API when you created it.)
Then activate the disk, so that the VM can see it:
curl \
-k \
-X POST \
-H "Accept: application/xml" \
-H "Content-Type: application/xml" \
-d "
<action/>
" \
-u admin@internal:****** \
https://rhel.example.com/api/vms/the_id_of_the_vm/disks/the_id_of_the_disk/activate
Now you will have to copy the contents of the file to the disk via the VM. For
example, assuming that you have SSH enabled on that VM and that the disk device
inside the VM is /dev/vdb (it won't allways be this, depends on the number and
order of attached disks) you can do something like this:
ssh root@myvm 'cat > /dev/vdb' < myfile.img ssh root@myvm 'sync'
Once the contents of the file have been copied you can deactivate the disk and
detach it from this intermediate VM, and maybe attach it to another one.
Take into account that all these operations are lengthy ones, specially the operation to
create the disk, and that the RESTAPI will usually return once the operation is
initiated, so you will need to wait till they are finished. For example, when creating
the disk you should poll the state of the VM till it is "ok".
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