[one-users] Having troubles creating qcow2 datablocks using oneimage

[Jaime Melis]

Hello Jhon,

It's not possible to dynamically create qcow2 datablocks out of the
box. There's a guide at C12G that describes how to modify the TM
scripts to do so:

https://support.opennebula.pro/entries/348847-using-qcow-images

Cheers,
Jaime


On Tue, Dec 13, 2011 at 3:43 PM, Jhon Masschelein
<Jhon.Masschelein at sara.nl> wrote:
> Hi,
>
> I am having troubles creating qcow2 datablocks using oneimage.
>
> According to http://opennebula.org/documentation:rel3.0:img_template the
> oneimage template can contain a DRIVER parameter (optional) that can be KVM:
> raw, qcow2.
>
> I created a template (borrowed from the web page):
>
> NAME          = "Experiment results"
> TYPE          = DATABLOCK
> # No PATH set, this image will start as a new empty disk
> SIZE          = 204800
> FSTYPE        = ext3
> PUBLIC        = NO
> DESCRIPTION   = "Storage for my Thesis experiments."
> DRIVER        = qcow2
>
> where I added the DRIVER line.
>
> Creating the image using oneimage create image.txt does however not create a
> qcow image:
>  ls -hl /var/lib/one/images/c0dc71ebe6562d4e8c9e186b249bff13
> -rw-rw---- 1 oneadmin oneadmin 201G Dec 13 15:15
> /var/lib/one/images/c0dc71ebe6562d4e8c9e186b249bff13
> file /var/lib/one/images/c0dc71ebe6562d4e8c9e186b249bff13
> /var/lib/one/images/c0dc71ebe6562d4e8c9e186b249bff13: Linux rev 1.0 ext3
> filesystem data (large files)
>
> Looking at the source, I thinkg I found where the image gets created (please
> correct me if I am wrong here):
> /src/image_mad/remotes/fs/mkfs
>
> In this script, the image is allways created using dd. There is no check for
> the driver and no qemu-img possibility.
>
> It looks like oneimage can only create raw datablocks which is a pitty. We
> realy would like to use the small qcow2 format.
>
> Now I do not mind adding the functionality myself if it is not available at
> the moment, I just want to be sure I am not duplicating work. :)
>
> I am aware I can use the qemu-img command myself to create those datablocks,
> but I would like the sunstone interface to be able to create them
> automatically, so I need a oneimage template that makes this work.
>
> Best regards,
>
> Jhon
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-- 
Jaime Melis
Project Engineer
OpenNebula - The Open Source Toolkit for Cloud Computing
www.OpenNebula.org | jmelis at opennebula.org



-- 
Jaime Melis
Project Engineer
OpenNebula - The Open Source Toolkit for Cloud Computing
www.OpenNebula.org | jmelis at opennebula.org