[Kimchi-devel] [RFC] create an image from VM for OOTB storage pool

[Royce Lv]

On 2014年07月07日 22:47, Sheldon wrote:
> On 07/07/2014 09:43 PM, Aline Manera wrote:
>>
>>
>> On 07/02/2014 11:11 AM, Sheldon wrote:
>>> Now OOTB ISO pool is available.
>>> we can copy an base image to OOTB ISO pool from VM.
>>>
>>> There will useful for when user want to create a image from an 
>>> existing VM.
>>> User create a VM and configure this VM. He want to create several VMs
>>> with this VM.
>>>
>>> There are two ways for him.
>>> 1. use backing store
>>> (http://libvirt.org/formatstorage.html#StorageVolBacking) for the
>>> existing img
>>> 2. create an base image to OOTB ISO pool from the existing VM.
>>> When are are snapshots on the VM base image.
>>> we should merge the all snapshots and the base image.
>>> Then he can create a template from this image.
>>> And create a VM from this template.
>>>
>>
>> That is what Royce proposed in "[RFC] Create VM from image"
>> Some tasks were already added to 1.3 Plan: 
>> https://github.com/kimchi-project/kimchi/wiki/Todo-1.3
> They are different.
> I means "create image from VM" not "create VM from image"
>
> Not sure you have try the glance of Openstack.
> Users can create VM from image in glance.
>
>
> Li Yong install a Openstack.
> Mark, royce and I have get agreement, we should create VM from an 
> image, it is a base function of a VM manage tool.
>
> But do we need to support a same  concept of Openstack glance?
>
> As I have comment in the the follow url.
> http://lists.ovirt.org/pipermail/kimchi-devel/2014-June/006217.html
>
> We should support 3 kinds of image.
> One is local independent image, we can upload this kind of image.
> One is remote image, kimchi can download from remote URL.
> Another are the disk devices of VM.
> It maybe a serious snapshot with a base image. So we should merge all 
> these snapshot to the base image.
> It maybe also a physical disk. we maybe need to convert it to file image.
>
>
> Also Openstack support image initialization.
> When we create a VM from a base image. we can configure it before VM 
> start.
> such as if it is a static IP in the image, we should change it before VM.
>
> There seems 2 kinds of method.
> One is libguestfs.
> Another is an attached new extra image with a script in it. Not well 
> know it. need to talk with our Openstack  developers.
Sheldon, As to the libguestfs modify image and cloud init function. 
Though they modified image, I think their point is to create a template 
which easy to boot.
Just create a img is not the ultimate target of the task, we target for 
creating a customized template.

Or would you pls give some cases that we *just* want to create a image 
instead of template? So we can evaluate if we have the necessity of 
creating a image from vm.
>>
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