[Openstack] Glance x-image-meta-type raw vs machine
erik.carlin at rackspace.com
Mon Jan 10 18:49:41 UTC 2011
Correct me if I am wrong, but I believe AMIs use IMG so that should be
another disk format a well (it would be the only one in the AMI appliance
format unless AWS changes it). Is there enough variance in the virtual
disk and envelope formats over time that we want to include version
columns or would new versions just be another format choice.
On 1/10/11 10:59 AM, "John Purrier" <john at openstack.org> wrote:
>Jay, this makes a lot of sense. For disk formats I would suggest: VHD,
>VDI, VMDK, RAW, & QCOW2. For the appliance formats: OVF, OVA, & AMI.
>Conversion within Glance will need to be able to handle both disk image
>conversion and appliance format conversion.
>From: Jay Pipes [mailto:jaypipes at gmail.com]
>Sent: Monday, January 10, 2011 10:26 AM
>To: John Purrier
>Cc: Ewan Mellor; openstack at lists.launchpad.net
>Subject: Re: [Openstack] Glance x-image-meta-type raw vs machine
>And I think we need to come to an agreement on the terms used here...
>What is a "type" of virtual image? Do we mean a *disk* image format?
>Do we mean a *metadata envelope* type (OVF, AMI, etc)? Do we mean some
>"type" of system image or image part (kernel, ramdisk, etc)?
>What Glance is serving/registering is really called a *virtual
>appliance*, as described in this article:
>Change the Image model to have these following fields, instead of the
>existing "type" column:
>disk_format -- choice between ('VHD', 'VDI', 'VMDK')
>appliance_file_format -- choice between ('AMI','OVF')
>On Mon, Jan 10, 2011 at 11:11 AM, John Purrier <john at openstack.org> wrote:
>> My 2 cents... We need to define a transport-neutral specification that
>>allows us to encapsulate and copy/move a variety of virtual image
>>formats, this should be based on OVF. The envelope can contain both the
>>actual image as well as any required meta-data.
>> The image elements specified are very AMI specific, we should
>>generalize to be able to indicate the type of virtual image (i.e. AMI,
>>VHD, etc.). A test for POC can be a service that takes the data in the
>>OVF or what is stored in Glance to convert between formats. If we do
>>this correctly all of the required data will be available at the correct
>>point in the flow.
>> Don't know if this is directly applicable to the discussion point
>>below, but it is important that we get the fundamental
>>design/architecture concepts in place moving forward.
>> -----Original Message-----
>> From: openstack-bounces+john=openstack.org at lists.launchpad.net
>>[mailto:openstack-bounces+john=openstack.org at lists.launchpad.net] On
>>Behalf Of Jay Pipes
>> Sent: Monday, January 10, 2011 9:44 AM
>> To: Ewan Mellor
>> Cc: openstack at lists.launchpad.net
>> Subject: Re: [Openstack] Glance x-image-meta-type raw vs machine
>> On Sat, Jan 1, 2011 at 7:30 PM, Ewan Mellor <Ewan.Mellor at eu.citrix.com>
>>> What is the intended semantics of the Glance x-image-meta-type header
>>> ³raw² vs ³machine²?
>> When we pulled the Image model from Nova into Glance, there was a
>> field "image_type" that was limited to the strings "raw", "machine",
>> "kernel", and "ramdisk".
>> I'm open to changing this or using something like a "format" field
>> (AMI vs OVF, etc..)
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