ogelbukh at mirantis
May 28, 2012, 12:22 AM
Post #4 of 4
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Re: Why is an image required when booting from volume
[In reply to]
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Gabriel,
There is a folsom-targeted blueprint for #2 at least:
https://blueprints.launchpad.net/nova/+spec/auto-create-boot-volumes
--
Oleg
On Sun, May 27, 2012 at 10:51 PM, Gabriel Hurley
<Gabriel.Hurley [at] nebula>wrote:
> To the best of my understanding there are two parts to this, neither of
> which is fully where it ought to be:****
>
> ** **
>
> **1. **It shouldn’t be a required parameter. If you give it a
> volume with everything it needs and not an image it should try to boot from
> that without throwing an exception. Horizon only enforces the requirement
> because Nova does.****
>
> **2. **As an optional parameter, specifying an image should allow
> you to create the instance with that image loaded onto the volume, which is
> a very important part of the workflow for creating your own bootable
> volumes. This feature doesn’t currently exist in Nova, however.****
>
> ** **
>
> I also don’t know offhand if there are blueprints or bug reports for
> either of those…****
>
> ** **
>
> **- **Gabriel****
>
> ** **
>
> *From:* openstack-bounces+gabriel.hurley=nebula.com [at] lists[mailto:
> openstack-bounces+gabriel.hurley=nebula.com [at] lists] *On
> Behalf Of *Vishvananda Ishaya
> *Sent:* Saturday, May 26, 2012 8:35 PM
> *To:* Lorin Hochstein
> *Cc:* openstack [at] lists (openstack [at] lists)
> *Subject:* Re: [Openstack] Why is an image required when booting from
> volume****
>
> ** **
>
> If there is a separate kernel and ramdisk needed for the boot from volume,
> it is pulled from image properties. Otherwise it is basically useless.***
> *
>
> ** **
>
> Vish****
>
> ** **
>
> On May 26, 2012, at 8:22 AM, Lorin Hochstein wrote:****
>
>
>
> ****
>
> I'm trying to figure out boot from volume, both so I can use it and so I
> can add it to the docs. ****
>
> ** **
>
> ** **
>
> It seems that when calling "nova boot" or using Horizon, you need to
> specify an image. Why is that?****
>
> ** **
>
> I naively tried to create a volume image by creating a volume and then
> doing on my volume server:****
>
> ** **
>
> dd if=/tmp/precise-server-cloudimg-amd64-disk1.img
> of=/dev/nova-volumes/volume-0000000d****
>
> ** **
>
> Then I tried this:****
>
> ** **
>
> $ nova boot --flavor 2 --key_name lorin --block_device_mapping
> /dev/vda=13:::0 test****
>
> ** **
>
> Which generated an error:****
>
> ** **
>
> Invalid imageRef provided. (HTTP 400)****
>
> ** **
>
> If I try to specify an image, it at least attempts to boot:****
>
> ** **
>
> $ nova boot --flavor 2 --key_name lorin --block_device_mapping
> /dev/vda=13:::0 --image 7d6923d9-1c13-4405-ba0c-41c7487dd6bc test****
>
> ** **
>
> I noticed that the devstack example specifies an image:
> https://github.com/openstack-dev/devstack/blob/master/exercises/boot_from_volume.sh
> :****
>
> ** **
>
> VOL_VM_UUID=`nova boot --flavor $INSTANCE_TYPE --image $IMAGE
> --block_device_mapping vda=$VOLUME_ID:::0 --security_groups=$SECGROUP
> --key_name $KEY_NAME $VOL_INSTANCE_NAME | grep ' id ' | get_field 2`****
>
> ** **
>
> Looking at nova/api/openstack/compute/servers.py, it does look
> like _image_uuid_from_href() is called regardless of whether we are booting
> from volume or not. What is "--image" used for when booting from volume?**
> **
>
> ** **
>
> ** **
>
> Take care,****
>
> ** **
>
> Lorin****
>
> --****
>
> Lorin Hochstein****
>
> Lead Architect - Cloud Services****
>
> Nimbis Services, Inc.****
>
> www.nimbisservices.com****
>
> ** **
>
> ** **
>
> ** **
>
> ** **
>
> _______________________________________________
> Mailing list: https://launchpad.net/~openstack
> Post to : openstack [at] lists
> Unsubscribe : https://launchpad.net/~openstack
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>
> ** **
>
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