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 : [email protected] > Unsubscribe : https://launchpad.net/~openstack > More help : https://help.launchpad.net/ListHelp
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