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not sure if this is the best way ... 

# create a backing file
truncate --size 2GB precise-backing-file
losetup -f precise-backing-file
losetup -a
# find what /dev/loopX was used - eg /dev/loop1

mkfs /dev/loop1
mkdir mnt
mount /dev/loop1 mnt
cd mnt
# root tar from https://cloud-images.ubuntu.com/
tar -xvf /vagrant/precise-server-cloudimg-amd64-root.tar.gz
cd ../
umount /dev/loop1 

glance image-create --name my-lxc-test --is-public True --disk-format raw --container-format bare --progress --file /tmp/precise-backing-file





Dmitry Guryanov dguryanov at parallels.com
Thu Feb 5 14:00:01 UTC 2015

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Hello,

Where do people obtain glance images for nova/lxc? Cloud images for KVM 
can't run in LXC container because first, image should be slightly 
modified (because it doesn't have its own kernel) and also it should be 
single FS, not an image with partition table.

The only way which I found to start sort of a container is to download 
an image from OpenVZ size, covert it to raw format without partition 
table. At least it runs init and some processes, but it doesn't work 
completely...

-- 
Dmitry Guryanov