images.md

Mouting an Image for Modifications

Mount the image. If the iamge is QEMU QCOW2 image, do the following.

sudo modprobe nbd max_part=63
sudo qemu-nbd -c /dev/nbd0 ~/precise-server-cloudimg-amd64
sudo mount /dev/nbd0p1 /mnt/myimage

Then you can change image contents from /mnt/myimage, or through chroot /mnt/myimage. Add a /var/lib/cloud/scripts/per-instance script to this image.

For ami Ubuntu image

curl --header 'x-auth-token:blah'
    http://glance:9292/v1/images/uuid1
    -o myimage
sudo mkdir /mnt/emi
sudo mount -o loop ~/myimage /mnt/myimage
sudo chroot /mnt/myimage

# Make changes
exit
sudo umount /dev/loop0