s3u/images.md

## images.md

      
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              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