Create an EBS EMI

To create a new EMI that is used to boot EBS-backed instances:

Create a new volume whose size matches the size of the bootable .img file:
```
euca-create-volume -z <cluster_name> -s <size_GB>
```

Attach the volume to a helper instance:

euca-attach-volume vol-<nnnnnnnn> -i i-<nnnnnnnn> -d <device>

Log in to the instance and copy the bootable image from its source to the helper instance.
While logged in to the helper instance, copy a bootable image to the attached volume:
```
dd if=/<path_to_image> of=<device> bs=1M
```
While logged in to the helper instance, flush the file system buffers after running the dd command:
```
sync
```
Detach the volume from the instance:
```
euca-detach-volume vol-<nnnnnnnn>
```
Create a snapshot of the bootable volume:
```
euca-create-snapshot vol-<nnnnnnnn>
```

euca-register --name "<descriptive_name>" /
   --snapshot snap-<nnnnnnnn>

Run a new EBS-backed instance:

euca-run-instances -k <key_name> emi-<nnnnnnnn>

Note: The snapshot cannot be deleted unless the EMI is first deregistered.