create_image_for_other.sh

#!/bin/bash

cd /root
ec2-bundle-vol -d /mnt --privatekey [path of other private key(pk-XXXX.pem] ¥
 --cert [path of other cert(cert-XXXX.pem)] ¥
 --user [other user id(XXXX-XXXX-XXXX)] ¥
 --fstab /etc/fstab

ec22s3_for_other.sh

#!/bin/bash

cd /root
ec2-upload-bundle --bucket [bucket name] ¥
 --manifest /mnt/image.manifest.xml ¥
 --access-key [other access key] ¥
 --secret-key [other secret key]