Steps to shrink an AWS ECS EBS volume

Could you please try the following method to shrink your EBS volume:

1) Create a volume from your snapshot with the original volume size.
2) Create a new volume in the same Availability zone as the volume you just created above but use a size of 10GB.
3) Launch a new instance in the same availability zone as the volumes (do not add volumes etc to the instance).
4) Attach both volumes to the instance. Attach your large volume on /dev/sdf and the 10GB volume on /dev/sdg
5) SSH into the instance and make a file system on the new volume 'sudo mkfs.ext3 /dev/xvdg'
6) Mount both volumes: 'sudo mkdir /mnt/old | sudo mount /dev/xvdf /mnt/old' and 'sudo mkdir /mnt/new | sudo mount /dev/xvdg /mnt/new'
7) Use rsync to copy the volumes: 'rsync -aHAXxSP /mnt/old /mnt/new'
8) Unmount the volumes 'sudo umount /dev/xvdf | sudo umount /dev/xvdg'
9) Stop the instance
10) Detach all the volumes from the instance including the root volume.
11) Attach the 10GB volume to the instance on /dev/sda1
12) Start the instance and verify the volume side using 'df -h'
13) Take an AMI of this instance.