AWS bills $0.08 per GB per month for EBS devices. Currently, the default ECS-optimized AMI provisions EBS volumes from a 30GB snapshot, which requires that the EBS volume is also >= 30GB.
This will reduce our storage costs from 60GB x $0.08 = $4.80/month to 16GB x $0.08 = $1.28/month. The AWS Free Tier gives 30GB of EBS volumes for free for the first month, so we're currently being billed 30GB x $0.08 = $2.40/month for this. We'd pay nothing for 12 months after making this change.
Summary
AWS bills $0.08 per GB per month for EBS devices. Currently, the default ECS-optimized AMI provisions EBS volumes from a 30GB snapshot, which requires that the EBS volume is also >= 30GB.
We only use 3GB of storage, so it would be ideal to use an 8GB EBS volume. In order to support this, we need to pack our own subsidiary AMI by following this process: https://aws.amazon.com/blogs/containers/creating-custom-amazon-machine-images-with-the-ecs-optimized-ami-build-recipes/
This will reduce our storage costs from 60GB x $0.08 = $4.80/month to 16GB x $0.08 = $1.28/month. The AWS Free Tier gives 30GB of EBS volumes for free for the first month, so we're currently being billed 30GB x $0.08 = $2.40/month for this. We'd pay nothing for 12 months after making this change.