How should the Administrator implement this process?
Write a script to download the encrypted snapshot, decrypt it using the AWS KMS encryption key used to encrypt the snapshot, then create a new volume in each account.
Update the key policy to grant permission to the AWS KMS encryption key used to encrypt the snapshot with all relevant accounts, then share the snapshot with those accounts.
Create an Amazon EC2 instance based on the snapshot, then save the instance’s Amazon EBS volume as a snapshot and share it with the other accounts. Require each account owner to create a new volume from that snapshot and encrypt it.
Create a new unencrypted RDS instance from the encrypted snapshot, connect to the instance using SSH/RDP, export the database contents into a file, then share this file with the other accounts.
Explanations:
Decrypting the snapshot and creating a new volume manually is not a recommended approach, especially since RDS snapshots are managed by AWS and not intended to be manually decrypted.
By updating the key policy of the AWS KMS encryption key to grant access to relevant accounts, the snapshot can be shared while maintaining encryption at rest. This is the correct and most efficient method.
Creating an EC2 instance based on the snapshot and then sharing an EBS volume is unnecessary and inefficient. It introduces additional complexity and doesn’t preserve the encrypted state of the RDS snapshot.
Creating an unencrypted RDS instance and exporting the database contents is not ideal for sharing encrypted RDS snapshots, as it involves unnecessary manual steps and potentially exposes data during export.
Based on what I know, the answer is:
Update the key policy to grant permission to the AWS KMS encryption key used to encrypt the snapshot with all relevant accounts, then share the snapshot with those accounts.