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:
Downloading and decrypting the snapshot using AWS KMS and manually creating a new volume in each account is not a recommended or efficient approach. This introduces unnecessary complexity and risk.
Sharing the encrypted snapshot is possible by updating the KMS key policy to allow access to other accounts. This ensures the snapshot remains encrypted and can be used by authorized accounts while maintaining data security.
Creating an EC2 instance from the snapshot and then saving it as a new snapshot is inefficient and unnecessary. RDS snapshots can be shared directly without involving EC2 instances, and this method does not guarantee encryption at rest.
Creating an unencrypted RDS instance and exporting the database contents manually is unnecessary and complex. It also bypasses encryption at rest, which violates the requirement that all data must remain encrypted.
I suspect that 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.