Sharing AWS RDS Snapshots: A Comprehensive Guide

Amazon Relational Database Service (RDS) snapshots are crucial for data backup, disaster recovery, and testing. Sharing these snapshots with other AWS accounts enables collaboration, simplifies database replication, and facilitates efficient resource management. This article provides a detailed guide on how to share RDS snapshots securely and effectively.

What are AWS RDS Snapshots?

An RDS snapshot is a point-in-time copy of your database instance. There are two types: manual and automated. Manual snapshots are initiated by the user and retained until explicitly deleted, whereas automated snapshots are created automatically based on a defined retention period. Both can be shared, though automated snapshots require an initial copy before sharing. AWS Documentation

Why Share RDS Snapshots?

Sharing snapshots offers several benefits:

• Collaboration: Enables teams in different AWS accounts to work with the same database data.
• Disaster Recovery: Provides a readily available backup in another account for disaster recovery purposes.
• Testing and Development: Allows developers to create test environments based on production data without impacting live systems.
• Data Migration: Facilitates the migration of databases between AWS accounts.

How to Share a Manual RDS Snapshot

Here’s a step-by-step guide to sharing a manual RDS snapshot:

1. Open the Amazon RDS Console: Navigate to the Amazon RDS console in the AWS Management Console.
2. Select Snapshots: In the navigation pane, choose “Snapshots.”
3. Choose the Snapshot: Select the manual DB snapshot you want to share.
4. Actions > Share Snapshot: Choose “Actions” and then “Share Snapshot.”
5. Specify Account ID: Enter the AWS account ID you want to grant access to. You can share with up to 20 accounts. AWS Knowledge Center
6. Save: Choose “Save” to confirm the sharing permissions.

Sharing Encrypted RDS Snapshots

Sharing encrypted snapshots requires additional steps to ensure the recipient account can access the data. You cannot directly share an encrypted snapshot. Instead, you must create a copy of the snapshot and associate it with a KMS key that allows access to the destination account. Opstree Blog

The process involves:

1. Create a KMS Key: Create a symmetric KMS key with permissions granted to the destination AWS account.
2. Copy the Snapshot: Create a copy of the encrypted snapshot and select the newly created KMS key.
3. Share the Copied Snapshot: Share the copied snapshot with the destination account.

Restoring from a Shared Snapshot

The recipient account can restore a DB instance from a shared snapshot using the RDS console, AWS Command Line Interface (AWS CLI), or Amazon RDS API. When using the CLI or API, specify the full Amazon Resource Name (ARN) of the shared snapshot as the snapshot identifier. AWS Documentation

Managing Snapshot Permissions

You can modify snapshot permissions at any time. To revoke access for an account, select the “Delete” checkbox next to the account ID in the “Snapshot permissions” pane and choose “Save.”

Limitations and Considerations

• Account Limit: You can share a snapshot with a maximum of 20 AWS accounts.
• Encryption: Sharing encrypted snapshots requires careful management of KMS keys and permissions.
• Snapshot Type: Automated snapshots must be copied before they can be shared.

Frequently Asked Questions (FAQ)

Can I share snapshots publicly?

Yes, you can set snapshot visibility to “Public,” allowing any AWS account to restore from it. However, this is generally not recommended for security reasons.

What happens if the snapshot owner deletes the original snapshot?

The shared snapshot remains available to the recipient account, but it’s best practice to ensure the owner doesn’t delete the original while it’s being used by others.

Can I share snapshots across AWS Regions?

Snapshots are region-specific. To share a snapshot across regions, you must copy it to the destination region first.

Sharing RDS snapshots is a powerful feature for collaboration, disaster recovery, and data management within AWS. By following these guidelines, you can ensure secure and efficient snapshot sharing across your organization.