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RDS DB clusters should be configured for multiple Availability Zones

Severity: Medium

Resource Types: AWS::RDS::DBCluster

Description​

This control checks whether high availability is enabled for your RDS DB clusters.

RDS DB clusters should be configured for multiple Availability Zones to ensure availability of the data that is stored. Deployment to multiple Availability Zones allows for automated failover in the event of an Availability Zone availability issue and during regular RDS maintenance events.

Remediation​

To remediate this control, configure your DB cluster for multiple Availability Zones.

To enable multi-AZ for a DB cluster

  1. Open the Amazon RDS console.
  2. In the navigation pane, choose Databases, and then choose the DB instance to modify.
  3. Choose Modify. The Modify DB Instance page appears.
  4. Under Instance Specifications, set Multi-AZ deployment to Yes.
  5. Choose Continue and check the summary of modifications.
  6. Choose Continue.
  7. (Optional) Choose Apply immediately to apply the changes immediately. Choosing this option can cause an outage in some cases. For more information, see Using the Apply Immediately setting

On the confirmation page, review your changes. If they are correct, choose Modify DB Instance.