Require Multi Availability Zones turned on for RDS Instances


Multi availability zones must be enabled for RDS Instances.

Remediation Steps

AWS Console

  • Navigate to RDS.

  • In the left navigation, select Snapshots.

  • Create a database snapshot.

  • Select the snapshot and click Actions > Restore Snapshot.

  • On the Restore DB Instance page, ensure Multi-AZ deployment is enabled.

  • Select Restore DB Instance.


  • List all RDS instances:

    • aws rds describe-db-instances --query 'DBInstances[*].DBInstanceIdentifier'

  • Check if each RDS instance has Multi-AZ enabled:

    • aws rds describe-db-instances --db-instance-identifier <instance name> --query 'DBInstances[*].MultiAZ'

  • If an instance shows “false”, create a snapshot of it:

    • aws rds create-db-snapshot --db-instance-identifier <instance name> --db-snapshot-identifier <name of new snapshot>

  • Restore snapshot to new database instance with Multi-AZ enabled:

    • aws rds restore-db-instance-from-db-snapshot --db-instance-identifier <new db instance name> --db-snapshot-identifier <name of second snapshot> --multi-az


Example Configuration

resource "aws_db_instance" "main" {
  multi_az             = true
  # other required fields here