Request Parameters Response Elements Errors Examples See Also

FailoverDBCluster

Forces a failover for a DB cluster.

For an Aurora DB cluster, failover for a DB cluster promotes one of the Aurora Replicas (read-only instances) in the DB cluster to be the primary DB instance (the cluster writer).

For a Multi-AZ DB cluster, after RDS terminates the primary DB instance, the internal monitoring system detects that the primary DB instance is unhealthy and promotes a readable standby (read-only instances) in the DB cluster to be the primary DB instance (the cluster writer). Failover times are typically less than 35 seconds.

An Amazon Aurora DB cluster automatically fails over to an Aurora Replica, if one exists, when the primary DB instance fails. A Multi-AZ DB cluster automatically fails over to a readable standby DB instance when the primary DB instance fails.

To simulate a failure of a primary instance for testing, you can force a failover. Because each instance in a DB cluster has its own endpoint address, make sure to clean up and re-establish any existing connections that use those endpoint addresses when the failover is complete.

For more information on Amazon Aurora DB clusters, see What is Amazon Aurora? in the Amazon Aurora User Guide.

For more information on Multi-AZ DB clusters, see Multi-AZ DB cluster deployments in the Amazon RDS User Guide.

Request Parameters

For information about the parameters that are common to all actions, see Common Parameters.

DBClusterIdentifier

The identifier of the DB cluster to force a failover for. This parameter isn't case-sensitive.

Constraints:

Must match the identifier of an existing DB cluster.

Type: String

Required: Yes

TargetDBInstanceIdentifier

The name of the DB instance to promote to the primary DB instance.

Specify the DB instance identifier for an Aurora Replica or a Multi-AZ readable standby in the DB cluster, for example mydbcluster-replica1.

This setting isn't supported for RDS for MySQL Multi-AZ DB clusters.

Type: String

Required: No

Response Elements

The following element is returned by the service.

DBCluster

Contains the details of an Amazon Aurora DB cluster or Multi-AZ DB cluster.

For an Amazon Aurora DB cluster, this data type is used as a response element in the operations CreateDBCluster, DeleteDBCluster, DescribeDBClusters, FailoverDBCluster, ModifyDBCluster, PromoteReadReplicaDBCluster, RestoreDBClusterFromS3, RestoreDBClusterFromSnapshot, RestoreDBClusterToPointInTime, StartDBCluster, and StopDBCluster.

For a Multi-AZ DB cluster, this data type is used as a response element in the operations CreateDBCluster, DeleteDBCluster, DescribeDBClusters, FailoverDBCluster, ModifyDBCluster, RebootDBCluster, RestoreDBClusterFromSnapshot, and RestoreDBClusterToPointInTime.

For more information on Amazon Aurora DB clusters, see What is Amazon Aurora? in the Amazon Aurora User Guide.

For more information on Multi-AZ DB clusters, see Multi-AZ deployments with two readable standby DB instances in the Amazon RDS User Guide.

Type: DBCluster object

Errors

For information about the errors that are common to all actions, see Common Errors.

DBClusterNotFoundFault

DBClusterIdentifier doesn't refer to an existing DB cluster.

HTTP Status Code: 404

InvalidDBClusterStateFault

The requested operation can't be performed while the cluster is in this state.

HTTP Status Code: 400

InvalidDBInstanceState

The DB instance isn't in a valid state.

HTTP Status Code: 400

Examples

Example

This example illustrates one usage of FailoverDBCluster.

Sample Request



https://rds.us-east-1.amazonaws.com/
    ?Action=FailoverDBCluster
    &DBClusterIdentifier=sample-cluster
    &SignatureMethod=HmacSHA256
    &SignatureVersion=4
    &Version=2014-10-31
    &X-Amz-Algorithm=AWS4-HMAC-SHA256
    &X-Amz-Credential=AKIADQKE4SARGYLE/20150323/us-east-1/rds/aws4_request
    &X-Amz-Date=20150323T170232Z
    &X-Amz-SignedHeaders=content-type;host;user-agent;x-amz-content-sha256;x-amz-date
    &X-Amz-Signature=9be705fa28a68244d5072722463a29a322f9ef8eb58a63c40a6f6547174dec44

Sample Response



<FailoverDBClusterResponse xmlns="http://rds.amazonaws.com/doc/2014-10-31/">
  <FailoverDBClusterResult>
    <DBCluster>
      <Port>3306</Port>
      <LatestRestorableTime>2015-03-23T17:00:54.893Z</LatestRestorableTime>
      <Engine>aurora</Engine>
      <Status>available</Status>
      <BackupRetentionPeriod>7</BackupRetentionPeriod>
      <VpcSecurityGroups>
        <VpcSecurityGroupMembership>
          <Status>active</Status>
          <VpcSecurityGroupId>sg-922dc2fd</VpcSecurityGroupId>
        </VpcSecurityGroupMembership>
      </VpcSecurityGroups>
      <DBSubnetGroup>sample-group</DBSubnetGroup>
      <EngineVersion>5.6.10a</EngineVersion>
      <Endpoint>sample-cluster.cluster-c1axbpgwvdfo.us-east-1.rds.amazonaws.com</Endpoint>
      <DBClusterParameterGroup>default.aurora5.6</DBClusterParameterGroup>
      <DBClusterIdentifier>sample-cluster</DBClusterIdentifier>
      <PreferredBackupWindow>05:47-06:17</PreferredBackupWindow>
      <PreferredMaintenanceWindow>mon:10:16-mon:10:46</PreferredMaintenanceWindow>
      <EarliestRestorableTime>2015-03-04T23:08:59.159Z</EarliestRestorableTime>
      <DBClusterMembers>
        <DBClusterMember>
          <IsClusterWriter>false</IsClusterWriter>
          <DBInstanceIdentifier>sample-replica1</DBInstanceIdentifier>
          <DBClusterParameterGroupStatus>in-sync</DBClusterParameterGroupStatus>
        </DBClusterMember>
        <DBClusterMember>
          <IsClusterWriter>true</IsClusterWriter>
          <DBInstanceIdentifier>sample-primary</DBInstanceIdentifier>
          <DBClusterParameterGroupStatus>in-sync</DBClusterParameterGroupStatus>
        </DBClusterMember>
      </DBClusterMembers>
      <AllocatedStorage>1</AllocatedStorage>
      <MasterUsername>awsuser</MasterUsername>
    </DBCluster>
  </FailoverDBClusterResult>
  <ResponseMetadata>
    <RequestId>659c3dba-d17e-11e4-9fd0-35e9d88e2515</RequestId>
  </ResponseMetadata>
</FailoverDBClusterResponse>