Table Of Contents


User Guide

First time using the AWS CLI? See the User Guide for help getting started.

[ aws . docdb ]



Forces a failover for a DB cluster.

A failover for a DB cluster promotes one of the Amazon DocumentDB replicas (read-only instances) in the DB cluster to be the primary instance (the cluster writer).

If the primary instance fails, Amazon DocumentDB automatically fails over to an Amazon DocumentDB replica, if one exists. You can force a failover when you want to simulate a failure of a primary instance for testing.

See also: AWS API Documentation

See 'aws help' for descriptions of global parameters.


[--db-cluster-identifier <value>]
[--target-db-instance-identifier <value>]
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]


--db-cluster-identifier (string)

A DB cluster identifier to force a failover for. This parameter is not case sensitive.


  • Must match the identifier of an existing DBCluster .

--target-db-instance-identifier (string)

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

You must specify the instance identifier for an Amazon DocumentDB replica in the DB cluster. For example, mydbcluster-replica1 .

--cli-input-json (string) Performs service operation based on the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, the CLI values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally.

--generate-cli-skeleton (string) Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value input, prints a sample input JSON that can be used as an argument for --cli-input-json. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command.

See 'aws help' for descriptions of global parameters.


To force an Amazon DocumentDB cluster to failover to a replica

The following failover-db-cluster example causes the primary instance in the Amazon DocumentDB cluster sample-cluster to failover to a replica.

aws docdb failover-db-cluster \
    --db-cluster-identifier sample-cluster


    "DBCluster": {
        "AssociatedRoles": [],
        "DBClusterIdentifier": "sample-cluster",
        "EngineVersion": "3.6.0",
        "DBSubnetGroup": "default",
        "MasterUsername": "master-user",
        "EarliestRestorableTime": "2019-03-15T20:30:47.020Z",
        "Endpoint": "",
        "AvailabilityZones": [
        "LatestRestorableTime": "2019-03-18T21:35:23.548Z",
        "PreferredMaintenanceWindow": "sat:04:30-sat:05:00",
        "PreferredBackupWindow": "00:00-00:30",
        "Port": 27017,
        "VpcSecurityGroups": [
                "VpcSecurityGroupId": "sg-77186e0d",
                "Status": "active"
        "StorageEncrypted": false,
        "ClusterCreateTime": "2019-03-15T20:29:58.836Z",
        "MultiAZ": true,
        "Status": "available",
        "DBClusterMembers": [
                "DBClusterParameterGroupStatus": "in-sync",
                "IsClusterWriter": false,
                "DBInstanceIdentifier": "sample-cluster",
                "PromotionTier": 1
                "DBClusterParameterGroupStatus": "in-sync",
                "IsClusterWriter": true,
                "DBInstanceIdentifier": "sample-cluster2",
                "PromotionTier": 2
        "EnabledCloudwatchLogsExports": [
        "DBClusterParameterGroup": "default.docdb3.6",
        "HostedZoneId": "ZNKXH85TT8WVW",
        "DBClusterArn": "arn:aws:rds:us-west-2:123456789012:cluster:sample-cluster",
        "BackupRetentionPeriod": 3,
        "DbClusterResourceId": "cluster-UP4EF2PVDDFVHHDJQTYDAIGHLE",
        "ReaderEndpoint": "",
        "Engine": "docdb"

For more information, see Amazon DocumentDB Failover in the Amazon DocumentDB Developer Guide.


DBCluster -> (structure)

Detailed information about a DB cluster.

AvailabilityZones -> (list)

Provides the list of Amazon EC2 Availability Zones that instances in the DB cluster can be created in.


BackupRetentionPeriod -> (integer)

Specifies the number of days for which automatic DB snapshots are retained.

DBClusterIdentifier -> (string)

Contains a user-supplied DB cluster identifier. This identifier is the unique key that identifies a DB cluster.

DBClusterParameterGroup -> (string)

Specifies the name of the DB cluster parameter group for the DB cluster.

DBSubnetGroup -> (string)

Specifies information on the subnet group that is associated with the DB cluster, including the name, description, and subnets in the subnet group.

Status -> (string)

Specifies the current state of this DB cluster.

PercentProgress -> (string)

Specifies the progress of the operation as a percentage.

EarliestRestorableTime -> (timestamp)

The earliest time to which a database can be restored with point-in-time restore.

Endpoint -> (string)

Specifies the connection endpoint for the primary instance of the DB cluster.

ReaderEndpoint -> (string)

The reader endpoint for the DB cluster. The reader endpoint for a DB cluster load balances connections across the Amazon DocumentDB replicas that are available in a DB cluster. As clients request new connections to the reader endpoint, Amazon DocumentDB distributes the connection requests among the Amazon DocumentDB replicas in the DB cluster. This functionality can help balance your read workload across multiple Amazon DocumentDB replicas in your DB cluster.

If a failover occurs, and the Amazon DocumentDB replica that you are connected to is promoted to be the primary instance, your connection is dropped. To continue sending your read workload to other Amazon DocumentDB replicas in the cluster, you can then reconnect to the reader endpoint.

MultiAZ -> (boolean)

Specifies whether the DB cluster has instances in multiple Availability Zones.

Engine -> (string)

Provides the name of the database engine to be used for this DB cluster.

EngineVersion -> (string)

Indicates the database engine version.

LatestRestorableTime -> (timestamp)

Specifies the latest time to which a database can be restored with point-in-time restore.

Port -> (integer)

Specifies the port that the database engine is listening on.

MasterUsername -> (string)

Contains the master user name for the DB cluster.

PreferredBackupWindow -> (string)

Specifies the daily time range during which automated backups are created if automated backups are enabled, as determined by the BackupRetentionPeriod .

PreferredMaintenanceWindow -> (string)

Specifies the weekly time range during which system maintenance can occur, in Universal Coordinated Time (UTC).

DBClusterMembers -> (list)

Provides the list of instances that make up the DB cluster.


Contains information about an instance that is part of a DB cluster.

DBInstanceIdentifier -> (string)

Specifies the instance identifier for this member of the DB cluster.

IsClusterWriter -> (boolean)

A value that is true if the cluster member is the primary instance for the DB cluster and false otherwise.

DBClusterParameterGroupStatus -> (string)

Specifies the status of the DB cluster parameter group for this member of the DB cluster.

PromotionTier -> (integer)

A value that specifies the order in which an Amazon DocumentDB replica is promoted to the primary instance after a failure of the existing primary instance.

VpcSecurityGroups -> (list)

Provides a list of virtual private cloud (VPC) security groups that the DB cluster belongs to.


Used as a response element for queries on virtual private cloud (VPC) security group membership.

VpcSecurityGroupId -> (string)

The name of the VPC security group.

Status -> (string)

The status of the VPC security group.

HostedZoneId -> (string)

Specifies the ID that Amazon Route 53 assigns when you create a hosted zone.

StorageEncrypted -> (boolean)

Specifies whether the DB cluster is encrypted.

KmsKeyId -> (string)

If StorageEncrypted is true , the AWS KMS key identifier for the encrypted DB cluster.

DbClusterResourceId -> (string)

The AWS Region-unique, immutable identifier for the DB cluster. This identifier is found in AWS CloudTrail log entries whenever the AWS KMS key for the DB cluster is accessed.

DBClusterArn -> (string)

The Amazon Resource Name (ARN) for the DB cluster.

AssociatedRoles -> (list)

Provides a list of the AWS Identity and Access Management (IAM) roles that are associated with the DB cluster. IAM roles that are associated with a DB cluster grant permission for the DB cluster to access other AWS services on your behalf.


Describes an AWS Identity and Access Management (IAM) role that is associated with a DB cluster.

RoleArn -> (string)

The Amazon Resource Name (ARN) of the IAM role that is associated with the DB cluster.

Status -> (string)

Describes the state of association between the IAM role and the DB cluster. The Status property returns one of the following values:

  • ACTIVE - The IAM role ARN is associated with the DB cluster and can be used to access other AWS services on your behalf.
  • PENDING - The IAM role ARN is being associated with the DB cluster.
  • INVALID - The IAM role ARN is associated with the DB cluster, but the DB cluster cannot assume the IAM role to access other AWS services on your behalf.

ClusterCreateTime -> (timestamp)

Specifies the time when the DB cluster was created, in Universal Coordinated Time (UTC).

EnabledCloudwatchLogsExports -> (list)

A list of log types that this DB cluster is configured to export to Amazon CloudWatch Logs.


DeletionProtection -> (boolean)

Specifies whether this cluster can be deleted. If DeletionProtection is enabled, the cluster cannot be deleted unless it is modified and DeletionProtection is disabled. DeletionProtection protects clusters from being accidentally deleted.