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User Guide

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[ aws . rds ]



Modifies an existing DB subnet group. DB subnet groups must contain at least one subnet in at least two AZs in the Amazon Web Services Region.

See also: AWS API Documentation

See 'aws help' for descriptions of global parameters.


--db-subnet-group-name <value>
[--db-subnet-group-description <value>]
--subnet-ids <value>
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]


--db-subnet-group-name (string)

The name for the DB subnet group. This value is stored as a lowercase string. You can't modify the default subnet group.

Constraints: Must match the name of an existing DBSubnetGroup. Must not be default.

Example: mySubnetgroup

--db-subnet-group-description (string)

The description for the DB subnet group.

--subnet-ids (list)

The EC2 subnet IDs for the DB subnet group.



"string" "string" ...

--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 modify a DB subnet group

The following modify-db-subnet-group example adds a subnet with the ID subnet-08e41f9e230222222 to the DB subnet group named mysubnetgroup. To keep the existing subnets in the subnet group, include their IDs as values in the --subnet-ids option. Make sure to have subnets with at least two different Availability Zones in the DB subnet group.

aws rds modify-db-subnet-group \
    --db-subnet-group-name mysubnetgroup \
    --subnet-ids '["subnet-0a1dc4e1a6f123456","subnet-070dd7ecb3aaaaaaa","subnet-00f5b198bc0abcdef","subnet-08e41f9e230222222"]'


    "DBSubnetGroup": {
        "DBSubnetGroupName": "mysubnetgroup",
        "DBSubnetGroupDescription": "test DB subnet group",
        "VpcId": "vpc-0f08e7610a1b2c3d4",
        "SubnetGroupStatus": "Complete",
        "Subnets": [
                "SubnetIdentifier": "subnet-08e41f9e230222222",
                "SubnetAvailabilityZone": {
                    "Name": "us-west-2a"
                "SubnetStatus": "Active"
                "SubnetIdentifier": "subnet-070dd7ecb3aaaaaaa",
                "SubnetAvailabilityZone": {
                    "Name": "us-west-2b"
                "SubnetStatus": "Active"
                "SubnetIdentifier": "subnet-00f5b198bc0abcdef",
                "SubnetAvailabilityZone": {
                    "Name": "us-west-2d"
                "SubnetStatus": "Active"
                "SubnetIdentifier": "subnet-0a1dc4e1a6f123456",
                "SubnetAvailabilityZone": {
                    "Name": "us-west-2b"
                "SubnetStatus": "Active"
        "DBSubnetGroupArn": "arn:aws:rds:us-west-2:534026745191:subgrp:mysubnetgroup"

For more information, see Step 3: Create a DB Subnet Group in the Amazon RDS User Guide.


DBSubnetGroup -> (structure)

Contains the details of an Amazon RDS DB subnet group.

This data type is used as a response element in the DescribeDBSubnetGroups action.

DBSubnetGroupName -> (string)

The name of the DB subnet group.

DBSubnetGroupDescription -> (string)

Provides the description of the DB subnet group.

VpcId -> (string)

Provides the VpcId of the DB subnet group.

SubnetGroupStatus -> (string)

Provides the status of the DB subnet group.

Subnets -> (list)

Contains a list of Subnet elements.


This data type is used as a response element for the DescribeDBSubnetGroups operation.

SubnetIdentifier -> (string)

The identifier of the subnet.

SubnetAvailabilityZone -> (structure)

Contains Availability Zone information.

This data type is used as an element in the OrderableDBInstanceOption data type.

Name -> (string)

The name of the Availability Zone.

SubnetOutpost -> (structure)

If the subnet is associated with an Outpost, this value specifies the Outpost.

For more information about RDS on Outposts, see Amazon RDS on Amazon Web Services Outposts in the Amazon RDS User Guide.

Arn -> (string)

The Amazon Resource Name (ARN) of the Outpost.

SubnetStatus -> (string)

The status of the subnet.

DBSubnetGroupArn -> (string)

The Amazon Resource Name (ARN) for the DB subnet group.