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ApsaraDB RDS:AllocateInstancePublicConnection

Last Updated:Aug 17, 2026

Applies for a public endpoint for an ApsaraDB RDS instance.

Operation description

Supported engines

  • RDS MySQL

  • RDS PostgreSQL

  • RDS SQL Server

  • RDS MariaDB

Related documentation

Important Before you call this operation, read the following documentation and make sure that you fully understand the prerequisites and impacts of this operation.

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Test

RAM authorization

The table below describes the authorization required to call this API. You can define it in a Resource Access Management (RAM) policy. The table's columns are detailed below:

  • Action: The actions can be used in the Action element of RAM permission policy statements to grant permissions to perform the operation.

  • API: The API that you can call to perform the action.

  • Access level: The predefined level of access granted for each API. Valid values: create, list, get, update, and delete.

  • Resource type: The type of the resource that supports authorization to perform the action. It indicates if the action supports resource-level permission. The specified resource must be compatible with the action. Otherwise, the policy will be ineffective.

    • For APIs with resource-level permissions, required resource types are marked with an asterisk (*). Specify the corresponding Alibaba Cloud Resource Name (ARN) in the Resource element of the policy.

    • For APIs without resource-level permissions, it is shown as All Resources. Use an asterisk (*) in the Resource element of the policy.

  • Condition key: The condition keys defined by the service. The key allows for granular control, applying to either actions alone or actions associated with specific resources. In addition to service-specific condition keys, Alibaba Cloud provides a set of common condition keys applicable across all RAM-supported services.

  • Dependent action: The dependent actions required to run the action. To complete the action, the RAM user or the RAM role must have the permissions to perform all dependent actions.

Action

Access level

Resource type

Condition key

Dependent action

rds:AllocateInstancePublicConnection

update

*DBInstance

acs:rds:{#regionId}:{#accountId}:dbinstance/{#dbinstanceId}

  • rds:ResourceTag
  • rds:ResourceTag
  • rds:ResourceTag
None

Request parameters

Parameter

Type

Required

Description

Example

DBInstanceId

string

Yes

The instance ID. You can call DescribeDBInstances to obtain the instance ID.

rm-uf6wjk5****

ConnectionStringPrefix

string

Yes

The prefix of the public endpoint. The complete public endpoint is in the format of prefix.engine.rds.aliyuncs.com. Example: test1234.mysql.rds.aliyuncs.com.

Note

The prefix must be 5 to 40 characters in length and cannot contain Chinese characters or special characters (~!#%^&*=+|{};:'",<>/?). The prefix can contain letters, digits, and hyphens (-).

test1234

Port

string

Yes

The public port. Valid values: 1000 to 5999.

3306

BabelfishPort

string

No

The TDS port number of Babelfish for RDS PostgreSQL.

Note

This parameter is applicable only to ApsaraDB RDS for PostgreSQL instances. For more information about Babelfish for RDS PostgreSQL, see Introduction to Babelfish.

1433

GeneralGroupName

string

No

The name of the dedicated cluster group to which the general-purpose ApsaraDB RDS for MySQL instance belongs.

rgc-bp1tkv8****

PGBouncerPort

string

No

The PgBouncer port.

6432

Response elements

Element

Type

Description

Example

object

The response parameters.

ConnectionString

string

The database endpoint.

test****.mysql.rds.aliyuncs.com

DbInstanceName

string

The instance ID.

rm-bp1****

RequestId

string

The request ID.

65BDA532-28AF-4122-AA39-B382721EEE64

Examples

Success response

JSON format

{
  "ConnectionString": "test****.mysql.rds.aliyuncs.com",
  "DbInstanceName": "rm-bp1****",
  "RequestId": "65BDA532-28AF-4122-AA39-B382721EEE64"
}

Error codes

HTTP status code

Error code

Error message

Description

400 OtherEndpoint.Exist Other endpoint exist. The prefix of the connection address already exists
400 IncorrectDBInstanceState The current instance state does not support this operation. The operation is not supported. The RDS instance is not in a ready state.
400 ConnectionStringContainIllegalCharacterFault The connection string contain Illegal character. The endpoint contains invalid characters. Modify the endpoint and try again.
400 InvalidInstanceNetworkType The specified InstanceNetworkType is invalid. The specified InstanceNetworkType is invalid.
400 InvalidConnectionString.Format Specified connection string is not valid. The endpoint of the RDS instance is invalid. The prefix of the endpoint must be 5 to 40 characters in length.
400 InvalidPort.Malformed Specified port is not valid. The port number is invalid.
400 InvalidVpcIdRegion.NotSupported The specified region does not allow you to create a VPC instance. The operation failed. The current region does not support creating instances that use the VPC network type. Create a VPC in a supported region.
400 InvalidInstanceNetworkType.ValueNotSupported The specified parameter "InstanceNetworkType" is not valid. The network type failed the verification check. The supported network types are VPC and classic network.
400 InvalidBizType.Format Specified biz type is not valid. The current business type does not support this operation.
400 EndpointNum.Error The number of endpoint is too many. The number of endpoints has reached the upper limit. No more endpoints can be created.
400 EndpointType.NotSupport Current db type is not support specified endpoint type. The specified endpoint type is invalid.
400 Order.ComboInstanceNotAllowOperate A package instance is not allowed to operate independently. A package instance is not allowed to operate independently.
400 Price.PricingPlanResultNotFound Pricing plan price result not found. Pricing plan price result not found.
400 Order.NoRealNameAuthentication You have not passed the real-name authentication and do not meet the purchase conditions. Please log in to the user center for real-name authentication. You have not passed the real-name authentication and do not meet the purchase conditions. Please log in to the cost and cost for real-name authentication.
400 InsufficientAvailableQuota Your account quota limit is less than 0, please recharge before trying to purchase. Your account available limit is less than 0, please recharge before trying to purchase.
400 CommodityServiceCalling.Exception Failed to call commodity service. Failed to call commodity service return.
400 RegionDissolvedEOM Dear customer, Alibaba Cloud plans to optimize and adjust the current region. Cloud services in this region will cease operations. You are currently unable to operate new purchase orders. Thank you for your understanding and support. Hello, Alibaba Cloud plans to optimize and adjust the current region. Cloud services in this region will stop operating. In order to ensure your business continuity and smooth transition of data migration, you are currently unable to operate new purchase orders. Thank you for your understanding and support.
400 Commodity.InvalidComponent The module you purchased is not legal, please buy it again. The module you purchased is not legal, please buy it again.
400 RegionEndTimeDissolvedAustralia Cloud services in the Australia (Sydney) region will be discontinued. Set the validity date to September 30, 2024 or earlier than September 30, 2024. Hello customer, this area has been abolished.
400 Price.CommoditySys Commodity system call exception. Commodity system call exception.
400 Pay.InsufficientBalance Insufficient available balance. Insufficient available balance.
400 Order.PeriodInvalid There is a problem with the period you selected, please choose again. There is a problem with the period you selected, please choose again.
400 pay.noCreditCard Account not bound to credit card. No credit card is available.
400 Order.InstHasUnpaidOrder There is an unpaid order for the service you have purchased. Please pay or void it before placing the order. There is an unpaid order for the service you have purchased. Please pay or void it before placing the order.
400 noAvailablePaymentMethod No payment method is specified for your account. We recommend that you add a payment method. No payment method has been specified for your account. We recommend that you add a payment method.
400 BasicInfoUncompleted Your information is incomplete. Complete your information before the operation. Your basic information is not complete, please complete your basic information before operation.
400 Risk.RiskControlRejection Your account is abnormal, please contact customer service for details. Your account is abnormal, please contact customer service for details.
400 Api.NotSupport Specified api is not supported. The current interface does not support.
400 ContainForbiddenLabelError There is a label that prohibits placing orders. Please contact your distributor for assistance. You cannot place the order because a tag indicates that order placement is prohibited. Contact your distributor.
400 InvalidDBInstanceId.NotFound The DBInstanceId provided does not exist in records. The DBInstanceId provided does not exist.
400 InvalidInstanceLevel.DiskType Specified instance level not support request disk type The current instance type does not support the specified storage type.
400 InvalidParam Sepcified wal level Parameter is invalid. There are still logical slots in instance, so it can not be set as replica. The specified wal_level parameter is invalid. There is still a copy slot in the instance, so it cannot be set to replica.
400 KmsApiError User secret key invalid. The user key is invalid.
400 System.SaleValidateFailed Sales expression validation system error. A system error occurs when the sales expression is verified.
400 Abs.InvalidAccount.NotFound account is not found. The account does not exist.
400 SqlExecuteFailedOrTimeout sql command execution failed or timed out:%s. SQL command execution failed or timed out
400 ColdData.EngineVersionNotSupport The current instance engine version not support coldDataEnabled. The current instance engine version not support coldDataEnabled.
400 ColdData.MinorVersionNotSupport The current instance minor version not support coldDataEnabled. The current instance minor version not support coldDataEnabled.
400 IncorrectTargetClasscode The current instance type does not support this operation. This operation is not supported by the instance type.
400 InvalidConnectionString.Duplicate Specified connection string already exists in the RDS. The link address name is duplicate. Please reset the connection string.
400 RequiredParam.NotFound Required input param is not found. Required parameters are missing.
400 Parameters.Invalid Parameter error, please check the parameters. Parameter error, please check the parameters.
400 BackupPolicyNotSupport Cold Data won't open with CrossBackup or Flash Backup, please check Backup Policy. Cold Data won't open with CrossBackup or Flash Backup, please check Backup Policy.
400 InvalideStatus.Format The instance status does not support this operation. The instance status does not support this operation.
400 InvalidReleasedKeepPolicy.Format Specified Released Keep Policy is not valid. Specified Released Keep Policy is not valid.
400 InvalidDBInstanceEngineType.Format the DB instance engine type does not support this operation. This operation is not supported for the database engine of the instance.
400 Pay.NoCreditCard No credit cards. No credit cards.
400 VpcNetworkTypeNotSupport The vpc network type instance does not support this operation. The vpc network type instance does not support this operation.
400 MirrorInsExists Specified DB instance mirror ins already existed. Specified DB instance mirror ins already existed.
400 UnsupportedClassCode The specified DB instance class stops selling. The specified DB instance class stops selling.
400 InvalidBackupSet The specified database does not exist in the backup set. The specified database does not exist in the backup set.
400 OrdTCommodityQueryError Failed to query for product. Failed to query product.
400 ProductInstanceReleased The instance has been released. Please check before placing the order. The instance has been released, please verify and place an order.
400 RegionEndTimeDissolvedIndia The region is no longer supported. The region is no longer supported.
400 NetworkConnectionCreating The existing network connection is already being created, please do not create it repeatedly. An existing network connection has already been created, please do not create it again.
500 ExternalFailure The request processing has failed due to external service failure. The request processing has failed due to external service failure.
500 RequestMetaDataFailed The service request failed. Please try again later or contact service personnel. The service request failed. Please try again later or contact service personnel.
500 InvokeProxyFailure The request processing has failed due to service failure of rds api. The request failed to be processed due to an RDS API failure.
403 Invalid.DbInstanceNetType The specified parameter DbInstanceNetType is not valid. The network type of the RDS instance is invalid. Set the network type to Internet or Intranet.
403 OperationDenied.SwitchToVPC Specified instance cannot be switched to VPC. The network type of the RDS instance cannot be changed to VPC.
403 OrderStatus.UnPaid The specified db instance has unpaid order. The instance has an unpaid order. Please pay first and try again.
403 InvalidReduceDiskSize The storage capacity after the scale-down must be larger than the used amount. The scale-in target capacity cannot be less than the current storage space usage
403 CloudSSDNotSupport Cloud ssd does not support this operation, please upgrade to essd. SSD disks do not support this operation. Upgrade to ESSD.
403 InvalidUserOperatorPermission The user permission does not support this operation. The user is not authorized to perform this operation.
403 InvalidVswitchId Specified conn vswitch id is not valid. The specified VSwitchId is in an incorrect format or is empty.
403 IncorrectMinorVersion Current engine minor version does not support operations. This operation is not supported for the current minor engine version.
403 OperationDenied.ZoneResource There is no available zone for inventory. There is no available zone for inventory.
403 NotInFlowController Sorry,no permission. Sorry,no permission.
403 InvalidKmsKey Kms key is disabled. The KMS key is disabled.
403 InvalidInstanceLevel.Malformed Current DB instance level does not support this operation. The specified database instance type does not support this operation.
403 UnsupportedByBlueGreenDeployment Operation prohibited due to blue green deployment. The operation is not allowed because a blue-green deployment exists.
403 GuardDBInstanceNotSupport Guard instance does not support this operation. This operation is not supported for disaster recovery instances.
404 InvalidConnectionString.Duplicate Specified connection string already exists in the Aliyun RDS. The endpoint is duplicate. Specify a different endpoint.
404 InvalidClusterKms The current instance does not authorized to access the Key Management Service. The instance does not have permissions to access Key Management Service (KMS).
404 Request.NotFound The requested resource is not available. The requested resources are unavailable.
404 HostInfo.NotFound The specified host info is not found. The specified host information does not exist.

See Error Codes for a complete list.

Release notes

See Release Notes for a complete list.