Use DescribeLoadBalancerUDPListenerAttribute to query UDP listener configuration - ENS

Queries the configuration of a User Datagram Protocol (UDP) listener.

Operation description

up to 100 times per second per account.
up to 10 times per second per user.

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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

ens:DescribeLoadBalancerUDPListenerAttribute

get

*All Resource

*

None

Request parameters

Parameter	Type	Required	Description	Example
ListenerPort	integer	Yes	The listening port that you want to query. Valid values: 1 to 65535.	80
LoadBalancerId	string	Yes	The ID of the ELB instance.	lb-5pzipr2fszqtl2xf64uy5****

Response elements

Element	Type	Description	Example
	object	Schema of Response
RequestId	string	The ID of the request.	5D7597CF-1630-54EC-A945-624A33F2E7E8
ListenerPort	integer	The listener port.	80
Status	string	The status of the listener. Valid values: Running Stopped Starting Configuring Stopping	Stopped
Bandwidth	integer	The peak bandwidth of the Edge Load Balancer (ELB) instance. The default value is -1, which indicates that the bandwidth is not limited.	5
Scheduler	string	The routing algorithm. Valid values: wrr: Backend servers with higher weights receive more requests than those with lower weights. wlc: Requests are distributed based on the weight and load of each backend server. The load refers to the number of connections to a backend server. If two backend servers have the same weight, the backend server that has fewer connections receives more requests. rr: Requests are distributed to backend servers in sequence. sch: consistent hashing that is based on source IP addresses. Requests from the same source IP address are distributed to the same backend server. qch: consistent hashing that is based on QUIC connection IDs. Requests that contain the same QUIC connection ID are distributed to the same backend server. iqch: consistent hashing that is based on specific three bytes of the iQUIC CIDs. Requests whose second to fourth bytes are the same are distributed to the same backend server.	wrr
HealthCheck	string	Specifies whether to enable the health check feature. Valid values: on off	on
HealthyThreshold	integer	The number of consecutive successful health checks that must occur before an unhealthy and inaccessible backend server is declared healthy and accessible. Valid values: 2 to 10. Note This parameter takes effect only if you set HealthCheck to on.	4
UnhealthyThreshold	integer	The number of consecutive failed health checks that must occur before a healthy and accessible backend server is declared unhealthy and inaccessible. Valid values: 2 to 10. Note This parameter takes effect only if you set HealthCheck to on.	4
HealthCheckConnectTimeout	integer	The timeout period for a health check response. If a backend server does not respond within the specified timeout period, the server fails the health check. Default value: 5. Valid values: 1 to 300. Unit: seconds. Note This parameter takes effect only if the HealthCheck parameter is set to on. If the value of the HealthCheckTimeout property is smaller than the value of the HealthCheckInterval property, the timeout period specified by the HealthCheckTimeout property becomes invalid and the value of the HealthCheckInterval property is used as the timeout period.	100
HealthCheckInterval	integer	The interval at which health checks are performed. Valid values: 1 to 50. Unit: seconds. Note This parameter takes effect only if you set HealthCheck to on.	5
Description	string	The name of the listener.	example
BackendServerPort	integer	The port used by the backend ELB server of the ELB instance. Valid values: 1 to 65535.	8080
HealthCheckConnectPort	integer	The port that is used for health checks. Valid values: 1 to 65535. If you leave this parameter empty, the port specified by BackendServerPort is used for health checks.	8000
HealthCheckReq	string	The request string for UDP listener health checks. The string can be up to 64 characters in length and can contain only letters and digits.	hello
HealthCheckExp	string	The response string for UDP listener health checks. The string can be up to 64 characters in length and can contain only letters and digits.	ok
EipTransmit	string	Indicates whether EIP pass-through is enabled. Valid values: on off (default)	on
EstablishedTimeout	integer	The timeout period of a connection. Valid values: 10 to 900. Unit: seconds.	500

Examples

Success response

JSON format

{
  "RequestId": "5D7597CF-1630-54EC-A945-624A33F2E7E8",
  "ListenerPort": 80,
  "Status": "Stopped",
  "Bandwidth": 5,
  "Scheduler": "wrr",
  "HealthCheck": "on",
  "HealthyThreshold": 4,
  "UnhealthyThreshold": 4,
  "HealthCheckConnectTimeout": 100,
  "HealthCheckInterval": 5,
  "Description": "example",
  "BackendServerPort": 8080,
  "HealthCheckConnectPort": 8000,
  "HealthCheckReq": "hello",
  "HealthCheckExp": "ok",
  "EipTransmit": "on",
  "EstablishedTimeout": 500
}

Error codes

HTTP status code	Error code	Error message	Description
400	ListenerNotFound	Listener is not found.	Listener does not exist
400	LoadBalancerNotFound	The input parameter LoadBalancerId that is not found.	The load balancing instance does not exist.
400	ens.interface.error	Failed to call API.
400	NoPermission	Permission denied.
400	InvalidParameter.%s	The specified field %s invalid. Please check it again.

See Error Codes for a complete list.

Release notes

See Release Notes for a complete list.