Modifies the configurations of a UDP listener.

Debugging

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Request parameters

Parameter Type Required Example Description
Action String Yes SetLoadBalancerUDPListenerAttribute

The operation that you want to perform.

Set the value to SetLoadBalancerUDPListenerAttribute.

ListenerPort Integer Yes 80

The frontend port that is used by the SLB instance.

Valid values: 1 to 65535.

LoadBalancerId String Yes lb-bp1rtfnodmywb43ecu4sf-c****

The ID of the SLB instance.
RegionId String Yes cn-hangzhou

The ID of the region where the SLB instance is created.
Bandwidth Integer No -1

The maximum bandwidth of the listener. Unit: Mbit/s.

Valid values: 1 to 5120 and -1.

  • -1: For a pay-by-data-transfer public-facing SLB instance, you can set the maximum bandwidth to -1. This indicates that the maximum bandwidth is not limited.
  • 1-5120: For a pay-by-bandwidth public-facing SLB instance, you can specify the maximum bandwidth of each listener. The sum of maximum bandwidth values of all listeners cannot exceed the maximum bandwidth of the SLB instance. For more information, see EIP bandwidth plan.
Scheduler String No wrr

The scheduling algorithm. Valid values:

  • wrr: Backend servers that have higher weights receive more requests than those that have lower weights.

  • wlc: Requests are distributed based on the combination of weights and connections to backend servers.

    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: specifies consistent hashing that is based on source IP addresses. Requests from the same source IP address are distributed to the same backend server.
  • tch: specifies consistent hashing that is based on four factors: source IP address, destination IP address, source port number, and destination port number. Requests that contain the same preceding information are distributed to the same backend server.
  • qch: specifies consistent hashing that is based on QUIC connection IDs. Requests that contain the same QUIC connection ID are distributed to the same backend server.
Note Only guaranteed-performance SLB instances support sch, tch, and qch.
HealthyThreshold Integer No 4

The number of consecutive successful health checks that must occur before a backend server is declared healthy (from fail to success).

Valid values: 2 to 10.

UnhealthyThreshold Integer No 4

The number of consecutive failed health checks that must occur before a backend server is declared unhealthy. (from success to fail).

Valid values: 2 to 10.

HealthCheckConnectTimeout Integer No 100

The time period to wait for a health check response. If a backend server does not respond within the specified time period, the health check fails.

Valid values: 1 to 300 . Unit: seconds.

Note If the value of the HealthCheckConnectTimeout parameter is smaller than that of the HealthCheckInterval parameter, the value of the HealthCheckConnectTimeout parameter is ignored and the value of the HealthCheckInterval parameter is regarded as the waiting period.
HealthCheckConnectPort Integer No 80

The port that is used for health checks.

Valid values: 1 to 65535.

HealthCheckInterval Integer No 5

The interval between two consecutive health checks.

Valid values: 1 to 50. Unit: seconds.

healthCheckReq String No hello

The request string for UDP listener health checks. The string must be 1 to 500 characters in length and can contain only letters and digits.

healthCheckExp String No ok

The response string for UDP listener health checks. The string must be 1 to 500 characters in length and can contain only letters and digits.

VServerGroup String No on

Specifies whether to use a VServer group.

Valid values: on and off.

Note The value of VserverGroup and the value of MasterSlaveServerGroup cannot be set to on at the same time.
VServerGroupId String No rsp-cige6******

The ID of the VServer group.
MasterSlaveServerGroupId String No rsp-0bfuc*****

The ID of the primary/secondary server group.

Note You cannot specify the VServer group ID and primary/secondary server group ID at the same time.
MasterSlaveServerGroup String No on

Specifies whether to use a primary/secondary server group.

Valid values: on and off.

The value of VserverGroup and the value of MasterSlaveServerGroup cannot be set to on at the same time.

AclId String No off

The ID of the access control list (ACL) to which the listener is bound.

This parameter is required when the AclStatus parameter is set to on.

AclType String No white

The type of ACL. Valid values: white and black.

  • white: specifies the ACL as a whitelist. Only requests from the IP addresses or CIDR blocks in the ACL are forwarded. Whitelists apply to scenarios that require you to allow only specific IP addresses to access an application.

    Risks may arise if you specify the ACL as a whitelist.

    The whitelist allows only network traffic from the IP addresses in the specified ACL to access the SLB listener.

    If a whitelist is enabled without any IP addresses specified, the SLB listener does not forward any requests.

  • black: specifies the ACL as a blacklist. All requests from the IP addresses or CIDR blocks in the ACL are rejected. Blacklists apply to scenarios that require you to block access from specific IP addresses to an application.

    If the blacklist is enabled but the corresponding ACL does not contain any IP addresses, the SLB listener forwards all requests.

Note This parameter takes effect when the AclStatus parameter is set to on.
AclStatus String No off

Specifies whether to enable the access control feature.

Valid values: on and off.

Description String No test

The description of the listener.

Response parameters

Parameter Type Example Description
RequestId String CEF72CEB-54B6-4AE8-B225-F876FF7BA984

The ID of the request.

Examples

Sample requests

http(s)://[Endpoint]/? Action=SetLoadBalancerUDPListenerAttribute
&ListenerPort=80
&LoadBalancerId=lb-bp1rtfnodmywb43ecu4sf-c****
&<Common request parameters>

Sample success responses

XML format 

<SetLoadBalancerUDPListenerAttributeResponse>
     <RequestId>A0F0643E-D653-4F6F-A67F-205B2A92BE18</RequestId>
</SetLoadBalancerUDPListenerAttributeResponse>

JSON format 

{
    "RequestId": "A0F0643E-D653-4F6F-A67F-205B2A92BE18"
}

Error codes

For a list of error codes, visit the API Error Center.