RemoveBackendServers - Server Load Balancer - Alibaba Cloud Documentation Center

Removes backend servers.

Operation description

Note If the backend servers that you want to remove are not in the server list of the Classic Load Balancer (CLB) instance, the request fails. However, the system does not report an error.

Debugging

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Debug

Authorization information

The following table shows the authorization information corresponding to the API. The authorization information can be used in the Action policy element to grant a RAM user or RAM role the permissions to call this API operation. Description:

Operation: the value that you can use in the Action element to specify the operation on a resource.
Access level: the access level of each operation. The levels are read, write, and list.
Resource type: the type of the resource on which you can authorize the RAM user or the RAM role to perform the operation. Take note of the following items:
- The required resource types are displayed in bold characters.
- If the permissions cannot be granted at the resource level, All Resources is used in the Resource type column of the operation.
Condition Key: the condition key that is defined by the cloud service.
Associated operation: other operations that the RAM user or the RAM role must have permissions to perform to complete the operation. To complete the operation, the RAM user or the RAM role must have the permissions to perform the associated operations.

Operation	Access level	Resource type	Condition key	Associated operation
slb:RemoveBackendServers	update	loadbalancer acs:slb:{#regionId}:{#accountId}:loadbalancer/{#loadbalancerId}	ecs:tag slb:tag	none

Request parameters

Parameter	Type	Required	Description	Example
RegionId	string	No	The ID of the region where the CLB instance is deployed.	cn-hangzhou
LoadBalancerId	string	Yes	The ID of the CLB instance.	lb-bp15lbk8uja8rvm4a****
BackendServers	string	Yes	The backend servers that you want to remove. ServerId: The IDs of the backend servers. Set the value to a string. This parameter is required. Type: the type of the backend server. Valid values: ecs (default): Elastic Compute Service (ECS) instance eni: elastic network interface (ENI) eci: elastic container instance Weight: the weight of the backend server. Valid values: 0 to 100. Set the value to an integer. You can specify at most 20 backend servers in each call. Examples: Remove ECS instances: `[{"ServerId":"i-bp1fq61enf4loa5i**", "Type": "ecs","Weight":"100"}]` Remove ENIs: `[{"ServerId":"eni-2ze1sdp5","Type": "eni","Weight":"100"}]` Remove elastic container instances: `[{"ServerId":"eci-2ze1sdp5**","Type": "eci","Weight":"100"}]`	[{"ServerId":"i-bp1fq61enf4loa5i****", "Type": "ecs","Weight":"100"}]

Response parameters

Parameter	Type	Description	Example
	object
LoadBalancerId	string	The ID of the CLB instance.	lb-bp15lbk8uja8rvm4a****
RequestId	string	The request ID.	365F4154-92F6-4AE4-92F8-7FF34B540710
BackendServers	array<object>	The backend servers.
BackendServer	object
Type	string	The type of backend server. Valid values: ecs: ECS instance eni: ENI eci: elastic container instances	ecs
Weight	integer	The weight of the backend server. Valid values: 0 to 100.	100
Description	string	The description of the server group.	BackendServer1
ServerId	string	The ID of the backend server.	i-bp1fq61enf4loa5i****

Examples

Sample success responses

JSONformat

{
  "LoadBalancerId": "lb-bp15lbk8uja8rvm4a****",
  "RequestId": "365F4154-92F6-4AE4-92F8-7FF34B540710",
  "BackendServers": {
    "BackendServer": [
      {
        "Type": "ecs",
        "Weight": 100,
        "Description": "BackendServer1",
        "ServerId": "i-bp1fq61enf4loa5i****"
      }
    ]
  }
}

Error codes

HTTP status code	Error code	Error message	Description
400	SystemBusy	The system is busy.	The service is unavailable. Please try again later.

For a list of error codes, visit the Service error codes.

Change history

Change time	Summary of changes	Operation
2023-12-13	The Error code has changed	View Change Details