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    Server Load Balancer:UpdateServerGroupAttribute

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    Server Load Balancer:UpdateServerGroupAttribute

    Last Updated:Apr 17, 2025

    Modifies the configurations of a Network Load Balancer (NLB) server group.

    Debugging

    You can run this interface directly in OpenAPI Explorer, saving you the trouble of calculating signatures. After running successfully, OpenAPI Explorer can automatically generate SDK code samples.

    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:
      • For mandatory resource types, indicate with a prefix of * .
      • 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.
    OperationAccess levelResource typeCondition keyAssociated operation
    nlb:UpdateServerGroupAttributeupdate
    *ServerGroup
    acs:nlb:{#regionId}:{#accountId}:servergroup/{#ServerGroupId}
      none
    		none

    Request parameters

    ParameterTypeRequiredDescriptionExample
    ServerGroupIdstringYes

    The server group ID.

    		sgp-atstuj3rtoptyui****
    ServerGroupNamestringNo

    The new name of the server group.

    The name must be 2 to 128 characters in length, can contain digits, periods (.), underscores (_), and hyphens (-), and must start with a letter.

    		NLB_ServerGroup1
    ConnectionDrainEnabledbooleanNo

    Specifies whether to enable connection draining. Valid values:

    • true
    • false
    		false
    ConnectionDrainTimeoutintegerNo

    Specify a timeout period for connection draining. Unit: seconds. Valid values: 0 to 900.

    		10
    SchedulerstringNo

    The scheduling algorithm. Valid values:

    • Wrr: weighted round-robin. Backend servers with higher weights receive more requests.
    • Wlc: weighted least connections. Requests are distributed based on the weight and load of each backend server. The load refers to the number of connections on a backend server. If multiple backend servers have the same weight, requests are forwarded to the backend server with the least connections.
    • rr: Requests are forwarded to backend servers in sequence.
    • sch: source IP hash. Requests from the same source IP address are forwarded to the same backend server.
    • tch: consistent hashing based on four factors: source IP address, destination IP address, source port, and destination port. Requests that contain the same four factors are forwarded to the same backend server.
    • qch: QUIC ID hash. Requests that contain the same QUIC ID are forwarded to the same backend server.
    Note QUIC ID hash is supported only when the backend protocol is set to UDP.
    		Wrr
    PreserveClientIpEnabledbooleanNo

    Specifies whether to enable client IP preservation. Valid values:

    • true
    • false
    Note You cannot set this parameter to true if PreserveClientIpEnabled is set to false and the server group is associated with a listener that uses SSL over TCP.
    		false
    HealthCheckConfigobjectNo

    Health check configurations.

    HealthCheckEnabledbooleanNo

    Specifies whether to enable health checks. Valid values:

    • true
    • false
    		false
    HealthCheckTypestringNo

    The protocol that is used for health checks. Valid values:

    • TCP
    • HTTP
    • UDP
    		TCP
    HealthCheckConnectPortintegerNo

    The backend port that is used for health checks. Valid values: 0 to 65535. If you set this parameter to 0, the port that the backend server uses to provide services is also used for health checks.

    		0
    HealthyThresholdintegerNo

    The number of times that an unhealthy backend server must consecutively pass health checks before it is declared healthy. In this case, the health status changes from fail to success. Valid values: 2 to 10.

    		3
    UnhealthyThresholdintegerNo

    The number of times that a healthy backend server must consecutively fail health checks before it is declared unhealthy. In this case, the health status changes from success to fail. Valid values: 2 to 10.

    		3
    HealthCheckConnectTimeoutintegerNo

    The timeout period for a health check response. Unit: seconds. Valid values: 1 to 300. Default value: 5.

    		100
    HealthCheckIntervalintegerNo

    The interval at which health checks are performed. Unit: seconds. Default value: 5.

    • If you set HealthCheckType to TCP or HTTP, valid values are 1 to 50.
    • If you set HealthCheckType to UDP, valid values are 1 to 300. Set the health check interval equal to or larger than the response timeout period to ensure that UDP response timeouts are not determined as no responses.
    		5
    HealthCheckDomainstringNo

    The domain name used for health checks. Valid values:

    • $SERVER_IP: the internal IP address of a backend server.
    • domain: the specified domain name. The domain name must be 1 to 80 characters in length, and can contain lowercase letters, digits, hyphens (-), and periods (.).
    Note This parameter takes effect only if you set HealthCheckType to HTTP.
    		$SERVER_IP
    HealthCheckUrlstringNo

    The path to which health check probes are sent.

    The path must be 1 to 80 characters in length and can contain only letters, digits, and the following special characters: - / . % ? # & =. It can also contain the following extended characters: _ ; ~ ! ( ) * [ ] @ $ ^ : ' , +. It must start with a forward slash (/).

    Note This parameter takes effect only if you set HealthCheckType to HTTP.
    		/test/index.html
    HealthCheckHttpCodearrayNo

    The HTTP status codes to return for health checks. Separate multiple HTTP status codes with commas (,). Valid values: http_2xx (default), http_3xx, http_4xx, and http_5xx.

    Note This parameter takes effect only if you set HealthCheckType to HTTP.
    HealthCheckHttpCodestringNo

    The HTTP status codes to return for health checks. Separate multiple HTTP status codes with commas (,). Valid values: http_2xx (default), http_3xx, http_4xx, and http_5xx.

    Note This parameter takes effect only if you set HealthCheckType to HTTP.
    		http_2xx
    HttpCheckMethodstringNo

    The HTTP method used for health checks. Valid values: GET and HEAD.

    Note This parameter takes effect only if you set HealthCheckType to HTTP.
    		GET
    HealthCheckReqstringNo

    The request string of UDP health checks. The string must be 1 to 512 characters in length, and can contain letters and digits.

    		hello
    HealthCheckExpstringNo

    The response string of UDP health checks. The string must be 1 to 512 characters in length, and can contain letters and digits.

    		ok
    HealthCheckHttpVersionstringNo

    The version of the HTTP protocol. Valid values: HTTP1.0 and HTTP1.1.

    Note This parameter takes effect only if you set HealthCheckType to HTTP.
    		HTTP1.0
    RegionIdstringNo

    The ID of the region where the NLB instance is deployed.

    You can call the DescribeRegions operation to query the most recent region list.

    		cn-hangzhou
    DryRunbooleanNo

    Specifies whether to perform a dry run. Valid values:

    • true: validates the request without performing the operation. The system checks the request for potential issues, including missing parameter values, incorrect request syntax, and service limits. If the request fails the validation, the corresponding error message is returned. If the request passes the validation, the DryRunOperation error code is returned.
    • false (default): validates the request and performs the operation. If the request passes the validation, a 2xx HTTP status code is returned and the operation is performed.
    		false
    ClientTokenstringNo

    The client token used to ensure the idempotence of the request.

    You can use the client to generate the token. Ensure that the token is unique among different requests. Only ASCII characters are allowed.

    Note If you do not specify this parameter, the value of RequestId is used.**** The value of RequestId is different for each request.
    		123e4567-e89b-12d3-a456-426655440000

    Response parameters

    ParameterTypeDescriptionExample
    object

    Updates the configuration of a server group.

    RequestIdstring

    The request ID.

    		54B48E3D-DF70-471B-AA93-08E683A1B45
    ServerGroupIdstring

    The server group ID.

    		sgp-atstuj3rtoptyui****
    JobIdstring

    The ID of the asynchronous task.

    		72dcd26b-f12d-4c27-b3af-18f6aed5****

    Examples

    Sample success responses

    JSONformat

    {
  "RequestId": "54B48E3D-DF70-471B-AA93-08E683A1B45",
  "ServerGroupId": "sgp-atstuj3rtoptyui****",
  "JobId": "72dcd26b-f12d-4c27-b3af-18f6aed5****"
}

    Error codes

    HTTP status codeError codeError messageDescription
    400IllegalParam.%sThe param of %s is illegal.-
    400SystemBusySystem is busy, please try again later.-
    400IllegalParam.healthCheckDomainThe parameter of healthCheckConfig.healthCheckDomain is illegal.The healthCheckDomain in the health check configuration is invalid. Check the input parameters.
    400IlleagalParam.healthCheckUrlThe parameter of healthCheckUrl in healthCheckConfig is illegal.The URL of the health check used in the health check setting is invalid.
    400OperationDenied.UidNotAllowQuic29The operation is not allowed because of uid not allow quic29 version.-
    400IllegalParamThe param of %s is illegal.-
    400DryRunOperationRequest validation has been passed with DryRun flag set.Request validation has been passed with DryRun flag set.
    400IllegalParam.ServerGroupNameThe param of ServerGroupName is illegal.-
    400IllegalParam.PreserveClientIpSwitchThe server group associated with the tcpssl listener does not support enabling PreserveClientIp.The server group associated with the tcpssl listener does not support enabling PreserveClientIp.
    403Forbidden.NoPermissionAuthentication is failed for NoPermission.Authentication is failed for NoPermission.
    404ResourceNotFound.serverGroupThe specified resource of serverGroup is not found.The specified resource of serverGroup is not found. Please check the input parameters.

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

    Change history

    Change timeSummary of changesOperation
    2024-06-25The Error code has changedView Change Details
    2024-03-14The Error code has changedView Change Details
    2023-12-28The Error code has changedView Change Details
    2023-12-18The Error code has changedView Change Details
    2023-10-09The Error code has changedView Change Details
    2023-10-07The Error code has changedView Change Details
    2023-09-27The Error code has changed. The request parameters of the API has changedView Change Details
    2023-09-26The Error code has changedView Change Details
    2023-09-18The request parameters of the API has changedView Change Details