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    Server Load Balancer:ModifyLoadBalancerInstanceSpec

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    Server Load Balancer:ModifyLoadBalancerInstanceSpec

    Last Updated:Jul 02, 2025

    Modifies the specification of a CLB instance.

    Operation description

    Pay-by-specification CLB instances have been discontinued since 00:00:00 on June 1, 2025 (UTC+8). For more information, see End-of-sale for pay-by-specification CLB instances.

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    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 support 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

    slb:ModifyLoadBalancerInstanceSpec

    update

    *loadbalancer

    acs:slb:{#regionId}:{#accountId}:loadbalancer/{#loadbalancerId}

    slb:tag

    slb:tag

    None

    Request parameters

    Parameter

    Type

    Required

    Description

    Example

    RegionId

    string

    No

    The region ID of the CLB instance.

    You can query the region ID from the Regions and zones list or by calling the DescribeRegions operation.

    cn-hangzhou

    LoadBalancerId

    string

    Yes

    The ID of the CLB instance.

    lb-bp1b6c719df*********

    LoadBalancerSpec

    string

    Yes

    The specification of the CLB instance. Valid values:

    • slb.s1.small

    • slb.s2.small

    • slb.s2.medium

    • slb.s3.small

    • slb.s3.medium

    • slb.s3.large

    The specifications available vary by region. For more information about the specifications, see CLB instances.

    Note

    When you switch a shared-resource CLB instance to a high-performance CLB instance, your service may be interrupted for 10 to 30 seconds. We recommend that you modify the specification during off-peak hours or use Alibaba Cloud DNS to schedule your workloads to another CLB instance before you modify the specification.

    slb.s2.small

    AutoPay

    boolean

    No

    Specifies whether to enable automatic payment. Valid values:

    • true: automatically completes the payment.

    • false (default): If you select this option, you must complete the payment in the Order Center.

    Note

    This parameter takes effect only for subscription instances.

    false

    Response parameters

    Parameter

    Type

    Description

    Example

    object

    OrderId

    integer

    The order ID of the subscription CLB instance.

    201429619788910

    RequestId

    string

    The request ID.

    365F4154-92F6-4AE4-92F8-7FF34B540710

    Error codes

    HTTP status code

    Error code

    Error message

    Description

    400

    ModifySpecNotAllowed

    LoadBalancerSpec not allowed for this instance

    400

    Operation.NotAllowed

    Operation Denied, Your account does not have enough balance.

    400

    InvalidParameter.Bandwidth

    The param Bandwidth is invalid.

    400

    ChangeLbSpecNotAllowed

    You cannot change the specification for the specified load balancer.

    400

    OperationDenied.PayByCLCU

    The operation is not allowed because the instanceChargeType of loadbalancer is PayByCLCU.

    See Error Codes for a complete list.

    Release notes

    See Release Notes for a complete list.