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Auto Scaling:ModifyScheduledTask

Last Updated:Aug 28, 2026

Modifies a scheduled task. You can adjust parameter settings such as the scaling rule to execute and the boundary values of your scaling group, without creating a new scheduled task.

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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 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

ess:ModifyScheduledTask

update

*ScalingGroup

acs:ess:{#regionId}:{#accountId}:scalinggroup/{#ScalingGroupId}

None None

Request parameters

Parameter

Type

Required

Description

Example

ScheduledTaskId

string

Yes

The ID of the scheduled task.

edRtShc57WGXdt8TlPbr****

ScheduledTaskName

string

No

The name of the scheduled task. The name must be 2 to 64 characters in length, and can contain letters, digits, underscores (_), hyphens (-), and periods (.). It must start with a letter or a digit. The name of the scheduled task must be unique in the region and within the Alibaba Cloud account.

scheduled****

Description

string

No

The description of the scheduled task. The description must be 2 to 200 characters in length.

Test scheduled task.

ScheduledAction

string

No

The scaling rule to execute when the scheduled task is triggered. Specify the scaling rule ID. If you specify ScheduledAction, you must select an existing scaling rule for the scheduled task.

Note

You can specify only one of ScheduledAction and ScalingGroupId.

ari:acs:ess:cn-hangzhou:14069264****:scalingrule/asr-bp12tcnol686y1ik****

RecurrenceEndTime

string

No

The end time of the scheduled task, in the ISO 8601 format of YYYY-MM-DDThh:mmZ (UTC). The value cannot be later than 365 days from the modification time.

2014-08-20T16:55Z

LaunchTime

string

No

The time at which the scheduled task is triggered, in the ISO 8601 format of YYYY-MM-DDThh:mmZ (UTC). The value cannot be later than 90 days from the modification time.

  • If you specify the RecurrenceType parameter, the task is executed repeatedly at the time specified by LaunchTime.

  • If you do not specify the RecurrenceType parameter, the task is executed only once at the time specified by LaunchTime.

2014-08-18T10:52Z

RecurrenceType

string

No

The interval at which the scheduled task is repeated. Valid values:

  • Daily: The scheduled task is executed once every specified number of days.

  • Weekly: The scheduled task is executed on each specified day of the week.

  • Monthly: The scheduled task is executed on each specified day of the month.

  • Cron: The scheduled task is executed based on the specified cron expression.

After you modify the scheduled task, the values that you specify for the RecurrenceType and RecurrenceValue parameters must be valid at the same time.

Daily

RecurrenceValue

string

No

The number of recurrences of the scheduled task.

  • If you set the RecurrenceType parameter to Daily, you can specify only one value for this parameter. Valid values: 1 to 31.

  • If you set the RecurrenceType parameter to Weekly, you can specify multiple values for this parameter. Separate the values with commas (,). The values that correspond to Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, and Saturday are 0, 1, 2, 3, 4, 5, and 6.``

  • If you set the RecurrenceType parameter to Monthly, you can specify two values in the A-B format for this parameter. Valid values of A and B: 1 to 31. B must be greater than or equal to A.

  • If you set the RecurrenceType parameter to Cron, you can specify a cron expression. A cron expression is written in UTC time and consists of the following fields: minute, hour, day, month, and week. The expression can contain the letters L and W and the following wildcard characters: commas (,), question marks (?), hyphens (-), asterisks (*), number signs (#), and forward slashes (/).

After you modify the scheduled task, the values that you specify for the RecurrenceType and RecurrenceValue parameters must be valid at the same time.

2

TaskEnabled

boolean

No

Whether to enable the scheduled task. Valid values:

  • true

  • false

Default value: true.

true

LaunchExpirationTime

integer

No

The retry timeout period for a failed scheduled task. Unit: seconds. Valid values: 0 to 1800.

Default value: 600.

600

MinValue

integer

No

The minimum number of instances in the scaling group if you specify the ScalingGroupId parameter.

0

MaxValue

integer

No

The maximum number of instances in the scaling group if you specify the ScalingGroupId parameter.

10

DesiredCapacity

integer

No

The expected number of instances in the scaling group if you specify the ScalingGroupId parameter.

Note

You must specify the DesiredCapacity parameter when you create a scaling group.

10

ScalingGroupId

string

No

The ID of the scaling group whose number of instances must be modified when the scheduled task is triggered. If you specify the ScalingGroupId parameter for a scheduled task, you must specify the minimum, maximum, or expected numbers of instances for a scaling group in the scheduled task. That is, you must specify at least one of the MinValue, MaxValue, and DesiredCapacity parameters.

Note

You cannot specify the ScheduledAction and ScalingGroupId parameters at the same time.

asg-bp18p2yfxow2dloq****

RegionId

string

No

The region ID.

cn-hangzhou

Response elements

Element

Type

Description

Example

object

RequestId

string

The request ID.

473469C7-AA6F-4DC5-B3DB-A3DC0DE3****

Examples

Success response

JSON format

{
  "RequestId": "473469C7-AA6F-4DC5-B3DB-A3DC0DE3****"
}

Error codes

HTTP status code

Error code

Error message

Description

400 Throttling Request was denied due to request throttling.

See Error Codes for a complete list.

Release notes

See Release Notes for a complete list.