Help Center/ Auto Scaling/ API Reference/ APIs/ AS Policies/ Creating an AS Policy (V2)
Updated on 2024-07-22 GMT+08:00

Creating an AS Policy (V2)

Function

This API is used to create an AS policy for an AS group or bandwidth.

The difference between the V2 and V1 APIs for creating an AS policy is that V2 supports creating an AS policy for adjusting bandwidth and differentiating scaling resources by their types.

URI

POST /autoscaling-api/v2/{project_id}/scaling_policy

Table 1 Parameter description

Parameter

Mandatory

Type

Description

project_id

Yes

String

Specifies the project ID.

Request

Table 2 Request parameters

Parameter

Mandatory

Type

Description

scaling_policy_name

Yes

String

Specifies the AS policy name. The name contains only letters, digits, underscores (_), and hyphens (-), and cannot exceed 64 characters.

scaling_resource_id

Yes

String

Specifies the scaling resource ID, which is the unique ID of an AS group or bandwidth.

  • If scaling_resource_type is set to SCALING_GROUP, this parameter indicates the unique AS group ID.
  • If scaling_resource_type is set to BANDWIDTH, this parameter indicates the unique bandwidth ID.
    NOTE:

    AS cannot scale yearly/monthly bandwidths.

scaling_resource_type

Yes

String

Specifies the scaling resource type.

  • AS group: SCALING_GROUP
  • Bandwidth: BANDWIDTH

scaling_policy_type

Yes

String

Specifies the AS policy type.

  • ALARM (corresponding to alarm_id): indicates that the scaling action is triggered by an alarm.
  • SCHEDULED (corresponding to scheduled_policy): indicates that the scaling action is triggered as scheduled.
  • RECURRENCE (corresponding to scheduled_policy): indicates that the scaling action is triggered periodically.
  • INTERVAL_ALARM (corresponding to alarm_id): indicates that the scaling action is triggered by a refined scaling policy.

alarm_id

No

String

Specifies the alarm rule ID. This parameter is mandatory when scaling_policy_type is set to ALARM. After this parameter is specified, the value of scheduled_policy does not take effect.

After you create an alarm policy, the system automatically adds an alarm triggering activity of the autoscaling type to the alarm_actions field in the alarm rule specified by the parameter value.

You can obtain the parameter value by querying Cloud Eye alarm rules. For details, see Querying the Alarm Rule List in Cloud Eye API Reference.

scheduled_policy

No

scheduled_policy object

Specifies the periodic or scheduled AS policy. This parameter is mandatory when scaling_policy_type is set to SCHEDULED or RECURRENCE. After this parameter is specified, the value of alarm_id does not take effect. For details, see Table 3.

scaling_policy_action

No

scaling_policy_action object

Specifies the scaling action of the AS policy. For details, see Table 4.

interval_alarm_actions

No

Array of interval_alarm_actions objects

Specifies the value range of an alarm policy. This parameter is valid and mandatory when scaling_policy_type is set to INTERVAL_ALARM. For details, see Table 5.

cool_down_time

No

Integer

Specifies the cooldown period (in seconds). The value ranges from 0 to 86400 and is 300 by default.

description

No

String

Specifies the description of the AS policy. The value can contain 1 to 256 characters.

Table 3 scheduled_policy field description

Parameter

Mandatory

Type

Description

launch_time

Yes

String

Specifies the time when the scaling action is triggered. The time format complies with UTC.

  • If scaling_policy_type is set to SCHEDULED, the time format is YYYY-MM-DDThh:mmZ.
  • If scaling_policy_type is set to RECURRENCE, the time format is hh:mm.

recurrence_type

No

String

Specifies the periodic triggering type. This parameter is mandatory when scaling_policy_type is set to RECURRENCE.

  • Daily: indicates that the scaling action is triggered once a day.
  • Weekly: indicates that the scaling action is triggered once a week.
  • Monthly: indicates that the scaling action is triggered once a month.

recurrence_value

No

String

Specifies the day when a periodic scaling action is triggered. This parameter is mandatory when scaling_policy_type is set to RECURRENCE.

  • If recurrence_type is set to Daily, the value is null, indicating that the scaling action is triggered once a day.
  • If recurrence_type is set to Weekly, the value ranges from 1 (Sunday) to 7 (Saturday). The digits refer to dates in each week and separated by a comma, such as 1,3,5.
  • If recurrence_type is set to Monthly, the value ranges from 1 to 31. The digits refer to the dates in each month and separated by a comma, such as 1,10,13,28.
    NOTE:

    When recurrence_type is set to Daily, this parameter does not take effect.

start_time

No

String

Specifies the start time of the scaling action triggered periodically. The time format complies with UTC. The default value is the local time.

The time format is YYYY-MM-DDThh:mmZ.

end_time

No

String

Specifies the end time of the scaling action triggered periodically. The time format complies with UTC. This parameter is mandatory when scaling_policy_type is set to RECURRENCE. When the scaling action is triggered periodically, the end time cannot be earlier than the current and start time.

The time format is YYYY-MM-DDThh:mmZ.

Table 4 scaling_policy_action field description

Parameter

Mandatory

Type

Description

operation

No

String

Specifies the operation to be performed. The default operation is ADD.
  • If scaling_resource_type is set to SCALING_GROUP, the following operations are supported:
    • ADD: indicates adding instances.
    • REMOVE/REDUCE: indicates removing or reducing instances.
    • SET: indicates setting the number of instances to a specified value.
  • If scaling_resource_type is set to BANDWIDTH, the following operations are supported:
    • ADD: indicates adding instances.
    • REDUCE: indicates reducing instances.
    • SET: indicates setting the number of instances to a specified value.

size

No

Integer

Specifies the operation size. The value is an integer from 0 to 300. The default value is 1. This parameter can be set to 0 only when operation is set to SET.

  • If scaling_resource_type is set to SCALING_GROUP, this parameter indicates the number of instances. The value is an integer from 0 to 300 and the default value is 1.
  • If scaling_resource_type is set to BANDWIDTH, this parameter indicates the bandwidth (Mbit/s). The value is an integer from 1 to 300 and the default value is 1.
  • If scaling_resource_type is set to SCALING_GROUP, either size or percentage can be set.

percentage

No

Integer

Specifies the percentage of instances to be operated. If operation is set to ADD, REMOVE, or REDUCE, the value of this parameter is an integer from 1 to 20000. If operation is set to SET, the value is an integer from 0 to 20000.

  • If scaling_resource_type is set to SCALING_GROUP, either size or percentage can be set. If neither size nor percentage is set, the default value of size is 1.
  • If scaling_resource_type is set to BANDWIDTH, percentage is unavailable.

limits

No

Integer

Specifies the operation restrictions.

If scaling_resource_type is set to BANDWIDTH and operation is not SET, this parameter takes effect and the unit is Mbit/s.

  • If operation is set to ADD, this parameter indicates the maximum bandwidth allowed.
  • If operation is set to REDUCE, this parameter indicates the minimum bandwidth allowed.
Table 5 interval_alarm_actions field description

Parameter

Mandatory

Type

Description

lower_bound

No

double

Specifies the lower limit of the value range. The value is null by default.

If the lower limit of the value range is null, the upper limit must be less than or equal to 0.

The minimum lower limit allowed is -1.174271E108.

upper_bound

No

double

Specifies the upper limit of the value range. The value is null by default.

If the upper limit of the range is null, the lower limit must be greater than or equal to 0.

The maximum upper limit allowed is 1.174271E108.

operation

No

String

Specifies the operation to be performed. The default operation is ADD.

  • If scaling_resource_type is set to SCALING_GROUP, the following operations are supported:
    • ADD: indicates adding instances.
    • REMOVE/REDUCE: indicates removing or reducing instances.
    • SET: indicates setting the number of instances to a specified value.
  • If scaling_resource_type is set to BANDWIDTH, the following operations are supported:
    • ADD: indicates adding instances.
    • REDUCE: indicates reducing instances.
    • SET: indicates setting the number of instances to a specified value.

size

No

Integer

Specifies the operation size. The value is an integer from 0 to 300. The default value is 1.

This parameter can be set to 0 only when operation is set to SET.

  • If scaling_resource_type is set to SCALING_GROUP, this parameter indicates the number of instances. The value is an integer from 0 to 300 and the default value is 1.
  • If scaling_resource_type is set to BANDWIDTH, this parameter indicates the bandwidth (Mbit/s). The value is an integer from 1 to 300 and the default value is 1.
  • If scaling_resource_type is set to SCALING_GROUP, either size or percentage can be set.

percentage

No

Integer

Specifies the percentage of instances to be operated. When the operation is ADD, REMOVE, or REDUCE, the value is an integer from 1 to 20000.

When the operation is SET, the value is an integer from 0 to 20000.

  • If scaling_resource_type is set to SCALING_GROUP, either size or percentage can be set. If neither size nor percentage is set, the default value of size is 1.
  • If scaling_resource_type is set to BANDWIDTH, percentage is unavailable.

limits

No

Integer

Specifies the operation restrictions.

If scaling_resource_type is set to BANDWIDTH and operation is not SET, this parameter takes effect and the unit is Mbit/s.

  • If operation is set to ADD, this parameter indicates the maximum bandwidth allowed.
  • If operation is set to REDUCE, this parameter indicates the minimum bandwidth allowed.
  • The alarm value range of a refined scaling policy is the threshold of the alarm rule plus the upper and lower limits of the value range.
  • If the lower limit of a value range is null, the minimum lower limit is -1.174271E108. If the upper limit of the range is null, the maximum upper limit is 1.174271E108.

For example:

You set the alarm rule for an AS policy to CPU usage ≥ 30% and add the following two value ranges:

Scaling Action is set to 30% ≤ CPU usage < 60%, add 1 instance. Then lower_bound should be set to 0 and upper_bound to 30.

Scaling Action is set to 60% ≤ CPU usage < positive infinite, add 2 instances. Then lower_bound should be set to 30 and upper_bound to 1.174271E108 or null.

  • If neither the upper nor lower limit of a value range is null, they must be both greater than or equal to, or less than or equal to 0.
  • If multiple refined scaling policies are added, their value ranges cannot overlap.
  • If the operator of an alarm rule is =, no range can be added.

Example Request

This example creates an alarm-based scaling policy named hth_aspolicy_1 using the alarm rule with ID al1513822380493GvlJKZwA8. The action defined in the policy is to increase the bandwidth with ID 8ade64b5-d685-40b8-8582-4ce306ea37a6 by 1 Mbit/s when the alarm threshold configured in the alarm rule is reached until the bandwidth reaches 10 Mbit/s.
POST https://{Endpoint}/autoscaling-api/v2/{project_id}/scaling_policy

{ 
    "alarm_id": "al1513822380493GvlJKZwA8",
    "cool_down_time": 900,
    "scaling_resource_id": "8ade64b5-d685-40b8-8582-4ce306ea37a6",
    "scaling_resource_type": "BANDWIDTH",
    "scaling_policy_action": {
           "size": 1,
           "operation": "ADD",
           "limits": 10
    },
    "scaling_policy_name": "hth_aspolicy_1",
    "scaling_policy_type": "ALARM"
}

Response

Table 6 Response parameters

Parameter

Type

Description

scaling_policy_id

String

Specifies the AS policy ID.

Example Response

{ 
     "scaling_policy_id": "0h327883-324n-4dzd-9c61-68d03ee191dd"  
}

Returned Values

  • Normal

    200

  • Abnormal

    Returned Value

    Description

    400 Bad Request

    The server failed to process the request.

    401 Unauthorized

    You must enter the username and password to access the requested page.

    403 Forbidden

    You are forbidden to access the requested page.

    404 Not Found

    The server could not find the requested page.

    405 Method Not Allowed

    You are not allowed to use the method specified in the request.

    406 Not Acceptable

    The response generated by the server could not be accepted by the client.

    407 Proxy Authentication Required

    You must use the proxy server for authentication to process the request.

    408 Request Timeout

    The request timed out.

    409 Conflict

    The request could not be processed due to a conflict.

    500 Internal Server Error

    Failed to complete the request because of an internal service error.

    501 Not Implemented

    Failed to complete the request because the server does not support the requested function.

    502 Bad Gateway

    Failed to complete the request because the request is invalid.

    503 Service Unavailable

    Failed to complete the request because the system is unavailable.

    504 Gateway Timeout

    A gateway timeout error occurred.

Error Codes

See Error Codes.