Modifying an AS Group

Function

This API is used to modify a specified AS group.

When the AS configuration of an AS group is changed, the existing instances created using the original AS configuration are not affected.
If no scaling action is being performed, you can modify its subnet and AZ configurations.
Changing the number of expected instances in an AS group will trigger a scaling action to add or remove instances to or from the AS group. The number of expected instances must be greater than or equal to the minimum number of instances and less than or equal to the maximum number of instances.

URI

PUT /autoscaling-api/v1/{project_id}/scaling_group/{scaling_group_id}

**Table 1** Parameter description
Parameter	Mandatory	Type	Description
project_id	Yes	String	Specifies the project ID.
scaling_group_id	Yes	String	Specifies the AS group ID.

Request Message

Request parameters

**Table 2** Request parameters
Parameter	Mandatory	Type	Description
scaling_group_name	No	String	Specifies the AS group name. The name contains only letters, digits, underscores (_), and hyphens (-), and cannot exceed 64 characters.
desire_instance_number	No	Integer	Specifies the expected number of instances. The value ranges from the minimum number of instances to the maximum number of instances.
min_instance_number	No	Integer	Specifies the minimum number of instances.
max_instance_number	No	Integer	Specifies the maximum number of instances, which is greater than or equal to the minimum number of instances.
cool_down_time	No	Integer	Specifies the cooldown period (in seconds). The value ranges from 0 to 86400 and is 300 by default.
available_zones	No	Array of strings	Specifies the AZ information. The instances added in a scaling action will be created in a specified AZ. If you do not specify an AZ, the system automatically specifies one. You can change the AZ of an AS group only when no scaling action is being performed in the group.
networks	No	Array of networks objects	Specifies network information. You can select up to five subnets. The first subnet you select is used by the primary NICs of ECSs by default. For the information about the data structure, see Table 4. The value of this parameter can be changed only when all the following conditions are met: No scaling actions are triggered in the AS group. The number of instances in the AS group is 0. The AS group is not in service.
security_groups	No	Array of security_groups objects	Specifies the security group. A maximum of one security group can be selected. For information about the data structure, see Table 5. If the security group is specified both in the AS configuration and AS group, scaled ECS instances will be added to the security group specified in the AS configuration. If the security group is not specified in either of them, scaled ECS instances will be added to the default security group. For your convenience, you are advised to specify the security group in the AS configuration. The value of this parameter can be changed only when all the following conditions are met: No scaling actions are triggered in the AS group. The number of instances in the AS group is 0. The AS group is not in service.
lbaas_listeners	No	Array of lbaas_listeners objects	Specifies information about an enhanced load balancer. The system supports the binding of up to six load balancers. This parameter is in list data structure. For details, see Table 3.
health_periodic_audit_method	No	String	Specifies the health check method for instances in the AS group. The health check methods include ELB_AUDIT and NOVA_AUDIT. When load balancing is configured for an AS group, the default value is ELB_AUDIT. Otherwise, the default value is NOVA_AUDIT. ELB_AUDIT: indicates the ELB health check, which takes effect in an AS group with a listener. NOVA_AUDIT: indicates the ECS health check, which is the health check method delivered with AS.
health_periodic_audit_time	No	Integer	Specifies the health check period for the instances in the AS group. The value can be 1, 5, 15, 60, or 180 in the unit of minutes. If the value is set to 0, health check is performed every 10 seconds.
instance_terminate_policy	No	String	Specifies the instance removal policy. OLD_CONFIG_OLD_INSTANCE (default): The earlier-created instances based on the earlier-created AS configurations are removed first. OLD_CONFIG_NEW_INSTANCE: The later-created instances based on the earlier-created AS configurations are removed first. OLD_INSTANCE: The earlier-created instances are removed first. NEW_INSTANCE: The later-created instances are removed first.
health_periodic_audit_grace_period	No	Integer	Specifies the grace period for instance health check. The unit is second and value range is 0-86400. The default value is 600. The health check grace period starts after an instance is added to an AS group and is enabled. The AS group will start checking the instance status only after the grace period ends. This parameter is valid only when the instance health check method of the AS group is ELB_AUDIT.
scaling_configuration_id	No	String	Specifies the AS configuration ID, which can be obtained using the API for querying AS configurations. For details, see Querying AS configurations.
notifications	No	Array of strings	Specifies the notification mode. EMAIL refers to notification by email. This notification mode has been canceled. You are advised to configure the notification function for the AS group. For details, see Notifications.
delete_publicip	No	Boolean	Specifies whether to delete the EIP bound to the ECS when deleting the ECS. If you do not want to delete the EIP, set this parameter to false. Then, the system only unbinds the EIP from the ECS and reserves the EIP. true: deletes the EIP bound to the ECS when deleting the ECS. If the EIP is billed on a yearly/monthly basis, it will not be deleted when the ECS is deleted. false: only unbinds the EIP bound to the ECS when deleting the ECS.
delete_volume	No	Boolean	Specifies whether to delete the data disks attached to the ECS when deleting the ECS. The value can be true or false. The default value is false. true: deletes the data disks attached to the ECS when deleting the ECS. If the data disks are billed a yearly/monthly basis, they will not be deleted when the ECS is deleted. false: only detaches the data disks attached to the ECS when deleting the ECS.
multi_az_priority_policy	No	String	Specifies the priority policy used to select target AZs when adjusting the number of instances in an AS group. EQUILIBRIUM_DISTRIBUTE (default): When adjusting the number of instances, ensure that instances in each AZ in the available_zones list is evenly distributed. If instances cannot be added in the target AZ, select another AZ based on the PICK_FIRST policy. PICK_FIRST: When adjusting the number of instances, target AZs are determined in the order in the available_zones list.
description	No	String	Specifies the description of the AS group. The value can contain 1 to 256 characters.

**Table 3** **lbaas_listeners** field description
Parameter	Mandatory	Type	Description
pool_id	Yes	String	Specifies the backend ECS group ID. The value of this parameter can be changed only when all the following conditions are met: No scaling actions are triggered in the AS group. The number of instances in the AS group is 0. The AS group is not in service.
protocol_port	Yes	Integer	Specifies the backend protocol ID, which is the port on which a backend ECS listens for traffic. The port ID ranges from 1 to 65535.
weight	Yes	Integer	Specifies the weight, which determines the portion of requests a backend ECS processes when being compared to other backend ECSs added to the same listener. The value of this parameter ranges from 0 to 100.

**Table 4** **networks** field description
Parameter	Mandatory	Type	Description
id	Yes	String	Specifies the subnet ID.

**Table 5** **security_groups** field description
Parameter	Mandatory	Type	Description
id	Yes	String	Specifies the ID of the security group.

Example request

This example shows how to change the name, AS configuration, expected number of instances, minimum number of instances, maximum number of instances, and cooldown period of the AS group with ID a8327883-6b07-4497-9c61-68d03ee193a1.

PUT https://{Endpoint}/autoscaling-api/v1/{project_id}/scaling_group/a8327883-6b07-4497-9c61-68d03ee193a1

{
    "scaling_group_name": "group_1",
    "scaling_configuration_id": "f8327883-6a07-4497-9a61-68c03e8e72a2",
    "desire_instance_number": 1,
    "min_instance_number": 1,
    "max_instance_number": 3,
    "cool_down_time": 200,
    "multi_az_priority_policy": "PICK_FIRST"
 
}

Response Message

Response parameters

**Table 6** Response parameters
Parameter	Type	Description
scaling_group_id	String	Specifies the AS group ID.

Example response

{
    "scaling_group_id": "a8327883-6b07-4497-9c61-68d03ee193a1"
}

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.