Auto Scaling：ModifyScalingGroup

Action

String

Yes

ModifyScalingGroup

The operation that you want to perform. Set the value to ModifyScalingGroup.

ScalingGroupId

String

Yes

asg-bp1ffogfdauy0jw0****

The ID of the scaling group that you want to modify.

ScalingGroupName

String

No

scalinggroup****

The name of the scaling group. The name of a scaling group must be unique in a region. The name must be 2 to 64 characters in length, and can contain letters, digits, underscores (_), hyphens (-), and periods (.). The name must start with a letter or a digit.

MinSize

Integer

No

1

The minimum number of ECS instances or elastic container instances that must be contained in the scaling group. If the number of instances in the scaling group is less than the value of MinSize, Auto Scaling automatically adds instances to the scaling group until the number of instances is equal to the value of MinSize.

MaxSize

Integer

No

99

The maximum number of ECS instances or elastic container instances that can be contained in the scaling group. If the number of instances in the scaling group is greater than the value of MaxSize, Auto Scaling automatically removes instances from the scaling group until the number of instances is equal to the value of MaxSize.

The value range of MaxSize varies based on the instance quota. You can go to Quota Center to check the quota of instances that can be added to a scaling group.

For example, if the quota of instances that can be added to a scaling group is 2,000, the value range of MaxSize is from 0 to 2000.

DefaultCooldown

Integer

No

600

The cooldown period of the scaling group after a scaling activity is complete. Valid values: 0 to 86400. Unit: seconds.

During the cooldown period, Auto Scaling does not execute scaling activities that are triggered by CloudMonitor event-triggered tasks in the scaling group.

RemovalPolicy.1

String

No

OldestScalingConfiguration

The first step of the instance removal policy. Valid values:

• OldestInstance: removes ECS instances that are added at the earliest point in time to the scaling group.

• NewestInstance: removes ECS instances that are most recently added to the scaling group.

• OldestScalingConfiguration: removes ECS instances that are created from the earliest scaling configuration.

• CustomPolicy: removes ECS instances based on the custom scale-in policy (Function).

RemovalPolicy.2

String

No

NewestInstance

The second step of the instance removal policy. Valid values:

• OldestInstance: removes ECS instances that are added at the earliest point in time to the scaling group.

• NewestInstance: removes ECS instances that are most recently added to the scaling group.

• OldestScalingConfiguration: removes ECS instances that are created from the earliest scaling configuration.

  Note

  The scaling configuration source specified by OldestScalingConfiguration can be a scaling configuration or a launch template.

RemovalPolicy.3

String

No

OldestInstance

The third step of the instance removal policy. Valid values:

• OldestInstance: removes ECS instances that are added at the earliest point in time to the scaling group.

• NewestInstance: removes ECS instances that are most recently added to the scaling group.

• OldestScalingConfiguration: removes ECS instances that are created from the earliest scaling configuration.

ActiveScalingConfigurationId

String

No

asc-bp17pelvl720x5ub****

The ID of the active scaling configuration in the scaling group.

HealthCheckType

String

No

ECS

The health check mode of the scaling group. Valid values:

• NONE: Auto Scaling does not perform health checks on instances in the scaling group.

• ECS: Auto Scaling performs health checks on instances in the scaling group. If you want to enable instance health check, set the value to ECS, regardless of whether the scaling group is of the ECS or Elastic Container Instance type.

• LOAD_BALANCER: Auto Scaling performs health checks on instances based on the health check results of load balancers. The health check results of Classic Load Balancer (CLB) instances are not supported as the health check basis for instances in the scaling group.

Default value: ECS.

LaunchTemplateId

String

No

lt-m5e3ofjr1zn1aw7****

The ID of the launch template that is used by Auto Scaling to create instances.

LaunchTemplateVersion

String

No

Default

The version number of the launch template. Valid values:

• A fixed template version number.

• Default: the default version of the template.

• Latest: the latest version of the template.

OnDemandBaseCapacity

Integer

No

30

The minimum number of pay-as-you-go instances that must be contained in the scaling group. Valid values: 0 to 1000. If the number of pay-as-you-go instances is less than the value of this parameter, Auto Scaling creates pay-as-you-go instances.

If you set MultiAZPolicy to COMPOSABLE, the default value is 0.

OnDemandPercentageAboveBaseCapacity

Integer

No

20

The percentage of pay-as-you-go instances among the excess instances when the minimum number of pay-as-you-go instances is reached. Valid values: 0 to 100.

If you set MultiAZPolicy to COMPOSABLE, the default value is 100.

SpotInstanceRemedy

Boolean

No

true

Specifies whether to enable the supplementation of preemptible instances. If you set this parameter to true, Auto Scaling creates an instance to replace a preemptible instance when Auto Scaling receives the system message that the preemptible instance is to be reclaimed.

CompensateWithOnDemand

Boolean

No

true

Specifies whether to automatically create pay-as-you-go instances to reach the minimum number of ECS instances in the scaling group when the required number of preemptible instances cannot be reached due to reasons such as cost-related issues and insufficient resources. This parameter takes effect only if you set MultiAZPolicy to COST_OPTIMIZED in the CreateScalingGroup operation. Valid values:

• true

• false

SpotInstancePools

Integer

No

5

The number of instance types. Auto Scaling evenly creates preemptible instances of multiple instance types that are provided at the lowest cost across the zones of the scaling group. Valid values: 0 to 10.

If you set MultiAZPolicy to COMPOSABLE, the default value is 2.

DesiredCapacity

Integer

No

5

The expected number of ECS instances or elastic container instances in the scaling group. If you specify this parameter, the Expected Number of Instances feature is enabled. In this case, Auto Scaling maintains the number of instances in the scaling group at the expected number. The expected number cannot be greater than the value of MaxSize and cannot be less than the value of MinSize.

GroupDeletionProtection

Boolean

No

true

Specifies whether to enable the Deletion Protection feature for the scaling group. Valid values:

• true: enables the Deletion Protection feature for the scaling group. The scaling group cannot be deleted.

• false: disables the Deletion Protection feature for the scaling group.

MultiAZPolicy

String

No

PRIORITY

The scaling policy of the multi-zone scaling group of the ECS type. Valid values:

• PRIORITY: Auto Scaling scales ECS instances based on the vSwitch priority. The first vSwitch specified by VSwitchIds.N has the highest priority. Auto Scaling preferentially scales instances in the zone where the vSwitch that has the highest priority resides. If the scaling fails, Auto Scaling attempts to scale instances in the zone where the vSwitch that has the next highest priority resides.

• COST_OPTIMIZED: Auto Scaling preferentially scales out ECS instances whose vCPUs are provided at the lowest price and scales in ECS instances whose vCPUs are provided at the highest price. If preemptible instance types are specified in the active scaling configuration, Auto Scaling preferentially creates preemptible instances. You can use CompensateWithOnDemand to specify whether to automatically create pay-as-you-go instances when Auto Scaling fails to create preemptible instances.

  Note

  COST_OPTIMIZED is valid if you specify multiple instance types or at least one preemptible instance type.

• BALANCE: Auto Scaling evenly distributes ECS instances across the zones that are specified for the scaling group. If ECS instances are unevenly distributed across the zones due to insufficient resources, you can call the RebalanceInstance operation to rebalance the distribution of the ECS instances.

• COMPOSABLE: You can flexibly combine the preceding policies based on your business requirements.

VSwitchIds.N

String

No

vsw-bp1oo2a7isyrb8igf****

The ID of vSwitch N. Valid values of N: 1 to 5.

This parameter takes effect only if the network type of the scaling group is virtual private cloud (VPC). The specified vSwitches and the scaling group must be in the same VPC.

The vSwitches can reside in different zones. The vSwitches are sorted in ascending order based on the value of N. A value of 1 specifies the highest priority. A greater value of N specifies a lower priority. If Auto Scaling fails to create ECS instances in the zone where the vSwitch that has the highest priority resides, Auto Scaling creates ECS instances in the zone where the vSwitch that has the next highest priority resides.

LaunchTemplateOverride.N.InstanceType

String

No

ecs.c5.xlarge

Instance type N. The instance type that is specified by this parameter overwrites the instance type that is specified in the launch template. If you want to scale instances in the scaling group based on the weighted capacity of instances, you must specify LaunchTemplateOverride.N.WeightedCapacity after you specify this parameter.

You can specify multiple instance types by using the Extend Launch Template feature. Valid values of N: 1 to 10.

For information about the valid values of InstanceType in InstanceTypeOverride.N.InstanceType, see Overview of instance families.

LaunchTemplateOverride.N.WeightedCapacity

Integer

No

4

The weight of instance type N. The weight of an instance type specifies the capacity of a single instance of the instance type in the scaling group. If you want to scale instances in the scaling group based on the weighted capacity of instances, you must specify LaunchTemplateOverride.N.WeightedCapacity after you specify LaunchTemplateOverride.N.InstanceType. The values of N in the two parameters must be the same.

A higher weight specifies that a smaller number of instances of instance type N are required to achieve the expected capacity.

Performance metrics, such as the number of vCPUs and the memory size of each instance type, may vary. You can specify different weights for different instance types based on your business requirements.

Example:

• Current capacity: 0.

• Expected number: 6.

• Capacity of ecs.c5.xlarge: 4.

To achieve the expected capacity, Auto Scaling must scale out two ecs.c5.xlarge instances.

Valid values of WeightedCapacity in InstanceTypeOverride.N.WeightedCapacity: 1 to 500.

LaunchTemplateOverride.N.SpotPriceLimit

Float

No

0.025

The maximum bid price of instance type N that is specified by LaunchTemplateOverride.N.InstanceType. You can specify multiple instance types by using the Extend Launch Template feature. Valid values of N: 1 to 10.

AzBalance

Boolean

No

false

Specifies whether to evenly distribute instances in the scaling group across multiple zones. This parameter takes effect only if you set MultiAZPolicy to COMPOSABLE. Valid values:

• true

• false

Default value: false.

AllocationStrategy

String

No

priority

The allocation policy of instances. Auto Scaling selects instance types based on this policy to create the required number of instances. The policy applies to pay-as-you-go instances and preemptible instances. This parameter takes effect only if you set MultiAZPolicy to COMPOSABLE. Valid values:

• priority: Auto Scaling selects instance types based on their specified order to create the required number of instances.

• lowestPrice: Auto Scaling selects instance types that have the lowest unit price of vCPUs to create the required number of instances.

Default value: priority.

SpotAllocationStrategy

String

No

lowestPrice

The allocation policy of preemptible instances. You can use this parameter to specify the allocation policy for preemptible instances. This parameter takes effect only if you set MultiAZPolicy to COMPOSABLE. Valid values:

• priority: Auto Scaling selects instance types based on their specified order to create the required number of preemptible instances.

• lowestPrice: Auto Scaling selects instance types that have the lowest unit price of vCPUs to create the required number of preemptible instances.

Default value: priority.

MaxInstanceLifetime

Integer

No

null

The maximum life span of each instance in the scaling group. Unit: seconds.

Valid values: 86400 to Integer.maxValue. You can also set this parameter to 0. A value of 0 specifies that the instance has an unlimited life span in the scaling group.

Default value: null.

CustomPolicyARN

String

No

acs:fc:cn-zhangjiakou:16145688****:services/ess_custom_terminate_policy.LATEST/functions/ess_custom_terminate_policy_name

The Alibaba Cloud Resource Name (ARN) of the custom scale-in policy (Function). This parameter is available only if you specify CustomPolicy as the first step of the instance removal policy.

DisableDesiredCapacity

Boolean

No

false

Specifies whether to disable the Expected Number of Instances feature for the scaling group. Valid values:

• false

• true

  Note

  You can set this parameter to true only if the scaling group has no ongoing scaling activities. If you set this parameter to true, the value of DesiredCapacity parameter is cleared but the number of existing instances in the scaling group remains unchanged.

ScalingPolicy

String

No

recycle

The instance reclaim mode of the scaling group. Valid values:

• recycle: the economical mode.

• release: the release mode.

• forcerelease: the forced release mode.

  Note

  If you set this parameter to forcerelease, Auto Scaling forcibly releases instances that are in the Running state during scale-in events. Forced release is equivalent to a power outage and may cause ephemeral data on instances to be cleared beyond recovery. Exercise caution when you specify this setting.

• forcerecycle: the forced recycle mode.

  Note

  If you set this parameter to forcerecycle, Auto Scaling forcibly shuts down instances that are in the Running state during scale-in events. Forced shutdown is equivalent to a power outage and may cause ephemeral data on instances to be cleared beyond recovery. Exercise caution when you specify this setting.

ScalingPolicy specifies the reclaim mode of scaling groups. The policy that is used to remove instances from scaling groups is specified by RemovePolicy of the RemoveInstances operation. For more information, see RemoveInstances.

HealthCheckTypes.N

String

No

ECS

The health check modes of the scaling group. Valid values:

• NONE: Auto Scaling does not perform health checks on instances in the scaling group.

• ECS: Auto Scaling performs health checks on instances in the scaling group. If you want to enable instance health check, set the value to ECS, regardless of whether the scaling group is of the ECS or Elastic Container Instance type.

• LOAD_BALANCER: Auto Scaling performs health checks on instances based on the health check results of load balancers. The health check results of CLB instances are not supported as the health check basis for instances in the scaling group.

Default value: ECS.

StopInstanceTimeout

Integer

No

60

The period of time that is required by ECS instances to enter the Stopped state during the scale-in process. Unit: seconds.

Valid values: 30 to 240.

RequestId

String

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

The request ID.