Scaling group ID. obtain available scaling group ids in the following ways:

The scaling group name must be unique in your account. name only supports chinese, english, digits, underscore, separator "-", and decimal point. the maximum length cannot exceed 55 bytes.

Default cooldown in seconds, value ranges from 0 to 3600, default value is 300.

Expected number of instances. value range [0,2000]. to meet the maximum value equal to or greater than the expected value, and the expected value equal to or greater than the minimum value.

Launch configuration ID. obtain available launch configuration ids in the following ways:

Maximum number of instances. value range: [0,2000]. to meet the requirement, the maximum value must be equal to or greater than the expected value, and the expected value must be equal to or greater than the minimum value.

Minimum number of instances. value range: [0,2000]. to meet the requirement, the maximum value must be equal to or greater than the expected value, and the expected value must be equal to or greater than the minimum value.

Project ID. obtain this parameter by calling the ProjectId field in the return value of DescribeProject. default value is 0, indicating usage of the default project.

subnet ID list. valid vpc subnet ids can be obtained by logging in to the console for querying. you can also call the API DescribeSubnets and retrieve them from the SubnetId field in the API response.

Termination policy, whose maximum length is currently 1. valid values: OLDEST_INSTANCE and NEWEST_INSTANCE.

vpc ID. when modifying the vpc, you need to change the SubnetIds parameter to the subnet of this vpc. effective VpcId can be queried by logging in to the console; you can also call the DescribeVpc api and get the VpcId field from the api response.

AZ list

RETRY policy, whose valid values include IMMEDIATE_RETRY, INCREMENTAL_INTERVALS, and NO_RETRY, with the default value being IMMEDIATE_RETRY. a partially successful scaling operation is considered a failed activity.

Availability Zone validation policy. valid values include ALL and ANY. default value: ANY. it is effective when scaling group actual change resource-related fields (launch configuration, az, subnet) are modified.

common causes for unavailable azs or subnets include CVM instancetype sold out in the az, CBS cloud disk sold out in the az, insufficient quota in the az, or insufficient IP addresses in the subnet.

if Zones/SubnetIds contain nonexistent azs or subnets, a verification error will be reported regardless of the values of ZonesCheckPolicy.

Service settings, including cloud monitoring and unhealthy instance replacement.

The instance has a configuration for the number of IPv6 addresses. valid values include 0 and 1. the default value is 0, which means the instance does not allocate an IPv6 address. you need to use a VPC that supports IPv6 and enable IPv6 CIDR in the subnet.

The multi-az/subnet policy, with values including PRIORITY and EQUALITY, defaults to PRIORITY.

points to consider:

Scaling group instance health check type, values are as follows:

Specifies the CLB health check grace period in seconds.

value range: [0, 7200].

default value: 0.

Instance allocation policy. valid values include LAUNCH_CONFIGURATION and SPOT_MIXED.

Allocation policy of instances for each billing type in SPOT hybrid mode.
available only when InstanceAllocationPolicy is set to SPOT_MIXED.

The capacity rebalancing feature is only applicable to spot instances within the scaling group. valid values:

Instance name sequencing settings. once enabled, append incremental numeric sequence to the names of instances automatically created within the scaling group.

Instance hostname sequencing settings. once enabled, append incremental numeric sequence to the hostname of instances automatically created within the scaling group.

The concurrent scaling up functionality for matching expected numbers cannot be set when InstanceAllocationPolicy is in spot hybrid mode or when ScalingMode is in the scaling-prioritized startup mode. currently only two matching expected number scale-out activities are supported to run concurrently. other types of activities such as specified quantity scale-out or scale-in cannot be specified. set to FALSE indicates disabled.