Specifies the minimum number of instances to maintain in the warm pool. This helps you to ensure that there is always a certain number of warmed instances available to handle traffic spikes. Defaults to 0 if not specified.

Specifies the maximum number of instances that are allowed to be in the warm pool or in any state except Terminated for the Auto Scaling group. This is an optional property. Specify it only if you do not want the warm pool size to be determined by the difference between the group's maximum capacity and its desired capacity.

If a value for MaxGroupPreparedCapacity is not specified, Amazon EC2 Auto Scaling launches and maintains the difference between the group's maximum capacity and its desired capacity. If you specify a value for MaxGroupPreparedCapacity, Amazon EC2 Auto Scaling uses the difference between the MaxGroupPreparedCapacity and the desired capacity instead.

The size of the warm pool is dynamic. Only when MaxGroupPreparedCapacity and MinSize are set to the same value does the warm pool have an absolute size.

If the desired capacity of the Auto Scaling group is higher than the MaxGroupPreparedCapacity, the capacity of the warm pool is 0, unless you specify a value for MinSize. To remove a value that you previously set, include the property but specify -1 for the value.

Sets the instance state to transition to after the lifecycle actions are complete. Default is Stopped.

The name of the Auto Scaling group.

The response's http status code.

One or more metrics.

The granularities for the metrics.

The response's http status code.

The token for the next set of items to return. (You received this token from a previous call.)

The maximum number of items to return with this call. The default value is 100 and the maximum value is 100.

The name of the Auto Scaling group.

The load balancers.

A string that indicates that the response contains more items than can be returned in a single response. To receive additional items, specify this string for the NextToken value when requesting the next set of items. This value is null when there are no more items to return.

The response's http status code.

The name of the Auto Scaling group.

The Amazon Resource Name (ARN) of the Amazon Simple Notification Service (Amazon SNS) topic.

The type of event that causes the notification to be sent. To query the notification types supported by Amazon EC2 Auto Scaling, call the DescribeAutoScalingNotificationTypes API.

One or more filters to scope the tags to return. The maximum number of filters per filter type (for example, auto-scaling-group) is 1000.

The token for the next set of items to return. (You received this token from a previous call.)

The maximum number of items to return with this call. The default value is 50 and the maximum value is 100.

A string that indicates that the response contains more items than can be returned in a single response. To receive additional items, specify this string for the NextToken value when requesting the next set of items. This value is null when there are no more items to return.

One or more tags.

The response's http status code.

The name of the Auto Scaling group.

The Amazon Resource Name (ARN) of the Amazon Simple Notification Service (Amazon SNS) topic.

Specifies that the warm pool is to be deleted along with all of its associated instances, without waiting for all instances to be terminated. This parameter also deletes any outstanding lifecycle actions associated with the warm pool instances.

The name of the Auto Scaling group.

The response's http status code.

Available for backward compatibility. Use MinAdjustmentMagnitude instead.

The estimated time, in seconds, until a newly launched instance can contribute to the CloudWatch metrics. If not provided, the default is to use the value from the default cooldown period for the Auto Scaling group.

Valid only if the policy type is TargetTrackingScaling or StepScaling.

Indicates whether the scaling policy is enabled or disabled. The default is enabled. For more information, see Disabling a scaling policy for an Auto Scaling group in the Amazon EC2 Auto Scaling User Guide.

One of the following policy types:

• TargetTrackingScaling

• StepScaling

• SimpleScaling (default)

• PredictiveScaling

A set of adjustments that enable you to scale based on the size of the alarm breach.

Required if the policy type is StepScaling. (Not used with any other policy type.)

A target tracking scaling policy. Provides support for predefined or customized metrics.

The following predefined metrics are available:

• ASGAverageCPUUtilization

• ASGAverageNetworkIn

• ASGAverageNetworkOut

• ALBRequestCountPerTarget

If you specify ALBRequestCountPerTarget for the metric, you must specify the ResourceLabel parameter with the PredefinedMetricSpecification.

For more information, see TargetTrackingConfiguration in the Amazon EC2 Auto Scaling API Reference.

Required if the policy type is TargetTrackingScaling.

Specifies how the scaling adjustment is interpreted (for example, an absolute number or a percentage). The valid values are ChangeInCapacity, ExactCapacity, and PercentChangeInCapacity.

Required if the policy type is StepScaling or SimpleScaling. For more information, see Scaling adjustment types in the Amazon EC2 Auto Scaling User Guide.

A predictive scaling policy. Provides support for only predefined metrics.

Predictive scaling works with CPU utilization, network in/out, and the Application Load Balancer request count.

For more information, see PredictiveScalingConfiguration in the Amazon EC2 Auto Scaling API Reference.

Required if the policy type is PredictiveScaling.

The amount by which to scale, based on the specified adjustment type. A positive value adds to the current capacity while a negative number removes from the current capacity. For exact capacity, you must specify a positive value.

Required if the policy type is SimpleScaling. (Not used with any other policy type.)

The duration of the policy's cooldown period, in seconds. When a cooldown period is specified here, it overrides the default cooldown period defined for the Auto Scaling group.

Valid only if the policy type is SimpleScaling. For more information, see Scaling cooldowns for Amazon EC2 Auto Scaling in the Amazon EC2 Auto Scaling User Guide.

The aggregation type for the CloudWatch metrics. The valid values are Minimum, Maximum, and Average. If the aggregation type is null, the value is treated as Average.

Valid only if the policy type is StepScaling.

The minimum value to scale by when the adjustment type is PercentChangeInCapacity. For example, suppose that you create a step scaling policy to scale out an Auto Scaling group by 25 percent and you specify a MinAdjustmentMagnitude of 2. If the group has 4 instances and the scaling policy is performed, 25 percent of 4 is 1. However, because you specified a MinAdjustmentMagnitude of 2, Amazon EC2 Auto Scaling scales out the group by 2 instances.

Valid only if the policy type is StepScaling or SimpleScaling. For more information, see Scaling adjustment types in the Amazon EC2 Auto Scaling User Guide.

Some Auto Scaling groups use instance weights. In this case, set the MinAdjustmentMagnitude to a value that is at least as large as your largest instance weight.

The name of the Auto Scaling group.

The name of the policy.

The Amazon Resource Name (ARN) of the policy.

The CloudWatch alarms created for the target tracking scaling policy.

The response's http status code.

Set of preferences associated with the instance refresh request. If not provided, the default values are used.

The strategy to use for the instance refresh. The only valid value is Rolling.

A rolling update helps you update your instances gradually. A rolling update can fail due to failed health checks or if instances are on standby or are protected from scale in. If the rolling update process fails, any instances that are replaced are not rolled back to their previous configuration.

The desired configuration. For example, the desired configuration can specify a new launch template or a new version of the current launch template.

Once the instance refresh succeeds, Amazon EC2 Auto Scaling updates the settings of the Auto Scaling group to reflect the new desired configuration.

When you specify a new launch template or a new version of the current launch template for your desired configuration, consider enabling the SkipMatching property in preferences. If it's enabled, Amazon EC2 Auto Scaling skips replacing instances that already use the specified launch template and version. This can help you reduce the number of replacements that are required to apply updates.

The name of the Auto Scaling group.

A unique ID for tracking the progress of the request.

The response's http status code.

The name of the Auto Scaling group.

The Amazon Resource Names (ARN) of the target groups. You can specify up to 10 target groups. To get the ARN of a target group, use the Elastic Load Balancing DescribeTargetGroups API operation.

The response's http status code.

The name of the launch configuration.

The IDs of the instances. You can specify up to 20 instances.

The name of the Auto Scaling group.

Indicates whether to decrement the desired capacity of the Auto Scaling group by the number of instances moved to Standby mode.

The activities related to moving instances into Standby mode.

The response's http status code.

One or more of the following processes:

• Launch

• Terminate

• AddToLoadBalancer

• AlarmNotification

• AZRebalance

• HealthCheck

• InstanceRefresh

• ReplaceUnhealthy

• ScheduledActions

If you omit this parameter, all processes are specified.

The name of the Auto Scaling group.

If the Auto Scaling group of the specified instance has a HealthCheckGracePeriod specified for the group, by default, this call respects the grace period. Set this to False, to have the call not respect the grace period associated with the group.

For more information about the health check grace period, see CreateAutoScalingGroup in the Amazon EC2 Auto Scaling API Reference.

The ID of the instance.

The health status of the instance. Set to Healthy to have the instance remain in service. Set to Unhealthy to have the instance be out of service. Amazon EC2 Auto Scaling terminates and replaces the unhealthy instance.

The IDs of the instances. You can specify up to 20 instances.

The name of the Auto Scaling group.

The activities related to moving instances out of Standby mode.

The response's http status code.

The termination policies supported by Amazon EC2 Auto Scaling: OldestInstance, OldestLaunchConfiguration, NewestInstance, ClosestToNextInstanceHour, Default, OldestLaunchTemplate, and AllocationStrategy.

The response's http status code.

The name of the Auto Scaling group.

The instance refresh ID.

The response's http status code.

The token for the next set of items to return. (You received this token from a previous call.)

The IDs of the instances. If you omit this parameter, all Auto Scaling instances are described. If you specify an ID that does not exist, it is ignored with no error.

Array Members: Maximum number of 50 items.

The maximum number of items to return with this call. The default value is 50 and the maximum value is 50.

A string that indicates that the response contains more items than can be returned in a single response. To receive additional items, specify this string for the NextToken value when requesting the next set of items. This value is null when there are no more items to return.

The instances.

The response's http status code.

The ID of the instance.

A token that uniquely identifies a specific lifecycle action associated with an instance. Amazon EC2 Auto Scaling sends this token to the notification target that you specified when you created the lifecycle hook.

The name of the lifecycle hook.

The name of the Auto Scaling group.

The response's http status code.

Specifies one or more of the following metrics:

• GroupMinSize

• GroupMaxSize

• GroupDesiredCapacity

• GroupInServiceInstances

• GroupPendingInstances

• GroupStandbyInstances

• GroupTerminatingInstances

• GroupTotalInstances

• GroupInServiceCapacity

• GroupPendingCapacity

• GroupStandbyCapacity

• GroupTerminatingCapacity

• GroupTotalCapacity

• WarmPoolDesiredCapacity

• WarmPoolWarmedCapacity

• WarmPoolPendingCapacity

• WarmPoolTerminatingCapacity

• WarmPoolTotalCapacity

• GroupAndWarmPoolDesiredCapacity

• GroupAndWarmPoolTotalCapacity

If you omit this parameter, all metrics are disabled.

The name of the Auto Scaling group.

The IDs of the instances. You can specify up to 20 instances.

The name of the Auto Scaling group.

Indicates whether the Auto Scaling group decrements the desired capacity value by the number of instances detached.

The activities related to detaching the instances from the Auto Scaling group.

The response's http status code.

Specifies which group-level metrics to start collecting. You can specify one or more of the following metrics:

• GroupMinSize

• GroupMaxSize

• GroupDesiredCapacity

• GroupInServiceInstances

• GroupPendingInstances

• GroupStandbyInstances

• GroupTerminatingInstances

• GroupTotalInstances

The instance weighting feature supports the following additional metrics:

• GroupInServiceCapacity

• GroupPendingCapacity

• GroupStandbyCapacity

• GroupTerminatingCapacity

• GroupTotalCapacity

The warm pools feature supports the following additional metrics:

• WarmPoolDesiredCapacity

• WarmPoolWarmedCapacity

• WarmPoolPendingCapacity

• WarmPoolTerminatingCapacity

• WarmPoolTotalCapacity

• GroupAndWarmPoolDesiredCapacity

• GroupAndWarmPoolTotalCapacity

If you omit this parameter, all metrics are enabled.

The name of the Auto Scaling group.

The granularity to associate with the metrics to collect. The only valid value is 1Minute.

The names of the process types.

The response's http status code.

The token for the next set of instances to return. (You received this token from a previous call.)

The maximum number of instances to return with this call. The maximum value is 50.

The name of the Auto Scaling group.

The token for the next set of items to return. (You received this token from a previous call.)

The instances that are currently in the warm pool.

The warm pool configuration details.

The response's http status code.

One or more tags.

The name of the Auto Scaling group.

The Amazon Resource Names (ARN) of the target groups. You can specify up to 10 target groups.

The response's http status code.

The names of one or more lifecycle hooks. If you omit this parameter, all lifecycle hooks are described.

The name of the Auto Scaling group.

The lifecycle hooks for the specified group.

The response's http status code.

One or more filters to limit the results based on specific tags.

The names of the Auto Scaling groups. By default, you can only specify up to 50 names. You can optionally increase this limit using the MaxRecords parameter.

If you omit this parameter, all Auto Scaling groups are described.

The token for the next set of items to return. (You received this token from a previous call.)

The maximum number of items to return with this call. The default value is 50 and the maximum value is 100.

A string that indicates that the response contains more items than can be returned in a single response. To receive additional items, specify this string for the NextToken value when requesting the next set of items. This value is null when there are no more items to return.

The response's http status code.

The groups.

The name of the Auto Scaling group.

The name of the action to delete.

Indicates whether Amazon EC2 Auto Scaling waits for the cooldown period to complete before initiating a scaling activity to set your Auto Scaling group to its new capacity. By default, Amazon EC2 Auto Scaling does not honor the cooldown period during manual scaling activities.

The name of the Auto Scaling group.

The desired capacity is the initial capacity of the Auto Scaling group after this operation completes and the capacity it attempts to maintain.

The name of the Auto Scaling group.

The names of the load balancers. You can specify up to 10 load balancers.

The response's http status code.

The notification types.

The response's http status code.

The earliest scheduled start time to return. If scheduled action names are provided, this parameter is ignored.

The token for the next set of items to return. (You received this token from a previous call.)

The name of the Auto Scaling group.

The maximum number of items to return with this call. The default value is 50 and the maximum value is 100.

The latest scheduled start time to return. If scheduled action names are provided, this parameter is ignored.

The names of one or more scheduled actions. If you omit this parameter, all scheduled actions are described. If you specify an unknown scheduled action, it is ignored with no error.

Array Members: Maximum number of 50 actions.

The scheduled actions.

A string that indicates that the response contains more items than can be returned in a single response. To receive additional items, specify this string for the NextToken value when requesting the next set of items. This value is null when there are no more items to return.

The response's http status code.

One or more tags.

The ID of the instance.

A universally unique identifier (UUID) that identifies a specific lifecycle action associated with an instance. Amazon EC2 Auto Scaling sends this token to the notification target you specified when you created the lifecycle hook.

The name of the lifecycle hook.

The name of the Auto Scaling group.

The action for the group to take. This parameter can be either CONTINUE or ABANDON.

The response's http status code.

The name of the Auto Scaling group.

The name or Amazon Resource Name (ARN) of the policy.

The IDs of the instances. You can specify up to 20 instances.

The name of the Auto Scaling group.

Reserved.

A policy or a list of policies that are used to select the instances to terminate. The policies are executed in the order that you list them. For more information, see Controlling which Auto Scaling instances terminate during scale in in the Amazon EC2 Auto Scaling User Guide.

The amount of time, in seconds, that Amazon EC2 Auto Scaling waits before checking the health status of an EC2 instance that has come into service. The default value is 0. For more information, see Health check grace period in the Amazon EC2 Auto Scaling User Guide.

Conditional: Required if you are adding an ELB health check.

The Amazon Resource Name (ARN) of the service-linked role that the Auto Scaling group uses to call other Amazon Web Services on your behalf. For more information, see Service-linked roles in the Amazon EC2 Auto Scaling User Guide.

Indicates whether newly launched instances are protected from termination by Amazon EC2 Auto Scaling when scaling in. For more information about preventing instances from terminating on scale in, see Instance scale-in protection in the Amazon EC2 Auto Scaling User Guide.

A comma-separated list of subnet IDs for a virtual private cloud (VPC). If you specify VPCZoneIdentifier with AvailabilityZones, the subnets that you specify for this parameter must reside in those Availability Zones.

The maximum amount of time, in seconds, that an instance can be in service. The default is null. If specified, the value must be either 0 or a number equal to or greater than 86,400 seconds (1 day). To clear a previously set value, specify a new value of 0. For more information, see Replacing Auto Scaling instances based on maximum instance lifetime in the Amazon EC2 Auto Scaling User Guide.

The amount of time, in seconds, after a scaling activity completes before another scaling activity can start. The default value is 300. This setting applies when using simple scaling policies, but not when using other scaling policies or scheduled scaling. For more information, see Scaling cooldowns for Amazon EC2 Auto Scaling in the Amazon EC2 Auto Scaling User Guide.

The maximum size of the Auto Scaling group.

With a mixed instances policy that uses instance weighting, Amazon EC2 Auto Scaling may need to go above MaxSize to meet your capacity requirements. In this event, Amazon EC2 Auto Scaling will never go above MaxSize by more than your largest instance weight (weights that define how many units each instance contributes to the desired capacity of the group).

One or more Availability Zones for the group.

The desired capacity is the initial capacity of the Auto Scaling group after this operation completes and the capacity it attempts to maintain. This number must be greater than or equal to the minimum size of the group and less than or equal to the maximum size of the group.

An embedded object that specifies a mixed instances policy. When you make changes to an existing policy, all optional properties are left unchanged if not specified. For more information, see Auto Scaling groups with multiple instance types and purchase options in the Amazon EC2 Auto Scaling User Guide.

The minimum size of the Auto Scaling group.

The name of the launch configuration. If you specify LaunchConfigurationName in your update request, you can't specify LaunchTemplate or MixedInstancesPolicy.

The service to use for the health checks. The valid values are EC2 and ELB. If you configure an Auto Scaling group to use ELB health checks, it considers the instance unhealthy if it fails either the EC2 status checks or the load balancer health checks.

The launch template and version to use to specify the updates. If you specify LaunchTemplate in your update request, you can't specify LaunchConfigurationName or MixedInstancesPolicy.

Enables or disables Capacity Rebalancing. For more information, see Amazon EC2 Auto Scaling Capacity Rebalancing in the Amazon EC2 Auto Scaling User Guide.

The name of an existing placement group into which to launch your instances, if any. A placement group is a logical grouping of instances within a single Availability Zone. You cannot specify multiple Availability Zones and a placement group. For more information, see Placement Groups in the Amazon EC2 User Guide for Linux Instances.

The name of the Auto Scaling group.

Specifies that the group is to be deleted along with all instances associated with the group, without waiting for all instances to be terminated. This parameter also deletes any outstanding lifecycle actions associated with the group.

The name of the Auto Scaling group.

Defines the action the Auto Scaling group should take when the lifecycle hook timeout elapses or if an unexpected failure occurs. This parameter can be either CONTINUE or ABANDON. The default value is ABANDON.

The maximum time, in seconds, that can elapse before the lifecycle hook times out. The range is from 30 to 7200 seconds. The default value is 3600 seconds (1 hour).

If the lifecycle hook times out, Amazon EC2 Auto Scaling performs the action that you specified in the DefaultResult parameter. You can prevent the lifecycle hook from timing out by calling the RecordLifecycleActionHeartbeat API.

Additional information that you want to include any time Amazon EC2 Auto Scaling sends a message to the notification target.

The ARN of the notification target that Amazon EC2 Auto Scaling uses to notify you when an instance is in the transition state for the lifecycle hook. This target can be either an SQS queue or an SNS topic.

If you specify an empty string, this overrides the current ARN.

This operation uses the JSON format when sending notifications to an Amazon SQS queue, and an email key-value pair format when sending notifications to an Amazon SNS topic.

When you specify a notification target, Amazon EC2 Auto Scaling sends it a test message. Test messages contain the following additional key-value pair: "Event": "autoscaling:TEST_NOTIFICATION".

The instance state to which you want to attach the lifecycle hook. The valid values are:

• autoscaling:EC2_INSTANCE_LAUNCHING
• autoscaling:EC2_INSTANCE_TERMINATING

Required for new lifecycle hooks, but optional when updating existing hooks.

The ARN of the IAM role that allows the Auto Scaling group to publish to the specified notification target, for example, an Amazon SNS topic or an Amazon SQS queue.

Required for new lifecycle hooks, but optional when updating existing hooks.

The name of the lifecycle hook.

The name of the Auto Scaling group.

The response's http status code.

The name of the Auto Scaling group.

One or more scheduled actions. The maximum number allowed is 50.

The names of the scheduled actions that could not be created or updated, including an error message.

The response's http status code.

The name of the lifecycle hook.

The name of the Auto Scaling group.

The response's http status code.

One or more of the following processes:

• Launch

• Terminate

• AddToLoadBalancer

• AlarmNotification

• AZRebalance

• HealthCheck

• InstanceRefresh

• ReplaceUnhealthy

• ScheduledActions

If you omit this parameter, all processes are specified.

The name of the Auto Scaling group.

Indicates whether Amazon EC2 Auto Scaling waits for the cooldown period to complete before executing the policy.

Valid only if the policy type is SimpleScaling. For more information, see Scaling cooldowns for Amazon EC2 Auto Scaling in the Amazon EC2 Auto Scaling User Guide.

The metric value to compare to BreachThreshold. This enables you to execute a policy of type StepScaling and determine which step adjustment to use. For example, if the breach threshold is 50 and you want to use a step adjustment with a lower bound of 0 and an upper bound of 10, you can set the metric value to 59.

If you specify a metric value that doesn't correspond to a step adjustment for the policy, the call returns an error.

Required if the policy type is StepScaling and not supported otherwise.

The name of the Auto Scaling group.

The breach threshold for the alarm.

Required if the policy type is StepScaling and not supported otherwise.

The name or ARN of the policy.

The name of the Auto Scaling group.

The name of the policy.

The inclusive start time of the time range for the forecast data to get. At most, the date and time can be one year before the current date and time.

The exclusive end time of the time range for the forecast data to get. The maximum time duration between the start and end time is 30 days.

Although this parameter can accept a date and time that is more than two days in the future, the availability of forecast data has limits. Amazon EC2 Auto Scaling only issues forecasts for periods of two days in advance.

The response's http status code.

The load forecast.

The capacity forecast.

The time the forecast was made.

The token for the next set of items to return. (You received this token from a previous call.)

The maximum number of items to return with this call. The default value is 50 and the maximum value is 100.

One or more instance refresh IDs.

The name of the Auto Scaling group.

A string that indicates that the response contains more items than can be returned in a single response. To receive additional items, specify this string for the NextToken value when requesting the next set of items. This value is null when there are no more items to return.

The instance refreshes for the specified group.

The response's http status code.

The current number of launch configurations for your account.

The current number of groups for your account.

The maximum number of groups allowed for your account. The default is 200 groups per Region.

The maximum number of launch configurations allowed for your account. The default is 200 launch configurations per Region.

The response's http status code.

The name of the Auto Scaling group.

The names of the load balancers. You can specify up to 10 load balancers.

The response's http status code.

The name of the Auto Scaling group.

The names of the scheduled actions to delete. The maximum number allowed is 50.

The names of the scheduled actions that could not be deleted, including an error message.

The response's http status code.

The ID of the instance.

Indicates whether terminating the instance also decrements the size of the Auto Scaling group.

A scaling activity.

The response's http status code.

The token for the next set of items to return. (You received this token from a previous call.)

The maximum number of items to return with this call. The default value is 100 and the maximum value is 100.

The name of the Auto Scaling group.

Information about the target groups.

A string that indicates that the response contains more items than can be returned in a single response. To receive additional items, specify this string for the NextToken value when requesting the next set of items. This value is null when there are no more items to return.

The response's http status code.

The date and time for this action to start, in YYYY-MM-DDThh:mm:ssZ format in UTC/GMT only and in quotes (for example, "2019-06-01T00:00:00Z").

If you specify Recurrence and StartTime, Amazon EC2 Auto Scaling performs the action at this time, and then performs the action based on the specified recurrence.

If you try to schedule your action in the past, Amazon EC2 Auto Scaling returns an error message.

This parameter is no longer used.

The maximum size of the Auto Scaling group.

The recurring schedule for this action. This format consists of five fields separated by white spaces: [Minute] [Hour] [Day_of_Month] [Month_of_Year] [Day_of_Week]. The value must be in quotes (for example, "30 0 1 1,6,12 *"). For more information about this format, see Crontab.

When StartTime and EndTime are specified with Recurrence, they form the boundaries of when the recurring action starts and stops.

Cron expressions use Universal Coordinated Time (UTC) by default.

The desired capacity is the initial capacity of the Auto Scaling group after the scheduled action runs and the capacity it attempts to maintain. It can scale beyond this capacity if you add more scaling conditions.

The minimum size of the Auto Scaling group.

The date and time for the recurring schedule to end, in UTC.

Specifies the time zone for a cron expression. If a time zone is not provided, UTC is used by default.

Valid values are the canonical names of the IANA time zones, derived from the IANA Time Zone Database (such as Etc/GMT+9 or Pacific/Tahiti). For more information, see https://en.wikipedia.org/wiki/List_of_tz_database_time_zones.

The name of the Auto Scaling group.

The name of this scaling action.

One or more instance IDs. You can specify up to 50 instances.

The name of the Auto Scaling group.

Indicates whether the instance is protected from termination by Amazon EC2 Auto Scaling when scaling in.

The response's http status code.

The names of one or more policies. If you omit this parameter, all policies are described. If a group name is provided, the results are limited to that group. If you specify an unknown policy name, it is ignored with no error.

Array Members: Maximum number of 50 items.

The token for the next set of items to return. (You received this token from a previous call.)

The name of the Auto Scaling group.

The maximum number of items to be returned with each call. The default value is 50 and the maximum value is 100.

One or more policy types. The valid values are SimpleScaling, StepScaling, TargetTrackingScaling, and PredictiveScaling.

A string that indicates that the response contains more items than can be returned in a single response. To receive additional items, specify this string for the NextToken value when requesting the next set of items. This value is null when there are no more items to return.

The scaling policies.

The response's http status code.

The launch configuration names. If you omit this parameter, all launch configurations are described.

Array Members: Maximum number of 50 items.

The token for the next set of items to return. (You received this token from a previous call.)

The maximum number of items to return with this call. The default value is 50 and the maximum value is 100.

A string that indicates that the response contains more items than can be returned in a single response. To receive additional items, specify this string for the NextToken value when requesting the next set of items. This value is null when there are no more items to return.

The response's http status code.

The launch configurations.

The token for the next set of items to return. (You received this token from a previous call.)

The name of the Auto Scaling group.

The maximum number of items to return with this call. The default value is 100 and the maximum value is 100.

Indicates whether to include scaling activity from deleted Auto Scaling groups.

The activity IDs of the desired scaling activities. If you omit this parameter, all activities for the past six weeks are described. If unknown activities are requested, they are ignored with no error. If you specify an Auto Scaling group, the results are limited to that group.

Array Members: Maximum number of 50 IDs.

A string that indicates that the response contains more items than can be returned in a single response. To receive additional items, specify this string for the NextToken value when requesting the next set of items. This value is null when there are no more items to return.

The response's http status code.

The scaling activities. Activities are sorted by start time. Activities still in progress are described first.

The name of the Auto Scaling group.

The token for the next set of items to return. (You received this token from a previous call.)

The maximum number of items to return with this call. The default value is 50 and the maximum value is 100.

A string that indicates that the response contains more items than can be returned in a single response. To receive additional items, specify this string for the NextToken value when requesting the next set of items. This value is null when there are no more items to return.

The response's http status code.

The notification configurations.

The lifecycle hook types.

The response's http status code.

The policy adjustment types.

The response's http status code.

The ID of the instance used to base the launch configuration on. If specified, Amazon EC2 Auto Scaling uses the configuration values from the specified instance to create a new launch configuration. To get the instance ID, use the Amazon EC2 DescribeInstances API operation. For more information, see Creating an Auto Scaling group using an EC2 instance in the Amazon EC2 Auto Scaling User Guide.

Reserved.

A policy or a list of policies that are used to select the instance to terminate. These policies are executed in the order that you list them. For more information, see Controlling which Auto Scaling instances terminate during scale in in the Amazon EC2 Auto Scaling User Guide.

The amount of time, in seconds, that Amazon EC2 Auto Scaling waits before checking the health status of an EC2 instance that has come into service. During this time, any health check failures for the instance are ignored. The default value is 0. For more information, see Health check grace period in the Amazon EC2 Auto Scaling User Guide.

Conditional: Required if you are adding an ELB health check.

The Amazon Resource Name (ARN) of the service-linked role that the Auto Scaling group uses to call other Amazon Web Services on your behalf. By default, Amazon EC2 Auto Scaling uses a service-linked role named AWSServiceRoleForAutoScaling, which it creates if it does not exist. For more information, see Service-linked roles in the Amazon EC2 Auto Scaling User Guide.

Indicates whether newly launched instances are protected from termination by Amazon EC2 Auto Scaling when scaling in. For more information about preventing instances from terminating on scale in, see Instance scale-in protection in the Amazon EC2 Auto Scaling User Guide.

A comma-separated list of subnet IDs for a virtual private cloud (VPC) where instances in the Auto Scaling group can be created. If you specify VPCZoneIdentifier with AvailabilityZones, the subnets that you specify for this parameter must reside in those Availability Zones.

Conditional: If your account supports EC2-Classic and VPC, this parameter is required to launch instances into a VPC.

The Amazon Resource Names (ARN) of the target groups to associate with the Auto Scaling group. Instances are registered as targets in a target group, and traffic is routed to the target group. For more information, see Elastic Load Balancing and Amazon EC2 Auto Scaling in the Amazon EC2 Auto Scaling User Guide.

The maximum amount of time, in seconds, that an instance can be in service. The default is null. If specified, the value must be either 0 or a number equal to or greater than 86,400 seconds (1 day). For more information, see Replacing Auto Scaling instances based on maximum instance lifetime in the Amazon EC2 Auto Scaling User Guide.

The amount of time, in seconds, after a scaling activity completes before another scaling activity can start. The default value is 300. This setting applies when using simple scaling policies, but not when using other scaling policies or scheduled scaling. For more information, see Scaling cooldowns for Amazon EC2 Auto Scaling in the Amazon EC2 Auto Scaling User Guide.

A list of Availability Zones where instances in the Auto Scaling group can be created. This parameter is optional if you specify one or more subnets for VPCZoneIdentifier.

Conditional: If your account supports EC2-Classic and VPC, this parameter is required to launch instances into EC2-Classic.

The desired capacity is the initial capacity of the Auto Scaling group at the time of its creation and the capacity it attempts to maintain. It can scale beyond this capacity if you configure auto scaling. This number must be greater than or equal to the minimum size of the group and less than or equal to the maximum size of the group. If you do not specify a desired capacity, the default is the minimum size of the group.

An embedded object that specifies a mixed instances policy. The required properties must be specified. If optional properties are unspecified, their default values are used.

The policy includes properties that not only define the distribution of On-Demand Instances and Spot Instances, the maximum price to pay for Spot Instances, and how the Auto Scaling group allocates instance types to fulfill On-Demand and Spot capacities, but also the properties that specify the instance configuration information—the launch template and instance types. The policy can also include a weight for each instance type and different launch templates for individual instance types. For more information, see Auto Scaling groups with multiple instance types and purchase options in the Amazon EC2 Auto Scaling User Guide.

The name of the launch configuration to use to launch instances.

Conditional: You must specify either a launch template (LaunchTemplate or MixedInstancesPolicy) or a launch configuration (LaunchConfigurationName or InstanceId).

One or more lifecycle hooks for the group, which specify actions to perform when Amazon EC2 Auto Scaling launches or terminates instances.

The service to use for the health checks. The valid values are EC2 (default) and ELB. If you configure an Auto Scaling group to use load balancer (ELB) health checks, it considers the instance unhealthy if it fails either the EC2 status checks or the load balancer health checks. For more information, see Health checks for Auto Scaling instances in the Amazon EC2 Auto Scaling User Guide.

Parameters used to specify the launch template and version to use to launch instances.

Conditional: You must specify either a launch template (LaunchTemplate or MixedInstancesPolicy) or a launch configuration (LaunchConfigurationName or InstanceId).

The launch template that is specified must be configured for use with an Auto Scaling group. For more information, see Creating a launch template for an Auto Scaling group in the Amazon EC2 Auto Scaling User Guide.

Indicates whether Capacity Rebalancing is enabled. Otherwise, Capacity Rebalancing is disabled. When you turn on Capacity Rebalancing, Amazon EC2 Auto Scaling attempts to launch a Spot Instance whenever Amazon EC2 notifies that a Spot Instance is at an elevated risk of interruption. After launching a new instance, it then terminates an old instance. For more information, see Amazon EC2 Auto Scaling Capacity Rebalancing in the Amazon EC2 Auto Scaling User Guide.

The name of an existing placement group into which to launch your instances, if any. A placement group is a logical grouping of instances within a single Availability Zone. You cannot specify multiple Availability Zones and a placement group. For more information, see Placement Groups in the Amazon EC2 User Guide for Linux Instances.

A list of Classic Load Balancers associated with this Auto Scaling group. For Application Load Balancers, Network Load Balancers, and Gateway Load Balancers, specify the TargetGroupARNs property instead.

One or more tags. You can tag your Auto Scaling group and propagate the tags to the Amazon EC2 instances it launches. Tags are not propagated to Amazon EBS volumes. To add tags to Amazon EBS volumes, specify the tags in a launch template but use caution. If the launch template specifies an instance tag with a key that is also specified for the Auto Scaling group, Amazon EC2 Auto Scaling overrides the value of that instance tag with the value specified by the Auto Scaling group. For more information, see Tagging Auto Scaling groups and instances in the Amazon EC2 Auto Scaling User Guide.

The name of the Auto Scaling group. This name must be unique per Region per account.

The minimum size of the group.

The maximum size of the group.

With a mixed instances policy that uses instance weighting, Amazon EC2 Auto Scaling may need to go above MaxSize to meet your capacity requirements. In this event, Amazon EC2 Auto Scaling will never go above MaxSize by more than your largest instance weight (weights that define how many units each instance contributes to the desired capacity of the group).

The ID of the instance to use to create the launch configuration. The new launch configuration derives attributes from the instance, except for the block device mapping.

To create a launch configuration with a block device mapping or override any other instance attributes, specify them as part of the same request.

For more information, see Creating a launch configuration using an EC2 instance in the Amazon EC2 Auto Scaling User Guide.

If you do not specify InstanceId, you must specify both ImageId and InstanceType.

For Auto Scaling groups that are running in a virtual private cloud (VPC), specifies whether to assign a public IP address to the group's instances. If you specify true, each instance in the Auto Scaling group receives a unique public IP address. For more information, see Launching Auto Scaling instances in a VPC in the Amazon EC2 Auto Scaling User Guide.

If you specify this parameter, you must specify at least one subnet for VPCZoneIdentifier when you create your group.

If the instance is launched into a default subnet, the default is to assign a public IP address, unless you disabled the option to assign a public IP address on the subnet. If the instance is launched into a nondefault subnet, the default is not to assign a public IP address, unless you enabled the option to assign a public IP address on the subnet.

A list that contains the security groups to assign to the instances in the Auto Scaling group.

EC2-VPC

Specify the security group IDs. For more information, see Security Groups for Your VPC in the Amazon Virtual Private Cloud User Guide.

EC2-Classic

Specify either the security group names or the security group IDs. For more information, see Amazon EC2 Security Groups in the Amazon EC2 User Guide for Linux Instances.

The maximum hourly price to be paid for any Spot Instance launched to fulfill the request. Spot Instances are launched when the price you specify exceeds the current Spot price. For more information, see Requesting Spot Instances in the Amazon EC2 Auto Scaling User Guide.

When you change your maximum price by creating a new launch configuration, running instances will continue to run as long as the maximum price for those running instances is higher than the current Spot price.

Controls whether instances in this group are launched with detailed (true) or basic (false) monitoring.

The default value is true (enabled).

When detailed monitoring is enabled, Amazon CloudWatch generates metrics every minute and your account is charged a fee. When you disable detailed monitoring, CloudWatch generates metrics every 5 minutes. For more information, see Configure Monitoring for Auto Scaling Instances in the Amazon EC2 Auto Scaling User Guide.

The name of the key pair. For more information, see Amazon EC2 Key Pairs in the Amazon EC2 User Guide for Linux Instances.

The IDs of one or more security groups for the specified ClassicLink-enabled VPC. For more information, see ClassicLink in the Amazon EC2 User Guide for Linux Instances and Linking EC2-Classic instances to a VPC in the Amazon EC2 Auto Scaling User Guide.

If you specify the ClassicLinkVPCId parameter, you must specify this parameter.

The ID of the RAM disk to select.

The ID of the kernel associated with the AMI.

Specifies the instance type of the EC2 instance.

For information about available instance types, see Available Instance Types in the Amazon EC2 User Guide for Linux Instances.

If you do not specify InstanceId, you must specify InstanceType.

Specifies whether the launch configuration is optimized for EBS I/O (true) or not (false). The optimization provides dedicated throughput to Amazon EBS and an optimized configuration stack to provide optimal I/O performance. This optimization is not available with all instance types. Additional fees are incurred when you enable EBS optimization for an instance type that is not EBS-optimized by default. For more information, see Amazon EBS-optimized instances in the Amazon EC2 User Guide for Linux Instances.

The default value is false.

The user data to make available to the launched EC2 instances. For more information, see Instance metadata and user data (Linux) and Instance metadata and user data (Windows). If you are using a command line tool, base64-encoding is performed for you, and you can load the text from a file. Otherwise, you must provide base64-encoded text. User data is limited to 16 KB.

The ID of a ClassicLink-enabled VPC to link your EC2-Classic instances to. For more information, see ClassicLink in the Amazon EC2 User Guide for Linux Instances and Linking EC2-Classic instances to a VPC in the Amazon EC2 Auto Scaling User Guide.

This parameter can only be used if you are launching EC2-Classic instances.

The name or the Amazon Resource Name (ARN) of the instance profile associated with the IAM role for the instance. The instance profile contains the IAM role.

For more information, see IAM role for applications that run on Amazon EC2 instances in the Amazon EC2 Auto Scaling User Guide.

The ID of the Amazon Machine Image (AMI) that was assigned during registration. For more information, see Finding an AMI in the Amazon EC2 User Guide for Linux Instances.

If you do not specify InstanceId, you must specify ImageId.

The metadata options for the instances. For more information, see Configuring the Instance Metadata Options in the Amazon EC2 Auto Scaling User Guide.

The tenancy of the instance. An instance with dedicated tenancy runs on isolated, single-tenant hardware and can only be launched into a VPC.

To launch dedicated instances into a shared tenancy VPC (a VPC with the instance placement tenancy attribute set to default), you must set the value of this parameter to dedicated.

If you specify PlacementTenancy, you must specify at least one subnet for VPCZoneIdentifier when you create your group.

For more information, see Configuring instance tenancy with Amazon EC2 Auto Scaling in the Amazon EC2 Auto Scaling User Guide.

Valid Values: default | dedicated

A block device mapping, which specifies the block devices for the instance. You can specify virtual devices and EBS volumes. For more information, see Block Device Mapping in the Amazon EC2 User Guide for Linux Instances.

The name of the launch configuration. This name must be unique per Region per account.

A value between 0 and 100 that indicates the progress of the activity.

A friendly, more verbose description of the activity status.

The state of the Auto Scaling group, which is either InService or Deleted.

The end time of the activity.

The details about the activity.

The Amazon Resource Name (ARN) of the Auto Scaling group.

A friendly, more verbose description of the activity.

The ID of the activity.

The name of the Auto Scaling group.

The reason the activity began.

The start time of the activity.

The current status of the activity.

The policy adjustment type. The valid values are ChangeInCapacity, ExactCapacity, and PercentChangeInCapacity.

The name of the alarm.

The Amazon Resource Name (ARN) of the alarm.

The current state of the group when the DeleteAutoScalingGroup operation is in progress.

Reserved.

The termination policies for the group.

The amount of time, in seconds, that Amazon EC2 Auto Scaling waits before checking the health status of an EC2 instance that has come into service.

The Amazon Resource Name (ARN) of the service-linked role that the Auto Scaling group uses to call other Amazon Web Services on your behalf.

Indicates whether newly launched instances are protected from termination by Amazon EC2 Auto Scaling when scaling in.

One or more subnet IDs, if applicable, separated by commas.

The Amazon Resource Names (ARN) of the target groups for your load balancer.

The maximum amount of time, in seconds, that an instance can be in service.

Valid Range: Minimum value of 0.

The mixed instances policy for the group.

The metrics enabled for the group.

The name of the associated launch configuration.

The EC2 instances associated with the group.

The launch template for the group.

The warm pool for the group.

Indicates whether Capacity Rebalancing is enabled.

The Amazon Resource Name (ARN) of the Auto Scaling group.

The predicted capacity of the group when it has a predictive scaling policy.

The current size of the warm pool.

The name of the placement group into which to launch your instances, if any.

The suspended processes associated with the group.