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[ aws . autoscaling ]

describe-instance-refreshes

Description

Gets information about the instance refreshes for the specified Auto Scaling group.

This operation is part of the instance refresh feature in Amazon EC2 Auto Scaling, which helps you update instances in your Auto Scaling group after you make configuration changes.

To help you determine the status of an instance refresh, this operation returns information about the instance refreshes you previously initiated, including their status, end time, the percentage of the instance refresh that is complete, and the number of instances remaining to update before the instance refresh is complete.

The following are the possible statuses:

  • Pending - The request was created, but the operation has not started.
  • InProgress - The operation is in progress.
  • Successful - The operation completed successfully.
  • Failed - The operation failed to complete. You can troubleshoot using the status reason and the scaling activities.
  • Cancelling - An ongoing operation is being cancelled. Cancellation does not roll back any replacements that have already been completed, but it prevents new replacements from being started.
  • Cancelled - The operation is cancelled.

See also: AWS API Documentation

Synopsis

  describe-instance-refreshes
--auto-scaling-group-name <value>
[--instance-refresh-ids <value>]
[--next-token <value>]
[--max-records <value>]
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]
[--debug]
[--endpoint-url <value>]
[--no-verify-ssl]
[--no-paginate]
[--output <value>]
[--query <value>]
[--profile <value>]
[--region <value>]
[--version <value>]
[--color <value>]
[--no-sign-request]
[--ca-bundle <value>]
[--cli-read-timeout <value>]
[--cli-connect-timeout <value>]

Options

--auto-scaling-group-name (string)

The name of the Auto Scaling group.

--instance-refresh-ids (list)

One or more instance refresh IDs.

(string)

Syntax:

"string" "string" ...

--next-token (string)

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

--max-records (integer)

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

--cli-input-json (string) Performs service operation based on the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, the CLI values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally.

--generate-cli-skeleton (string) Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value input, prints a sample input JSON that can be used as an argument for --cli-input-json. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command.

Global Options

--debug (boolean)

Turn on debug logging.

--endpoint-url (string)

Override command's default URL with the given URL.

--no-verify-ssl (boolean)

By default, the AWS CLI uses SSL when communicating with AWS services. For each SSL connection, the AWS CLI will verify SSL certificates. This option overrides the default behavior of verifying SSL certificates.

--no-paginate (boolean)

Disable automatic pagination.

--output (string)

The formatting style for command output.

  • json
  • text
  • table

--query (string)

A JMESPath query to use in filtering the response data.

--profile (string)

Use a specific profile from your credential file.

--region (string)

The region to use. Overrides config/env settings.

--version (string)

Display the version of this tool.

--color (string)

Turn on/off color output.

  • on
  • off
  • auto

--no-sign-request (boolean)

Do not sign requests. Credentials will not be loaded if this argument is provided.

--ca-bundle (string)

The CA certificate bundle to use when verifying SSL certificates. Overrides config/env settings.

--cli-read-timeout (int)

The maximum socket read time in seconds. If the value is set to 0, the socket read will be blocking and not timeout. The default value is 60 seconds.

--cli-connect-timeout (int)

The maximum socket connect time in seconds. If the value is set to 0, the socket connect will be blocking and not timeout. The default value is 60 seconds.

Examples

Note

To use the following examples, you must have the AWS CLI installed and configured. See the Getting started guide in the AWS CLI User Guide for more information.

Unless otherwise stated, all examples have unix-like quotation rules. These examples will need to be adapted to your terminal's quoting rules. See Using quotation marks with strings in the AWS CLI User Guide .

To list instance refreshes

The following describe-instance-refreshes example returns a description of all instance refresh requests for the specified Auto Scaling group, including the status message and (if available) the status reason.

aws autoscaling describe-instance-refreshes \
    --auto-scaling-group-name my-asg

Output:

{
    "InstanceRefreshes": [
        {
            "InstanceRefreshId": "08b91cf7-8fa6-48af-b6a6-d227f40f1b9b",
            "AutoScalingGroupName": "my-asg",
            "Status": "InProgress",
            "StartTime": "2020-06-02T18:11:27Z",
            "PercentageComplete": 0,
            "InstancesToUpdate": 5
        },
        {
            "InstanceRefreshId": "dd7728d0-5bc4-4575-96a3-1b2c52bf8bb1",
            "AutoScalingGroupName": "my-asg",
            "Status": "Successful",
            "StartTime": "2020-06-02T16:43:19Z",
            "EndTime": "2020-06-02T16:53:37Z",
            "PercentageComplete": 100,
            "InstancesToUpdate": 0
        }
    ]
}

For more information, see Replacing Auto Scaling instances based on an instance refresh in the Amazon EC2 Auto Scaling User Guide.

Output

InstanceRefreshes -> (list)

The instance refreshes for the specified group, sorted by creation timestamp in descending order.

(structure)

Describes an instance refresh for an Auto Scaling group.

InstanceRefreshId -> (string)

The instance refresh ID.

AutoScalingGroupName -> (string)

The name of the Auto Scaling group.

Status -> (string)

The current status for the instance refresh operation:

  • Pending - The request was created, but the operation has not started.
  • InProgress - The operation is in progress.
  • Successful - The operation completed successfully.
  • Failed - The operation failed to complete. You can troubleshoot using the status reason and the scaling activities.
  • Cancelling - An ongoing operation is being cancelled. Cancellation does not roll back any replacements that have already been completed, but it prevents new replacements from being started.
  • Cancelled - The operation is cancelled.

StatusReason -> (string)

Provides more details about the current status of the instance refresh.

StartTime -> (timestamp)

The date and time at which the instance refresh began.

EndTime -> (timestamp)

The date and time at which the instance refresh ended.

PercentageComplete -> (integer)

The percentage of the instance refresh that is complete. For each instance replacement, Amazon EC2 Auto Scaling tracks the instance's health status and warm-up time. When the instance's health status changes to healthy and the specified warm-up time passes, the instance is considered updated and is added to the percentage complete.

InstancesToUpdate -> (integer)

The number of instances remaining to update before the instance refresh is complete.

ProgressDetails -> (structure)

Additional progress details for an Auto Scaling group that has a warm pool.

LivePoolProgress -> (structure)

Indicates the progress of an instance refresh on instances that are in the Auto Scaling group.

PercentageComplete -> (integer)

The percentage of instances in the Auto Scaling group that have been replaced. For each instance replacement, Amazon EC2 Auto Scaling tracks the instance's health status and warm-up time. When the instance's health status changes to healthy and the specified warm-up time passes, the instance is considered updated and is added to the percentage complete.

InstancesToUpdate -> (integer)

The number of instances remaining to update.

WarmPoolProgress -> (structure)

Indicates the progress of an instance refresh on instances that are in the warm pool.

PercentageComplete -> (integer)

The percentage of instances in the warm pool that have been replaced. For each instance replacement, Amazon EC2 Auto Scaling tracks the instance's health status and warm-up time. When the instance's health status changes to healthy and the specified warm-up time passes, the instance is considered updated and is added to the percentage complete.

InstancesToUpdate -> (integer)

The number of instances remaining to update.

Preferences -> (structure)

Describes the preferences for an instance refresh.

MinHealthyPercentage -> (integer)

The amount of capacity in the Auto Scaling group that must pass your group's health checks to allow the operation to continue. The value is expressed as a percentage of the desired capacity of the Auto Scaling group (rounded up to the nearest integer). The default is 90 .

Setting the minimum healthy percentage to 100 percent limits the rate of replacement to one instance at a time. In contrast, setting it to 0 percent has the effect of replacing all instances at the same time.

InstanceWarmup -> (integer)

Not needed if the default instance warmup is defined for the group.

The duration of the instance warmup, in seconds.

Note

The default is to use the value for the default instance warmup defined for the group. If default instance warmup is null, then InstanceWarmup falls back to the value of the health check grace period.

CheckpointPercentages -> (list)

Threshold values for each checkpoint in ascending order. Each number must be unique. To replace all instances in the Auto Scaling group, the last number in the array must be 100 .

For usage examples, see Adding checkpoints to an instance refresh in the Amazon EC2 Auto Scaling User Guide .

(integer)

CheckpointDelay -> (integer)

The amount of time, in seconds, to wait after a checkpoint before continuing. This property is optional, but if you specify a value for it, you must also specify a value for CheckpointPercentages . If you specify a value for CheckpointPercentages and not for CheckpointDelay , the CheckpointDelay defaults to 3600 (1 hour).

SkipMatching -> (boolean)

A boolean value that indicates whether skip matching is enabled. If true, then Amazon EC2 Auto Scaling skips replacing instances that match the desired configuration. If no desired configuration is specified, then it skips replacing instances that have the same configuration that is already set on the group. The default is false .

DesiredConfiguration -> (structure)

Describes the specific update you want to deploy.

LaunchTemplate -> (structure)

Describes the launch template and the version of the launch template that Amazon EC2 Auto Scaling uses to launch Amazon EC2 instances. For more information about launch templates, see Launch templates in the Amazon EC2 Auto Scaling User Guide .

LaunchTemplateId -> (string)

The ID of the launch template. To get the template ID, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.

Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .

LaunchTemplateName -> (string)

The name of the launch template. To get the template name, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.

Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .

Version -> (string)

The version number, $Latest , or $Default . To get the version number, use the Amazon EC2 DescribeLaunchTemplateVersions API operation. New launch template versions can be created using the Amazon EC2 CreateLaunchTemplateVersion API. If the value is $Latest , Amazon EC2 Auto Scaling selects the latest version of the launch template when launching instances. If the value is $Default , Amazon EC2 Auto Scaling selects the default version of the launch template when launching instances. The default value is $Default .

MixedInstancesPolicy -> (structure)

Use this structure to launch multiple instance types and On-Demand Instances and Spot Instances within a single Auto Scaling group.

A mixed instances policy contains information that Amazon EC2 Auto Scaling can use to launch instances and help optimize your costs. For more information, see Auto Scaling groups with multiple instance types and purchase options in the Amazon EC2 Auto Scaling User Guide .

LaunchTemplate -> (structure)

One or more launch templates and the instance types (overrides) that are used to launch EC2 instances to fulfill On-Demand and Spot capacities.

LaunchTemplateSpecification -> (structure)

The launch template.

LaunchTemplateId -> (string)

The ID of the launch template. To get the template ID, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.

Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .

LaunchTemplateName -> (string)

The name of the launch template. To get the template name, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.

Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .

Version -> (string)

The version number, $Latest , or $Default . To get the version number, use the Amazon EC2 DescribeLaunchTemplateVersions API operation. New launch template versions can be created using the Amazon EC2 CreateLaunchTemplateVersion API. If the value is $Latest , Amazon EC2 Auto Scaling selects the latest version of the launch template when launching instances. If the value is $Default , Amazon EC2 Auto Scaling selects the default version of the launch template when launching instances. The default value is $Default .

Overrides -> (list)

Any properties that you specify override the same properties in the launch template.

(structure)

Use this structure to let Amazon EC2 Auto Scaling do the following when the Auto Scaling group has a mixed instances policy:

  • Override the instance type that is specified in the launch template.
  • Use multiple instance types.

Specify the instance types that you want, or define your instance requirements instead and let Amazon EC2 Auto Scaling provision the available instance types that meet your requirements. This can provide Amazon EC2 Auto Scaling with a larger selection of instance types to choose from when fulfilling Spot and On-Demand capacities. You can view which instance types are matched before you apply the instance requirements to your Auto Scaling group.

After you define your instance requirements, you don't have to keep updating these settings to get new EC2 instance types automatically. Amazon EC2 Auto Scaling uses the instance requirements of the Auto Scaling group to determine whether a new EC2 instance type can be used.

InstanceType -> (string)

The instance type, such as m3.xlarge . You must specify an instance type that is supported in your requested Region and Availability Zones. For more information, see Instance types in the Amazon Elastic Compute Cloud User Guide .

You can specify up to 40 instance types per Auto Scaling group.

WeightedCapacity -> (string)

If you provide a list of instance types to use, you can specify the number of capacity units provided by each instance type in terms of virtual CPUs, memory, storage, throughput, or other relative performance characteristic. When a Spot or On-Demand Instance is launched, the capacity units count toward the desired capacity. Amazon EC2 Auto Scaling launches instances until the desired capacity is totally fulfilled, even if this results in an overage. For example, if there are two units remaining to fulfill capacity, and Amazon EC2 Auto Scaling can only launch an instance with a WeightedCapacity of five units, the instance is launched, and the desired capacity is exceeded by three units. For more information, see Configuring instance weighting for Amazon EC2 Auto Scaling in the Amazon EC2 Auto Scaling User Guide . Value must be in the range of 1–999.

If you specify a value for WeightedCapacity for one instance type, you must specify a value for WeightedCapacity for all of them.

Warning

Every Auto Scaling group has three size parameters (DesiredCapacity , MaxSize , and MinSize ). Usually, you set these sizes based on a specific number of instances. However, if you configure a mixed instances policy that defines weights for the instance types, you must specify these sizes with the same units that you use for weighting instances.

LaunchTemplateSpecification -> (structure)

Provides a launch template for the specified instance type or set of instance requirements. For example, some instance types might require a launch template with a different AMI. If not provided, Amazon EC2 Auto Scaling uses the launch template that's specified in the LaunchTemplate definition. For more information, see Specifying a different launch template for an instance type in the Amazon EC2 Auto Scaling User Guide .

You can specify up to 20 launch templates per Auto Scaling group. The launch templates specified in the overrides and in the LaunchTemplate definition count towards this limit.

LaunchTemplateId -> (string)

The ID of the launch template. To get the template ID, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.

Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .

LaunchTemplateName -> (string)

The name of the launch template. To get the template name, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.

Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .

Version -> (string)

The version number, $Latest , or $Default . To get the version number, use the Amazon EC2 DescribeLaunchTemplateVersions API operation. New launch template versions can be created using the Amazon EC2 CreateLaunchTemplateVersion API. If the value is $Latest , Amazon EC2 Auto Scaling selects the latest version of the launch template when launching instances. If the value is $Default , Amazon EC2 Auto Scaling selects the default version of the launch template when launching instances. The default value is $Default .

InstanceRequirements -> (structure)

The instance requirements. Amazon EC2 Auto Scaling uses your specified requirements to identify instance types. Then, it uses your On-Demand and Spot allocation strategies to launch instances from these instance types.

You can specify up to four separate sets of instance requirements per Auto Scaling group. This is useful for provisioning instances from different Amazon Machine Images (AMIs) in the same Auto Scaling group. To do this, create the AMIs and create a new launch template for each AMI. Then, create a compatible set of instance requirements for each launch template.

Note

If you specify InstanceRequirements , you can't specify InstanceType .

VCpuCount -> (structure)

The minimum and maximum number of vCPUs for an instance type.

Min -> (integer)

The minimum number of vCPUs.

Max -> (integer)

The maximum number of vCPUs.

MemoryMiB -> (structure)

The minimum and maximum instance memory size for an instance type, in MiB.

Min -> (integer)

The memory minimum in MiB.

Max -> (integer)

The memory maximum in MiB.

CpuManufacturers -> (list)

Lists which specific CPU manufacturers to include.

  • For instance types with Intel CPUs, specify intel .
  • For instance types with AMD CPUs, specify amd .
  • For instance types with Amazon Web Services CPUs, specify amazon-web-services .

Note

Don't confuse the CPU hardware manufacturer with the CPU hardware architecture. Instances will be launched with a compatible CPU architecture based on the Amazon Machine Image (AMI) that you specify in your launch template.

Default: Any manufacturer

(string)

MemoryGiBPerVCpu -> (structure)

The minimum and maximum amount of memory per vCPU for an instance type, in GiB.

Default: No minimum or maximum limits

Min -> (double)

The memory minimum in GiB.

Max -> (double)

The memory maximum in GiB.

ExcludedInstanceTypes -> (list)

The instance types to exclude. You can use strings with one or more wild cards, represented by an asterisk (* ), to exclude an instance family, type, size, or generation. The following are examples: m5.8xlarge , c5*.* , m5a.* , r* , *3* .

For example, if you specify c5* , you are excluding the entire C5 instance family, which includes all C5a and C5n instance types. If you specify m5a.* , Amazon EC2 Auto Scaling will exclude all the M5a instance types, but not the M5n instance types.

Note

If you specify ExcludedInstanceTypes , you can't specify AllowedInstanceTypes .

Default: No excluded instance types

(string)

InstanceGenerations -> (list)

Indicates whether current or previous generation instance types are included.

  • For current generation instance types, specify current . The current generation includes EC2 instance types currently recommended for use. This typically includes the latest two to three generations in each instance family. For more information, see Instance types in the Amazon EC2 User Guide for Linux Instances .
  • For previous generation instance types, specify previous .

Default: Any current or previous generation

(string)

SpotMaxPricePercentageOverLowestPrice -> (integer)

The price protection threshold for Spot Instances. This is the maximum you’ll pay for a Spot Instance, expressed as a percentage higher than the least expensive current generation M, C, or R instance type with your specified attributes. When Amazon EC2 Auto Scaling selects instance types with your attributes, we will exclude instance types whose price is higher than your threshold. The parameter accepts an integer, which Amazon EC2 Auto Scaling interprets as a percentage. To turn off price protection, specify a high value, such as 999999 .

If you set DesiredCapacityType to vcpu or memory-mib , the price protection threshold is applied based on the per vCPU or per memory price instead of the per instance price.

Default: 100

OnDemandMaxPricePercentageOverLowestPrice -> (integer)

The price protection threshold for On-Demand Instances. This is the maximum you’ll pay for an On-Demand Instance, expressed as a percentage higher than the least expensive current generation M, C, or R instance type with your specified attributes. When Amazon EC2 Auto Scaling selects instance types with your attributes, we will exclude instance types whose price is higher than your threshold. The parameter accepts an integer, which Amazon EC2 Auto Scaling interprets as a percentage. To turn off price protection, specify a high value, such as 999999 .

If you set DesiredCapacityType to vcpu or memory-mib , the price protection threshold is applied based on the per vCPU or per memory price instead of the per instance price.

Default: 20

BareMetal -> (string)

Indicates whether bare metal instance types are included, excluded, or required.

Default: excluded

BurstablePerformance -> (string)

Indicates whether burstable performance instance types are included, excluded, or required. For more information, see Burstable performance instances in the Amazon EC2 User Guide for Linux Instances .

Default: excluded

RequireHibernateSupport -> (boolean)

Indicates whether instance types must provide On-Demand Instance hibernation support.

Default: false

NetworkInterfaceCount -> (structure)

The minimum and maximum number of network interfaces for an instance type.

Default: No minimum or maximum limits

Min -> (integer)

The minimum number of network interfaces.

Max -> (integer)

The maximum number of network interfaces.

LocalStorage -> (string)

Indicates whether instance types with instance store volumes are included, excluded, or required. For more information, see Amazon EC2 instance store in the Amazon EC2 User Guide for Linux Instances .

Default: included

LocalStorageTypes -> (list)

Indicates the type of local storage that is required.

  • For instance types with hard disk drive (HDD) storage, specify hdd .
  • For instance types with solid state drive (SSD) storage, specify ssd .

Default: Any local storage type

(string)

TotalLocalStorageGB -> (structure)

The minimum and maximum total local storage size for an instance type, in GB.

Default: No minimum or maximum limits

Min -> (double)

The storage minimum in GB.

Max -> (double)

The storage maximum in GB.

BaselineEbsBandwidthMbps -> (structure)

The minimum and maximum baseline bandwidth performance for an instance type, in Mbps. For more information, see Amazon EBS–optimized instances in the Amazon EC2 User Guide for Linux Instances .

Default: No minimum or maximum limits

Min -> (integer)

The minimum value in Mbps.

Max -> (integer)

The maximum value in Mbps.

AcceleratorTypes -> (list)

Lists the accelerator types that must be on an instance type.

  • For instance types with GPU accelerators, specify gpu .
  • For instance types with FPGA accelerators, specify fpga .
  • For instance types with inference accelerators, specify inference .

Default: Any accelerator type

(string)

AcceleratorCount -> (structure)

The minimum and maximum number of accelerators (GPUs, FPGAs, or Amazon Web Services Inferentia chips) for an instance type.

To exclude accelerator-enabled instance types, set Max to 0 .

Default: No minimum or maximum limits

Min -> (integer)

The minimum value.

Max -> (integer)

The maximum value.

AcceleratorManufacturers -> (list)

Indicates whether instance types must have accelerators by specific manufacturers.

  • For instance types with NVIDIA devices, specify nvidia .
  • For instance types with AMD devices, specify amd .
  • For instance types with Amazon Web Services devices, specify amazon-web-services .
  • For instance types with Xilinx devices, specify xilinx .

Default: Any manufacturer

(string)

AcceleratorNames -> (list)

Lists the accelerators that must be on an instance type.

  • For instance types with NVIDIA A100 GPUs, specify a100 .
  • For instance types with NVIDIA V100 GPUs, specify v100 .
  • For instance types with NVIDIA K80 GPUs, specify k80 .
  • For instance types with NVIDIA T4 GPUs, specify t4 .
  • For instance types with NVIDIA M60 GPUs, specify m60 .
  • For instance types with AMD Radeon Pro V520 GPUs, specify radeon-pro-v520 .
  • For instance types with Xilinx VU9P FPGAs, specify vu9p .

Default: Any accelerator

(string)

AcceleratorTotalMemoryMiB -> (structure)

The minimum and maximum total memory size for the accelerators on an instance type, in MiB.

Default: No minimum or maximum limits

Min -> (integer)

The memory minimum in MiB.

Max -> (integer)

The memory maximum in MiB.

NetworkBandwidthGbps -> (structure)

The minimum and maximum amount of network bandwidth, in gigabits per second (Gbps).

Default: No minimum or maximum limits

Min -> (double)

The minimum amount of network bandwidth, in gigabits per second (Gbps).

Max -> (double)

The maximum amount of network bandwidth, in gigabits per second (Gbps).

AllowedInstanceTypes -> (list)

The instance types to apply your specified attributes against. All other instance types are ignored, even if they match your specified attributes.

You can use strings with one or more wild cards, represented by an asterisk (* ), to allow an instance type, size, or generation. The following are examples: m5.8xlarge , c5*.* , m5a.* , r* , *3* .

For example, if you specify c5* , Amazon EC2 Auto Scaling will allow the entire C5 instance family, which includes all C5a and C5n instance types. If you specify m5a.* , Amazon EC2 Auto Scaling will allow all the M5a instance types, but not the M5n instance types.

Note

If you specify AllowedInstanceTypes , you can't specify ExcludedInstanceTypes .

Default: All instance types

(string)

InstancesDistribution -> (structure)

The instances distribution.

OnDemandAllocationStrategy -> (string)

The allocation strategy to apply to your On-Demand Instances when they are launched. Possible instance types are determined by the launch template overrides that you specify.

The following lists the valid values:

lowest-price

Uses price to determine which instance types are the highest priority, launching the lowest priced instance types within an Availability Zone first. This is the default value for Auto Scaling groups that specify InstanceRequirements .

prioritized

You set the order of instance types for the launch template overrides from highest to lowest priority (from first to last in the list). Amazon EC2 Auto Scaling launches your highest priority instance types first. If all your On-Demand capacity cannot be fulfilled using your highest priority instance type, then Amazon EC2 Auto Scaling launches the remaining capacity using the second priority instance type, and so on. This is the default value for Auto Scaling groups that don't specify InstanceRequirements and cannot be used for groups that do.

OnDemandBaseCapacity -> (integer)

The minimum amount of the Auto Scaling group's capacity that must be fulfilled by On-Demand Instances. This base portion is launched first as your group scales.

This number has the same unit of measurement as the group's desired capacity. If you change the default unit of measurement (number of instances) by specifying weighted capacity values in your launch template overrides list, or by changing the default desired capacity type setting of the group, you must specify this number using the same unit of measurement.

Default: 0

OnDemandPercentageAboveBaseCapacity -> (integer)

Controls the percentages of On-Demand Instances and Spot Instances for your additional capacity beyond OnDemandBaseCapacity . Expressed as a number (for example, 20 specifies 20% On-Demand Instances, 80% Spot Instances). If set to 100, only On-Demand Instances are used.

Default: 100

SpotAllocationStrategy -> (string)

The allocation strategy to apply to your Spot Instances when they are launched. Possible instance types are determined by the launch template overrides that you specify.

The following lists the valid values:

capacity-optimized

Requests Spot Instances using pools that are optimally chosen based on the available Spot capacity. This strategy has the lowest risk of interruption. To give certain instance types a higher chance of launching first, use capacity-optimized-prioritized .

capacity-optimized-prioritized

You set the order of instance types for the launch template overrides from highest to lowest priority (from first to last in the list). Amazon EC2 Auto Scaling honors the instance type priorities on a best effort basis but optimizes for capacity first. Note that if the On-Demand allocation strategy is set to prioritized , the same priority is applied when fulfilling On-Demand capacity. This is not a valid value for Auto Scaling groups that specify InstanceRequirements .

lowest-price

Requests Spot Instances using the lowest priced pools within an Availability Zone, across the number of Spot pools that you specify for the SpotInstancePools property. To ensure that your desired capacity is met, you might receive Spot Instances from several pools. This is the default value, but it might lead to high interruption rates because this strategy only considers instance price and not available capacity.

price-capacity-optimized (recommended)

Amazon EC2 Auto Scaling identifies the pools with the highest capacity availability for the number of instances that are launching. This means that we will request Spot Instances from the pools that we believe have the lowest chance of interruption in the near term. Amazon EC2 Auto Scaling then requests Spot Instances from the lowest priced of these pools.

SpotInstancePools -> (integer)

The number of Spot Instance pools across which to allocate your Spot Instances. The Spot pools are determined from the different instance types in the overrides. Valid only when the SpotAllocationStrategy is lowest-price . Value must be in the range of 1–20.

Default: 2

SpotMaxPrice -> (string)

The maximum price per unit hour that you are willing to pay for a Spot Instance. If your maximum price is lower than the Spot price for the instance types that you selected, your Spot Instances are not launched. We do not recommend specifying a maximum price because it can lead to increased interruptions. When Spot Instances launch, you pay the current Spot price. To remove a maximum price that you previously set, include the property but specify an empty string ("") for the value.

Warning

If you specify a maximum price, your instances will be interrupted more frequently than if you do not specify one.

Valid Range: Minimum value of 0.001

NextToken -> (string)

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.