:doc:`AutoScaling <../../autoscaling>` / Client / update_auto_scaling_group

*************************
update_auto_scaling_group
*************************



.. py:method:: AutoScaling.Client.update_auto_scaling_group(**kwargs)

  

  **We strongly recommend that all Auto Scaling groups use launch templates to ensure full functionality for Amazon EC2 Auto Scaling and Amazon EC2.**

   

  Updates the configuration for the specified Auto Scaling group.

   

  To update an Auto Scaling group, specify the name of the group and the property that you want to change. Any properties that you don't specify are not changed by this update request. The new settings take effect on any scaling activities after this call returns.

   

  If you associate a new launch configuration or template with an Auto Scaling group, all new instances will get the updated configuration. Existing instances continue to run with the configuration that they were originally launched with. When you update a group to specify a mixed instances policy instead of a launch configuration or template, existing instances may be replaced to match the new purchasing options that you specified in the policy. For example, if the group currently has 100% On-Demand capacity and the policy specifies 50% Spot capacity, this means that half of your instances will be gradually terminated and relaunched as Spot Instances. When replacing instances, Amazon EC2 Auto Scaling launches new instances before terminating the old ones, so that updating your group does not compromise the performance or availability of your application.

   

  Note the following about changing ``DesiredCapacity``, ``MaxSize``, or ``MinSize``:

   

  
  * If a scale-in activity occurs as a result of a new ``DesiredCapacity`` value that is lower than the current size of the group, the Auto Scaling group uses its termination policy to determine which instances to terminate.
   
  * If you specify a new value for ``MinSize`` without specifying a value for ``DesiredCapacity``, and the new ``MinSize`` is larger than the current size of the group, this sets the group's ``DesiredCapacity`` to the new ``MinSize`` value.
   
  * If you specify a new value for ``MaxSize`` without specifying a value for ``DesiredCapacity``, and the new ``MaxSize`` is smaller than the current size of the group, this sets the group's ``DesiredCapacity`` to the new ``MaxSize`` value.
  

   

  To see which properties have been set, call the `DescribeAutoScalingGroups <https://docs.aws.amazon.com/autoscaling/ec2/APIReference/API_DescribeAutoScalingGroups.html>`__ API. To view the scaling policies for an Auto Scaling group, call the `DescribePolicies <https://docs.aws.amazon.com/autoscaling/ec2/APIReference/API_DescribePolicies.html>`__ API. If the group has scaling policies, you can update them by calling the `PutScalingPolicy <https://docs.aws.amazon.com/autoscaling/ec2/APIReference/API_PutScalingPolicy.html>`__ API.

  

  See also: `AWS API Documentation <https://docs.aws.amazon.com/goto/WebAPI/autoscaling-2011-01-01/UpdateAutoScalingGroup>`_  


  **Request Syntax**
  ::

    response = client.update_auto_scaling_group(
        AutoScalingGroupName='string',
        LaunchConfigurationName='string',
        LaunchTemplate={
            'LaunchTemplateId': 'string',
            'LaunchTemplateName': 'string',
            'Version': 'string'
        },
        MixedInstancesPolicy={
            'LaunchTemplate': {
                'LaunchTemplateSpecification': {
                    'LaunchTemplateId': 'string',
                    'LaunchTemplateName': 'string',
                    'Version': 'string'
                },
                'Overrides': [
                    {
                        'InstanceType': 'string',
                        'WeightedCapacity': 'string',
                        'LaunchTemplateSpecification': {
                            'LaunchTemplateId': 'string',
                            'LaunchTemplateName': 'string',
                            'Version': 'string'
                        },
                        'InstanceRequirements': {
                            'VCpuCount': {
                                'Min': 123,
                                'Max': 123
                            },
                            'MemoryMiB': {
                                'Min': 123,
                                'Max': 123
                            },
                            'CpuManufacturers': [
                                'intel'|'amd'|'amazon-web-services'|'apple',
                            ],
                            'MemoryGiBPerVCpu': {
                                'Min': 123.0,
                                'Max': 123.0
                            },
                            'ExcludedInstanceTypes': [
                                'string',
                            ],
                            'InstanceGenerations': [
                                'current'|'previous',
                            ],
                            'SpotMaxPricePercentageOverLowestPrice': 123,
                            'MaxSpotPriceAsPercentageOfOptimalOnDemandPrice': 123,
                            'OnDemandMaxPricePercentageOverLowestPrice': 123,
                            'BareMetal': 'included'|'excluded'|'required',
                            'BurstablePerformance': 'included'|'excluded'|'required',
                            'RequireHibernateSupport': True|False,
                            'NetworkInterfaceCount': {
                                'Min': 123,
                                'Max': 123
                            },
                            'LocalStorage': 'included'|'excluded'|'required',
                            'LocalStorageTypes': [
                                'hdd'|'ssd',
                            ],
                            'TotalLocalStorageGB': {
                                'Min': 123.0,
                                'Max': 123.0
                            },
                            'BaselineEbsBandwidthMbps': {
                                'Min': 123,
                                'Max': 123
                            },
                            'AcceleratorTypes': [
                                'gpu'|'fpga'|'inference',
                            ],
                            'AcceleratorCount': {
                                'Min': 123,
                                'Max': 123
                            },
                            'AcceleratorManufacturers': [
                                'nvidia'|'amd'|'amazon-web-services'|'xilinx',
                            ],
                            'AcceleratorNames': [
                                'a100'|'v100'|'k80'|'t4'|'m60'|'radeon-pro-v520'|'vu9p',
                            ],
                            'AcceleratorTotalMemoryMiB': {
                                'Min': 123,
                                'Max': 123
                            },
                            'NetworkBandwidthGbps': {
                                'Min': 123.0,
                                'Max': 123.0
                            },
                            'AllowedInstanceTypes': [
                                'string',
                            ],
                            'BaselinePerformanceFactors': {
                                'Cpu': {
                                    'References': [
                                        {
                                            'InstanceFamily': 'string'
                                        },
                                    ]
                                }
                            }
                        },
                        'ImageId': 'string'
                    },
                ]
            },
            'InstancesDistribution': {
                'OnDemandAllocationStrategy': 'string',
                'OnDemandBaseCapacity': 123,
                'OnDemandPercentageAboveBaseCapacity': 123,
                'SpotAllocationStrategy': 'string',
                'SpotInstancePools': 123,
                'SpotMaxPrice': 'string'
            }
        },
        MinSize=123,
        MaxSize=123,
        DesiredCapacity=123,
        DefaultCooldown=123,
        AvailabilityZones=[
            'string',
        ],
        HealthCheckType='string',
        HealthCheckGracePeriod=123,
        PlacementGroup='string',
        VPCZoneIdentifier='string',
        TerminationPolicies=[
            'string',
        ],
        NewInstancesProtectedFromScaleIn=True|False,
        ServiceLinkedRoleARN='string',
        MaxInstanceLifetime=123,
        CapacityRebalance=True|False,
        Context='string',
        DesiredCapacityType='string',
        DefaultInstanceWarmup=123,
        InstanceMaintenancePolicy={
            'MinHealthyPercentage': 123,
            'MaxHealthyPercentage': 123
        },
        AvailabilityZoneDistribution={
            'CapacityDistributionStrategy': 'balanced-only'|'balanced-best-effort'
        },
        AvailabilityZoneImpairmentPolicy={
            'ZonalShiftEnabled': True|False,
            'ImpairedZoneHealthCheckBehavior': 'ReplaceUnhealthy'|'IgnoreUnhealthy'
        },
        SkipZonalShiftValidation=True|False,
        CapacityReservationSpecification={
            'CapacityReservationPreference': 'capacity-reservations-only'|'capacity-reservations-first'|'none'|'default',
            'CapacityReservationTarget': {
                'CapacityReservationIds': [
                    'string',
                ],
                'CapacityReservationResourceGroupArns': [
                    'string',
                ]
            }
        },
        InstanceLifecyclePolicy={
            'RetentionTriggers': {
                'TerminateHookAbandon': 'retain'|'terminate'
            }
        },
        DeletionProtection='none'|'prevent-force-deletion'|'prevent-all-deletion'
    )
    
  :type AutoScalingGroupName: string
  :param AutoScalingGroupName: **[REQUIRED]** 

    The name of the Auto Scaling group.

    

  
  :type LaunchConfigurationName: string
  :param LaunchConfigurationName: 

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

    

  
  :type LaunchTemplate: dict
  :param LaunchTemplate: 

    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``.

    

  
    - **LaunchTemplateId** *(string) --* 

      The ID of the launch template. To get the template ID, use the Amazon EC2 `DescribeLaunchTemplates <https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DescribeLaunchTemplates.html>`__ API operation. New launch templates can be created using the Amazon EC2 `CreateLaunchTemplate <https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_CreateLaunchTemplate.html>`__ 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 <https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DescribeLaunchTemplates.html>`__ API operation. New launch templates can be created using the Amazon EC2 `CreateLaunchTemplate <https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_CreateLaunchTemplate.html>`__ 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 <https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DescribeLaunchTemplateVersions.html>`__ API operation. New launch template versions can be created using the Amazon EC2 `CreateLaunchTemplateVersion <https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_CreateLaunchTemplateVersion.html>`__ 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``.

      

    
  
  :type MixedInstancesPolicy: dict
  :param MixedInstancesPolicy: 

    The mixed instances policy. For more information, see `Auto Scaling groups with multiple instance types and purchase options <https://docs.aws.amazon.com/autoscaling/ec2/userguide/ec2-auto-scaling-mixed-instances-groups.html>`__ in the *Amazon EC2 Auto Scaling User Guide*.

    

  
    - **LaunchTemplate** *(dict) --* 

      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** *(dict) --* 

        The launch template.

        

      
        - **LaunchTemplateId** *(string) --* 

          The ID of the launch template. To get the template ID, use the Amazon EC2 `DescribeLaunchTemplates <https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DescribeLaunchTemplates.html>`__ API operation. New launch templates can be created using the Amazon EC2 `CreateLaunchTemplate <https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_CreateLaunchTemplate.html>`__ 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 <https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DescribeLaunchTemplates.html>`__ API operation. New launch templates can be created using the Amazon EC2 `CreateLaunchTemplate <https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_CreateLaunchTemplate.html>`__ 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 <https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DescribeLaunchTemplateVersions.html>`__ API operation. New launch template versions can be created using the Amazon EC2 `CreateLaunchTemplateVersion <https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_CreateLaunchTemplateVersion.html>`__ 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.

        

      
        - *(dict) --* 

          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 <https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instance-types.html>`__ in the *Amazon EC2 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 `Configure an Auto Scaling group to use instance weights <https://docs.aws.amazon.com/autoscaling/ec2/userguide/ec2-auto-scaling-mixed-instances-groups-instance-weighting.html>`__ 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** *(dict) --* 

            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 <https://docs.aws.amazon.com/autoscaling/ec2/userguide/ec2-auto-scaling-mixed-instances-groups-launch-template-overrides.html>`__ 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 <https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DescribeLaunchTemplates.html>`__ API operation. New launch templates can be created using the Amazon EC2 `CreateLaunchTemplate <https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_CreateLaunchTemplate.html>`__ 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 <https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DescribeLaunchTemplates.html>`__ API operation. New launch templates can be created using the Amazon EC2 `CreateLaunchTemplate <https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_CreateLaunchTemplate.html>`__ 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 <https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DescribeLaunchTemplateVersions.html>`__ API operation. New launch template versions can be created using the Amazon EC2 `CreateLaunchTemplateVersion <https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_CreateLaunchTemplateVersion.html>`__ 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** *(dict) --* 

            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** *(dict) --* **[REQUIRED]** 

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

              

            
              - **Min** *(integer) --* **[REQUIRED]** 

                The minimum number of vCPUs.

                

              
              - **Max** *(integer) --* 

                The maximum number of vCPUs.

                

              
            
            - **MemoryMiB** *(dict) --* **[REQUIRED]** 

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

              

            
              - **Min** *(integer) --* **[REQUIRED]** 

                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``.
               
              * For instance types with Apple CPUs, specify ``apple``.
              

               

              .. 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** *(dict) --* 

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

               

              Default: No minimum or maximum limits

              

            
              - **Min** *(float) --* 

                The memory minimum in GiB.

                

              
              - **Max** *(float) --* 

                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 <https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instance-types.html>`__ in the *Amazon EC2 User Guide*.
               
              * For previous generation instance types, specify ``previous``.
              

               

              Default: Any current or previous generation

              

            
              - *(string) --* 

              
          
            - **SpotMaxPricePercentageOverLowestPrice** *(integer) --* 

              [Price protection] The price protection threshold for Spot Instances, as a percentage higher than an identified Spot price. The identified Spot price is the price of the lowest priced current generation C, M, or R instance type with your specified attributes. If no current generation C, M, or R instance type matches your attributes, then the identified price is from either the lowest priced current generation instance types or, failing that, the lowest priced previous generation instance types that match your attributes. When Amazon EC2 Auto Scaling selects instance types with your attributes, we will exclude instance types whose price exceeds your specified threshold.

               

              The parameter accepts an integer, which Amazon EC2 Auto Scaling interprets as a percentage.

               

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

               

              .. note::

                

                Only one of ``SpotMaxPricePercentageOverLowestPrice`` or ``MaxSpotPriceAsPercentageOfOptimalOnDemandPrice`` can be specified. If you don't specify either, Amazon EC2 Auto Scaling will automatically apply optimal price protection to consistently select from a wide range of instance types. To indicate no price protection threshold for Spot Instances, meaning you want to consider all instance types that match your attributes, include one of these parameters and specify a high value, such as ``999999``.

                

              

            
            - **MaxSpotPriceAsPercentageOfOptimalOnDemandPrice** *(integer) --* 

              [Price protection] The price protection threshold for Spot Instances, as a percentage of an identified On-Demand price. The identified On-Demand price is the price of the lowest priced current generation C, M, or R instance type with your specified attributes. If no current generation C, M, or R instance type matches your attributes, then the identified price is from either the lowest priced current generation instance types or, failing that, the lowest priced previous generation instance types that match your attributes. When Amazon EC2 Auto Scaling selects instance types with your attributes, we will exclude instance types whose price exceeds your specified threshold.

               

              The parameter accepts an integer, which Amazon EC2 Auto Scaling interprets as a percentage.

               

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

               

              .. note::

                

                Only one of ``SpotMaxPricePercentageOverLowestPrice`` or ``MaxSpotPriceAsPercentageOfOptimalOnDemandPrice`` can be specified. If you don't specify either, Amazon EC2 Auto Scaling will automatically apply optimal price protection to consistently select from a wide range of instance types. To indicate no price protection threshold for Spot Instances, meaning you want to consider all instance types that match your attributes, include one of these parameters and specify a high value, such as ``999999``.

                

              

            
            - **OnDemandMaxPricePercentageOverLowestPrice** *(integer) --* 

              [Price protection] The price protection threshold for On-Demand Instances, as a percentage higher than an identified On-Demand price. The identified On-Demand price is the price of the lowest priced current generation C, M, or R instance type with your specified attributes. If no current generation C, M, or R instance type matches your attributes, then the identified price is from either the lowest priced current generation instance types or, failing that, the lowest priced previous generation instance types that match your attributes. When Amazon EC2 Auto Scaling selects instance types with your attributes, we will exclude instance types whose price exceeds your specified 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 <https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/burstable-performance-instances.html>`__ in the *Amazon EC2 User Guide*.

               

              Default: ``excluded``

              

            
            - **RequireHibernateSupport** *(boolean) --* 

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

               

              Default: ``false``

              

            
            - **NetworkInterfaceCount** *(dict) --* 

              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 <https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/InstanceStorage.html>`__ in the *Amazon EC2 User Guide*.

               

              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** *(dict) --* 

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

               

              Default: No minimum or maximum limits

              

            
              - **Min** *(float) --* 

                The storage minimum in GB.

                

              
              - **Max** *(float) --* 

                The storage maximum in GB.

                

              
            
            - **BaselineEbsBandwidthMbps** *(dict) --* 

              The minimum and maximum baseline bandwidth performance for an instance type, in Mbps. For more information, see `Amazon EBS–optimized instances <https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-optimized.html>`__ in the *Amazon EC2 User Guide*.

               

              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** *(dict) --* 

              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** *(dict) --* 

              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** *(dict) --* 

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

               

              Default: No minimum or maximum limits

              

            
              - **Min** *(float) --* 

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

                

              
              - **Max** *(float) --* 

                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) --* 

              
          
            - **BaselinePerformanceFactors** *(dict) --* 

              The baseline performance factors for the instance requirements.

              

            
              - **Cpu** *(dict) --* 

                The CPU performance to consider, using an instance family as the baseline reference.

                

              
                - **References** *(list) --* 

                  Specify an instance family to use as the baseline reference for CPU performance. All instance types that match your specified attributes will be compared against the CPU performance of the referenced instance family, regardless of CPU manufacturer or architecture differences.

                   

                  .. note::

                    

                    Currently only one instance family can be specified in the list.

                    

                  

                
                  - *(dict) --* 

                    Specify an instance family to use as the baseline reference for CPU performance. All instance types that All instance types that match your specified attributes will be compared against the CPU performance of the referenced instance family, regardless of CPU manufacturer or architecture differences.

                     

                    .. note::

                      

                      Currently only one instance family can be specified in the list.

                      

                    

                  
                    - **InstanceFamily** *(string) --* 

                      The instance family to use as a baseline reference.

                       

                      .. note::

                        

                        Make sure that you specify the correct value for the instance family. The instance family is everything before the period (.) in the instance type name. For example, in the instance ``c6i.large``, the instance family is ``c6i``, not ``c6``. For more information, see `Amazon EC2 instance type naming conventions <https://docs.aws.amazon.com/ec2/latest/instancetypes/instance-type-names.html>`__ in *Amazon EC2 Instance Types*.

                        

                       

                      The following instance types are *not supported* for performance protection.

                       

                      
                      * ``c1``
                       
                      * ``g3| g3s``
                       
                      * ``hpc7g``
                       
                      * ``m1| m2``
                       
                      * ``mac1 | mac2 | mac2-m1ultra | mac2-m2 | mac2-m2pro``
                       
                      * ``p3dn | p4d | p5``
                       
                      * ``t1``
                       
                      * ``u-12tb1 | u-18tb1 | u-24tb1 | u-3tb1 | u-6tb1 | u-9tb1 | u7i-12tb | u7in-16tb | u7in-24tb | u7in-32tb``
                      

                       

                      If you performance protection by specifying a supported instance family, the returned instance types will exclude the preceding unsupported instance families.

                       

                      If you specify an unsupported instance family as a value for baseline performance, the API returns an empty response.

                      

                    
                  
              
              
            
          
          - **ImageId** *(string) --* 

            The ID of the Amazon Machine Image (AMI) to use for instances launched with this override. When using Instance Refresh with ``ReplaceRootVolume`` strategy, this specifies the AMI for root volume replacement operations.

             

            For ``ReplaceRootVolume`` operations:

             

            
            * All overrides in the ``MixedInstancesPolicy`` must specify an ImageId
             
            * The AMI must contain only a single root volume
             
            * Root volume replacement doesn't support multi-volume AMIs
            

            

          
        
    
    
    - **InstancesDistribution** *(dict) --* 

      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 <https://docs.aws.amazon.com/autoscaling/ec2/APIReference/API_InstanceRequirements.html>`__.

          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 <https://docs.aws.amazon.com/autoscaling/ec2/APIReference/API_InstanceRequirements.html>`__ 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 <https://docs.aws.amazon.com/autoscaling/ec2/APIReference/API_InstanceRequirements.html>`__.

          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)  

        The price and capacity optimized allocation strategy looks at both price and capacity to select the Spot Instance pools that are the least likely to be interrupted and have the lowest possible price.

        

      
      - **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

        

      
    
  
  :type MinSize: integer
  :param MinSize: 

    The minimum size of the Auto Scaling group.

    

  
  :type MaxSize: integer
  :param MaxSize: 

    The maximum size of the Auto Scaling group.

     

    .. note::

      

      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).

      

    

  
  :type DesiredCapacity: integer
  :param DesiredCapacity: 

    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.

    

  
  :type DefaultCooldown: integer
  :param DefaultCooldown: 

    *Only needed if you use simple scaling policies.*

     

    The amount of time, in seconds, between one scaling activity ending and another one starting due to simple scaling policies. For more information, see `Scaling cooldowns for Amazon EC2 Auto Scaling <https://docs.aws.amazon.com/autoscaling/ec2/userguide/ec2-auto-scaling-scaling-cooldowns.html>`__ in the *Amazon EC2 Auto Scaling User Guide*.

    

  
  :type AvailabilityZones: list
  :param AvailabilityZones: 

    One or more Availability Zones for the group.

    

  
    - *(string) --* 

    

  :type HealthCheckType: string
  :param HealthCheckType: 

    A comma-separated value string of one or more health check types.

     

    The valid values are ``EC2``, ``EBS``, ``ELB``, and ``VPC_LATTICE``. ``EC2`` is the default health check and cannot be disabled. For more information, see `Health checks for instances in an Auto Scaling group <https://docs.aws.amazon.com/autoscaling/ec2/userguide/ec2-auto-scaling-health-checks.html>`__ in the *Amazon EC2 Auto Scaling User Guide*.

     

    Only specify ``EC2`` if you must clear a value that was previously set.

    

  
  :type HealthCheckGracePeriod: integer
  :param HealthCheckGracePeriod: 

    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 and marking it unhealthy due to a failed health check. This is useful if your instances do not immediately pass their health checks after they enter the ``InService`` state. For more information, see `Set the health check grace period for an Auto Scaling group <https://docs.aws.amazon.com/autoscaling/ec2/userguide/health-check-grace-period.html>`__ in the *Amazon EC2 Auto Scaling User Guide*.

    

  
  :type PlacementGroup: string
  :param PlacementGroup: 

    The name of an existing placement group into which to launch your instances. To remove the placement group setting, pass an empty string for ``placement-group``. For more information about placement groups, see `Placement groups <https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html>`__ in the *Amazon EC2 User Guide*.

     

    .. note::

      

      A *cluster* placement group is a logical grouping of instances within a single Availability Zone. You cannot specify multiple Availability Zones and a cluster placement group.

      

    

  
  :type VPCZoneIdentifier: string
  :param VPCZoneIdentifier: 

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

    

  
  :type TerminationPolicies: list
  :param TerminationPolicies: 

    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 `Configure termination policies for Amazon EC2 Auto Scaling <https://docs.aws.amazon.com/autoscaling/ec2/userguide/ec2-auto-scaling-termination-policies.html>`__ in the *Amazon EC2 Auto Scaling User Guide*.

     

    Valid values: ``Default`` | ``AllocationStrategy`` | ``ClosestToNextInstanceHour`` | ``NewestInstance`` | ``OldestInstance`` | ``OldestLaunchConfiguration`` | ``OldestLaunchTemplate`` | ``arn:aws:lambda:region:account-id:function:my-function:my-alias``

    

  
    - *(string) --* 

    

  :type NewInstancesProtectedFromScaleIn: boolean
  :param NewInstancesProtectedFromScaleIn: 

    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 `Use instance scale-in protection <https://docs.aws.amazon.com/autoscaling/ec2/userguide/ec2-auto-scaling-instance-protection.html>`__ in the *Amazon EC2 Auto Scaling User Guide*.

    

  
  :type ServiceLinkedRoleARN: string
  :param ServiceLinkedRoleARN: 

    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 <https://docs.aws.amazon.com/autoscaling/ec2/userguide/autoscaling-service-linked-role.html>`__ in the *Amazon EC2 Auto Scaling User Guide*.

    

  
  :type MaxInstanceLifetime: integer
  :param MaxInstanceLifetime: 

    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 <https://docs.aws.amazon.com/autoscaling/ec2/userguide/asg-max-instance-lifetime.html>`__ in the *Amazon EC2 Auto Scaling User Guide*.

    

  
  :type CapacityRebalance: boolean
  :param CapacityRebalance: 

    Enables or disables Capacity Rebalancing. If Capacity Rebalancing is disabled, proactive replacement of at-risk Spot Instances does not occur. For more information, see `Capacity Rebalancing in Auto Scaling to replace at-risk Spot Instances <https://docs.aws.amazon.com/autoscaling/ec2/userguide/ec2-auto-scaling-capacity-rebalancing.html>`__ in the *Amazon EC2 Auto Scaling User Guide*.

     

    .. note::

      

      To suspend rebalancing across Availability Zones, use the `SuspendProcesses <https://docs.aws.amazon.com/autoscaling/ec2/APIReference/API_SuspendedProcess.html>`__ API.

      

    

  
  :type Context: string
  :param Context: 

    Reserved.

    

  
  :type DesiredCapacityType: string
  :param DesiredCapacityType: 

    The unit of measurement for the value specified for desired capacity. Amazon EC2 Auto Scaling supports ``DesiredCapacityType`` for attribute-based instance type selection only. For more information, see `Create a mixed instances group using attribute-based instance type selection <https://docs.aws.amazon.com/autoscaling/ec2/userguide/create-mixed-instances-group-attribute-based-instance-type-selection.html>`__ in the *Amazon EC2 Auto Scaling User Guide*.

     

    By default, Amazon EC2 Auto Scaling specifies ``units``, which translates into number of instances.

     

    Valid values: ``units`` | ``vcpu`` | ``memory-mib``

    

  
  :type DefaultInstanceWarmup: integer
  :param DefaultInstanceWarmup: 

    The amount of time, in seconds, until a new instance is considered to have finished initializing and resource consumption to become stable after it enters the ``InService`` state.

     

    During an instance refresh, Amazon EC2 Auto Scaling waits for the warm-up period after it replaces an instance before it moves on to replacing the next instance. Amazon EC2 Auto Scaling also waits for the warm-up period before aggregating the metrics for new instances with existing instances in the Amazon CloudWatch metrics that are used for scaling, resulting in more reliable usage data. For more information, see `Set the default instance warmup for an Auto Scaling group <https://docs.aws.amazon.com/autoscaling/ec2/userguide/ec2-auto-scaling-default-instance-warmup.html>`__ in the *Amazon EC2 Auto Scaling User Guide*.

     

    .. warning::

       

      To manage various warm-up settings at the group level, we recommend that you set the default instance warmup, *even if it is set to 0 seconds*. To remove a value that you previously set, include the property but specify ``-1`` for the value. However, we strongly recommend keeping the default instance warmup enabled by specifying a value of ``0`` or other nominal value.

      

    

  
  :type InstanceMaintenancePolicy: dict
  :param InstanceMaintenancePolicy: 

    An instance maintenance policy. For more information, see `Set instance maintenance policy <https://docs.aws.amazon.com/autoscaling/ec2/userguide/ec2-auto-scaling-instance-maintenance-policy.html>`__ in the *Amazon EC2 Auto Scaling User Guide*.

    

  
    - **MinHealthyPercentage** *(integer) --* 

      Specifies the lower threshold as a percentage of the desired capacity of the Auto Scaling group. It represents the minimum percentage of the group to keep in service, healthy, and ready to use to support your workload when replacing instances. Value range is 0 to 100. To clear a previously set value, specify a value of ``-1``.

      

    
    - **MaxHealthyPercentage** *(integer) --* 

      Specifies the upper threshold as a percentage of the desired capacity of the Auto Scaling group. It represents the maximum percentage of the group that can be in service and healthy, or pending, to support your workload when replacing instances. Value range is 100 to 200. To clear a previously set value, specify a value of ``-1``.

       

      Both ``MinHealthyPercentage`` and ``MaxHealthyPercentage`` must be specified, and the difference between them cannot be greater than 100. A large range increases the number of instances that can be replaced at the same time.

      

    
  
  :type AvailabilityZoneDistribution: dict
  :param AvailabilityZoneDistribution: 

    The instance capacity distribution across Availability Zones.

    

  
    - **CapacityDistributionStrategy** *(string) --* 

      If launches fail in an Availability Zone, the following strategies are available. The default is ``balanced-best-effort``.

       

      
      * ``balanced-only`` - If launches fail in an Availability Zone, Auto Scaling will continue to attempt to launch in the unhealthy zone to preserve a balanced distribution.
       
      * ``balanced-best-effort`` - If launches fail in an Availability Zone, Auto Scaling will attempt to launch in another healthy Availability Zone instead.
      

      

    
  
  :type AvailabilityZoneImpairmentPolicy: dict
  :param AvailabilityZoneImpairmentPolicy: 

    The policy for Availability Zone impairment.

    

  
    - **ZonalShiftEnabled** *(boolean) --* 

      If ``true``, enable zonal shift for your Auto Scaling group.

      

    
    - **ImpairedZoneHealthCheckBehavior** *(string) --* 

      Specifies the health check behavior for the impaired Availability Zone in an active zonal shift. If you select ``Replace unhealthy``, instances that appear unhealthy will be replaced in all Availability Zones. If you select ``Ignore unhealthy``, instances will not be replaced in the Availability Zone with the active zonal shift. For more information, see `Auto Scaling group zonal shift <https://docs.aws.amazon.com/autoscaling/ec2/userguide/ec2-auto-scaling-zonal-shift.html>`__ in the *Amazon EC2 Auto Scaling User Guide*.

      

    
  
  :type SkipZonalShiftValidation: boolean
  :param SkipZonalShiftValidation: 

    If you enable zonal shift with cross-zone disabled load balancers, capacity could become imbalanced across Availability Zones. To skip the validation, specify ``true``. For more information, see `Auto Scaling group zonal shift <https://docs.aws.amazon.com/autoscaling/ec2/userguide/ec2-auto-scaling-zonal-shift.html>`__ in the *Amazon EC2 Auto Scaling User Guide*.

    

  
  :type CapacityReservationSpecification: dict
  :param CapacityReservationSpecification: 

    The capacity reservation specification for the Auto Scaling group.

    

  
    - **CapacityReservationPreference** *(string) --* 

      The capacity reservation preference. The following options are available:

       

      
      * ``capacity-reservations-only`` - Auto Scaling will only launch instances into a Capacity Reservation or Capacity Reservation resource group. If capacity isn't available, instances will fail to launch.
       
      * ``capacity-reservations-first`` - Auto Scaling will try to launch instances into a Capacity Reservation or Capacity Reservation resource group first. If capacity isn't available, instances will run in On-Demand capacity.
       
      * ``none`` - Auto Scaling will not launch instances into a Capacity Reservation. Instances will run in On-Demand capacity.
       
      * ``default`` - Auto Scaling uses the Capacity Reservation preference from your launch template or an open Capacity Reservation.
      

      

    
    - **CapacityReservationTarget** *(dict) --* 

      Describes a target Capacity Reservation or Capacity Reservation resource group.

      

    
      - **CapacityReservationIds** *(list) --* 

        The Capacity Reservation IDs to launch instances into.

        

      
        - *(string) --* 

        
    
      - **CapacityReservationResourceGroupArns** *(list) --* 

        The resource group ARNs of the Capacity Reservation to launch instances into.

        

      
        - *(string) --* 

        
    
    
  
  :type InstanceLifecyclePolicy: dict
  :param InstanceLifecyclePolicy: 

    The instance lifecycle policy for the Auto Scaling group. This policy controls instance behavior when an instance transitions through its lifecycle states. Configure retention triggers to specify when instances should move to a ``Retained`` state instead of automatic termination.

     

    For more information, see `Control instance retention with instance lifecycle policies <https://docs.aws.amazon.com/autoscaling/ec2/userguide/instance-lifecycle-policy.html>`__ in the *Amazon EC2 Auto Scaling User Guide*.

    

  
    - **RetentionTriggers** *(dict) --* 

      Specifies the conditions that trigger instance retention behavior. These triggers determine when instances should move to a ``Retained`` state instead of automatic termination. This allows you to maintain control over instance management when lifecycles transition and operations fail.

      

    
      - **TerminateHookAbandon** *(string) --* 

        Specifies the action when a termination lifecycle hook is abandoned due to failure, timeout, or explicit abandonment (calling CompleteLifecycleAction).

         

        Set to ``retain`` to move instances to a retained state. Set to ``terminate`` for default termination behavior.

         

        Retained instances don't count toward desired capacity and remain until you call ``TerminateInstanceInAutoScalingGroup``.

        

      
    
  
  :type DeletionProtection: string
  :param DeletionProtection: 

    The deletion protection setting for the Auto Scaling group. This setting helps safeguard your Auto Scaling group and its instances by controlling whether the ``DeleteAutoScalingGroup`` operation is allowed. When deletion protection is enabled, users cannot delete the Auto Scaling group according to the specified protection level until the setting is changed back to a less restrictive level.

     

    The valid values are ``none``, ``prevent-force-deletion``, and ``prevent-all-deletion``.

     

    Default: ``none``

    

  
  
  :returns: None
  **Exceptions**
  
  *   :py:class:`AutoScaling.Client.exceptions.ScalingActivityInProgressFault`

  
  *   :py:class:`AutoScaling.Client.exceptions.ResourceContentionFault`

  
  *   :py:class:`AutoScaling.Client.exceptions.ServiceLinkedRoleFailure`

  

  **Examples**

  This example updates multiple properties at the same time.
  ::

    response = client.update_auto_scaling_group(
        AutoScalingGroupName='my-auto-scaling-group',
        LaunchTemplate={
            'LaunchTemplateName': 'my-template-for-auto-scaling',
            'Version': '2',
        },
        MaxSize=5,
        MinSize=1,
        NewInstancesProtectedFromScaleIn=True,
    )
    
    print(response)

  
  Expected Output:
  ::

    {
        'ResponseMetadata': {
            '...': '...',
        },
    }

  