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Class: Aws::AutoScaling::Types::MixedInstancesPolicy

  • Object
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Defined in:



When passing MixedInstancesPolicy as input to an Aws::Client method, you can use a vanilla Hash:

  launch_template: {
    launch_template_specification: {
      launch_template_id: "XmlStringMaxLen255",
      launch_template_name: "LaunchTemplateName",
      version: "XmlStringMaxLen255",
    overrides: [
        instance_type: "XmlStringMaxLen255",
        weighted_capacity: "XmlStringMaxLen32",
  instances_distribution: {
    on_demand_allocation_strategy: "XmlString",
    on_demand_base_capacity: 1,
    on_demand_percentage_above_base_capacity: 1,
    spot_allocation_strategy: "XmlString",
    spot_instance_pools: 1,
    spot_max_price: "MixedInstanceSpotPrice",

Describes a mixed instances policy for an Auto Scaling group. With mixed instances, your Auto Scaling group can provision a combination of On-Demand Instances and Spot Instances across multiple instance types. For more information, see Auto Scaling Groups with Multiple Instance Types and Purchase Options in the Amazon EC2 Auto Scaling User Guide.

You can create a mixed instances policy for a new Auto Scaling group, or you can create it for an existing group by updating the group to specify MixedInstancesPolicy as the top-level parameter instead of a launch configuration or template. For more information, see CreateAutoScalingGroup and UpdateAutoScalingGroup.

Returned by:

Instance Attribute Summary collapse

Instance Attribute Details


The instances distribution to use.

If you leave this parameter unspecified, the value for each parameter in InstancesDistribution uses a default value.



The launch template and instance types (overrides).

This parameter must be specified when creating a mixed instances policy.