Amazon EC2 Spot Fleet and Application Auto Scaling - Application Auto Scaling
Service-linked roleService principalRegistering Spot Fleets as scalable targets with Application Auto ScalingRelated resources
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Amazon EC2 Spot Fleet and Application Auto Scaling

You can scale Spot Fleets using target tracking scaling policies, step scaling policies, and scheduled scaling.

Use the following information to help you integrate Spot Fleet with Application Auto Scaling.

Service-linked role created for Spot Fleet

The following service-linked role is automatically created in your Amazon Web Services account when registering Spot Fleet resources as scalable targets with Application Auto Scaling. This role allows Application Auto Scaling to perform supported operations within your account. For more information, see Service-linked roles for Application Auto Scaling.

  • AWSServiceRoleForApplicationAutoScaling_EC2SpotFleetRequest

Service principal used by the service-linked role

The service-linked role in the previous section can be assumed only by the service principal authorized by the trust relationships defined for the role. The service-linked role used by Application Auto Scaling grants access to the following service principal:

  • ec2.application-autoscaling.amazonaws.com

Registering Spot Fleets as scalable targets with Application Auto Scaling

Application Auto Scaling requires a scalable target before you can create scaling policies or scheduled actions for a Spot Fleet. A scalable target is a resource that Application Auto Scaling can scale out and scale in. Scalable targets are uniquely identified by the combination of resource ID, scalable dimension, and namespace.

If you configure auto scaling using the Spot Fleet console, then Spot Fleet automatically registers a scalable target for you.

If you want to configure auto scaling using the Amazon CLI or one of the Amazon SDKs, you can use the following options:

  • Amazon CLI:

    Call the register-scalable-target command for a Spot Fleet. The following example registers the target capacity of a Spot Fleet using its request ID, with a minimum capacity of two instances and a maximum capacity of 10 instances.

    aws application-autoscaling register-scalable-target \
  --service-namespace ec2 \
  --scalable-dimension ec2:spot-fleet-request:TargetCapacity \
  --resource-id spot-fleet-request/sfr-73fbd2ce-aa30-494c-8788-1cee4EXAMPLE \
  --min-capacity 2 \
  --max-capacity 10

    If successful, this command returns the ARN of the scalable target.

    {
    "ScalableTargetARN": "arn:aws-cn:application-autoscaling:region:account-id:scalable-target/1234abcd56ab78cd901ef1234567890ab123"
}

  • Amazon SDK:

    Call the RegisterScalableTarget operation and provide ResourceId, ScalableDimension, ServiceNamespace, MinCapacity, and MaxCapacity as parameters.

If you are just getting started with Application Auto Scaling, you can find additional useful information about scaling your Spot Fleet in the following documentation:

Automatic scaling for Spot Fleet in the Amazon EC2 User Guide