Services or capabilities described in Amazon Web Services documentation might vary by Region. To see the differences applicable to the China Regions, see Getting Started with Amazon Web Services in China (PDF).

Create a target tracking scaling policy for Application Auto Scaling using the Amazon CLI

This example uses Amazon CLI commands to create a target racking policy for an Amazon EC2 Spot Fleet. For a different scalable target, specify its namespace in --service-namespace, its scalable dimension in --scalable-dimension, and its resource ID in --resource-id.

When using the Amazon CLI, remember that your commands run in the Amazon Web Services Region configured for your profile. If you want to run the commands in a different Region, either change the default Region for your profile, or use the --region parameter with the command.

Step 1: Register a scalable target

If you haven't already done so, register the scalable target. Use the register-scalable-target command to register a specific resource in the target service as a scalable target. The following example registers a Spot Fleet request with Application Auto Scaling. Application Auto Scaling can scale the number of instances in the Spot Fleet at a minimum of 2 instances and a maximum of 10. Replace each user input placeholder with your own information.

Linux, macOS, or Unix

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

Windows

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

Output

If successful, this command returns the ARN of the scalable target. The following is example output.

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

Step 2: Create a target tracking scaling policy

To create a target tracking scaling policy, you can use the following examples to help you get started.

Step 3: Describe target tracking scaling policies

You can describe all scaling policies for the specified service namespace using the following describe-scaling-policies command.

aws application-autoscaling describe-scaling-policies --service-namespace ec2

You can filter the results to just the target tracking scaling policies using the --query parameter. For more information about the syntax for query, see Controlling command output from the Amazon CLI in the Amazon Command Line Interface User Guide.

Linux, macOS, or Unix

aws application-autoscaling describe-scaling-policies --service-namespace ec2 \
  --query 'ScalingPolicies[?PolicyType==`TargetTrackingScaling`]'

Windows

aws application-autoscaling describe-scaling-policies --service-namespace ec2 ^
  --query "ScalingPolicies[?PolicyType==`TargetTrackingScaling`]"

Output

The following is example output.

[
    {
        "PolicyARN": "PolicyARN",
        "TargetTrackingScalingPolicyConfiguration": {
            "PredefinedMetricSpecification": {
                "PredefinedMetricType": "EC2SpotFleetRequestAverageCPUUtilization"
            },
            "TargetValue": 50.0
        },
        "PolicyName": "cpu50-target-tracking-scaling-policy",
        "ScalableDimension": "ec2:spot-fleet-request:TargetCapacity",
        "ServiceNamespace": "ec2",
        "PolicyType": "TargetTrackingScaling",
        "ResourceId": "spot-fleet-request/sfr-73fbd2ce-aa30-494c-8788-1cee4EXAMPLE",
        "Alarms": [
            {
                "AlarmARN": "arn:aws-cn:cloudwatch:region:account-id:alarm:TargetTracking-spot-fleet-request/sfr-73fbd2ce-aa30-494c-8788-1cee4EXAMPLE-AlarmHigh-d4f0770c-b46e-434a-a60f-3b36d653feca",
                "AlarmName": "TargetTracking-spot-fleet-request/sfr-73fbd2ce-aa30-494c-8788-1cee4EXAMPLE-AlarmHigh-d4f0770c-b46e-434a-a60f-3b36d653feca"
            },
            {
                "AlarmARN": "arn:aws-cn:cloudwatch:region:account-id:alarm:TargetTracking-spot-fleet-request/sfr-73fbd2ce-aa30-494c-8788-1cee4EXAMPLE-AlarmLow-1b437334-d19b-4a63-a812-6c67aaf2910d",
                "AlarmName": "TargetTracking-spot-fleet-request/sfr-73fbd2ce-aa30-494c-8788-1cee4EXAMPLE-AlarmLow-1b437334-d19b-4a63-a812-6c67aaf2910d"
            }
        ],
        "CreationTime": 1515021724.807
    }
]