Create a target tracking scaling policy for Amazon ECS service auto scaling - Amazon Elastic Container Service

Create a target tracking scaling policy for Amazon ECS service auto scaling

Create a target tracking scaling policy to have Amazon ECS increase or decrease the desired task count in your service automatically. Target tracking works off of a target metric value.

  1. In addition to the standard IAM permissions for creating and updating services, you need additional permissions. For more information, see IAM permissions required for Amazon ECS service auto scaling.

  2. Determine the metrics to use for the policy. The following metrics are available:

    • ECSServiceAverageCPUUtilization – The average CPU utilization the service should use.

    • ECSServiceAverageMemoryUtilization – Average memory utilization the service should use.

    • ALBRequestCountPerTarget – The average number of requests per minute that task should ideally receive.

  3. Open the console at https://console.aws.amazon.com/ecs/v2.

  4. On the Clusters page, choose the cluster.

  5. On the cluster details page, in the Services section, and then choose the service.

    The service details page appears.

  6. Choose Set the number of tasks.

  7. Under Amazon ECS service task count, choose Use auto scaling.

    The Task count section appears.

    1. For Minimum number of tasks, enter the lower limit of the number of tasks for service auto scaling to use. The desired count will not go below this count.

    2. For Maximum, enter the upper limit of the number of tasks for service auto scaling to use. The desired count will not go above this count.

    3. Choose Save.

      The policies page appears.

  8. Choose Create scaling policy.

    The Create policy page appears.

  9. For Scaling policy type, choose Target tracking.

  10. For Policy name, enter the name of the policy.

  11. For Metric type, choose your metrics from the list of options.

  12. For Target utilization, enter the target value for the percentage of tasks that Amazon ECS should maintain. Service auto scaling scales out your capacity until the average utilization is at the target utilization, or until it reaches the maximum number of tasks you specified.

  13. Under Additional Seetings, do the following

    1. For Scale-in cooldown period, enter the amount of time in seconds after a scale-in activity completes before another scale-in activity can start.

    2. For Scale-out cooldown period, enter the amount of time in seconds to wait for a previous scale-out activity to take effect.

    3. To create only a scale-out policy, select Disable scale-in.

  14. Choose Create scaling policy.

  1. Register your Amazon ECS service as a scalable target using the register-scalable-target command.

  2. Create a scaling policy using the put-scaling-policy command.