Solution

Access AWS CloudShall, and then execute commands like belows:

Check out your settings

Change the value of –resource-id like as “service/***”

[cloudshell-user@ip-xxx ~]$ aws application-autoscaling describe-scalable-targets --service-namespace ecs --resource-id service/cluter-name/service-name
{
    "ScalableTargets": [
        {
            "ServiceNamespace": "ecs",
            "ResourceId": "service/cluter-name/service-name",
            "ScalableDimension": "ecs:service:DesiredCount",
            "MinCapacity": 1,
            "MaxCapacity": 1,
            "RoleARN": "arn:aws:iam::0000:role/aws-service-role/ecs.application-autoscaling.amazonaws.com/AWSServiceRoleForApplicationAutoScaling_ECSService",
            "CreationTime": "2020-01-01T00:00:00.000000+00:00",
            "SuspendedState": {
                "DynamicScalingInSuspended": false,
                "DynamicScalingOutSuspended": false,
                "ScheduledScalingSuspended": false
            }
        }
    ]
}

Register autoscaling settings

Change the value of –resource-id like as “service/***”

[cloudshell-user@ip-xxx ~]$ aws application-autoscaling register-scalable-target --service-namespace ecs --resource-id service/cluter-name/service-name --scalable-dimension ecs:service:DesiredCount --min-capacity 2 --max-capacity 2 --role-arn arn:aws:iam::0000:role/aws-service-role/ecs.application-autoscaling.amazonaws.com/AWSServiceRoleForApplicationAutoScaling_ECSService

References