Running Datadog agent on startup with ECS

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#!/bin/bash
cluster="CLUSTER_NAME"

echo ECS_CLUSTER=$cluster >> /etc/ecs/ecs.config
yum install -y aws-cli jq
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#upstart-job
description "Datadog Agent"
author "Datadog"
start on started ecs

script
    exec 2>>/var/log/ecs/ecs-start-task.log
    set -x
    
    until curl -s http://localhost:51678/v1/metadata
    do
        sleep 1
    done

    instance_arn=$(curl -s http://localhost:51678/v1/metadata | jq -r '. | .ContainerInstanceArn' | awk -F/ '{print $NF}' )
    cluster=$(curl -s http://localhost:51678/v1/metadata | jq -r '. | .Cluster' | awk -F/ '{print $NF}' )
    region=$(curl -s http://localhost:51678/v1/metadata | jq -r '. | .ContainerInstanceArn' | awk -F: '{print $4}')
    task_definition="TASK_DEFINITION"

    aws ecs start-task --cluster $cluster --task-definition $task_definition --container-instances $instance_arn --region $region
end script
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