# Prerequisites
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To successfully complete this tutorial, you must first:
+  Complete the prerequisites in [Prerequisites](tutorial-ecs-prereqs.md) for [Tutorial: Deploy an application into Amazon ECS](tutorial-ecs-deployment.md). 
+  Complete the steps in [Tutorial: Deploy an application into Amazon ECS](tutorial-ecs-deployment.md). Make a note of the following: 
  +  The name of your load balancer. 
  +  The names of your target groups. 
  +  The port used by your load balancer's listener. 
  +  The ARN of your load balancer. You use this to create a new listener. 
  +  The ARN of one of your target groups. You use this to create a new listener. 
  +  The CodeDeploy application and deployment group you create. 
  +  The AppSpec file you create that is used by your CodeDeploy deployment. You edit this file in this tutorial.