AWS CloudFormation
User Guide (Version )

AWS::ECS::Service LoadBalancer

The LoadBalancer property specifies details on a load balancer that is used with a service.

If the service is using the ECS deployment controller, you are limited to one load balancer or target group.

If the service is using the CODE_DEPLOY deployment controller, the service is required to use either an Application Load Balancer or Network Load Balancer. When you are creating an AWS CodeDeploy deployment group, you specify two target groups (referred to as a targetGroupPair). Each target group binds to a separate task set in the deployment. The load balancer can also have up to two listeners, a required listener for production traffic and an optional listener that allows you to test new revisions of the service before routing production traffic to it.

Services with tasks that use the awsvpc network mode (for example, those with the Fargate launch type) only support Application Load Balancers and Network Load Balancers. Classic Load Balancers are not supported. Also, when you create any target groups for these services, you must choose ip as the target type, not instance. Tasks that use the awsvpc network mode are associated with an elastic network interface, not an Amazon EC2 instance.

Syntax

To declare this entity in your AWS CloudFormation template, use the following syntax:

JSON

{ "ContainerName" : String, "ContainerPort" : Integer, "LoadBalancerName" : String, "TargetGroupArn" : String }

YAML

ContainerName: String ContainerPort: Integer LoadBalancerName: String TargetGroupArn: String

Properties

ContainerName

The name of the container (as it appears in a container definition) to associate with the load balancer.

Required: No

Type: String

Update requires: Replacement

ContainerPort

The port on the container to associate with the load balancer. This port must correspond to a containerPort in the task definition the tasks in the service are using. For tasks that use the EC2 launch type, the container instance they are launched on must allow ingress traffic on the hostPort of the port mapping.

Required: Yes

Type: Integer

Update requires: Replacement

LoadBalancerName

The name of the load balancer to associate with the Amazon ECS service or task set.

A load balancer name is only specified when using a Classic Load Balancer. If you are using an Application Load Balancer or a Network Load Balancer this should be omitted.

Required: No

Type: String

Update requires: Replacement

TargetGroupArn

The full Amazon Resource Name (ARN) of the Elastic Load Balancing target group or groups associated with a service or task set.

A target group ARN is only specified when using an Application Load Balancer or Network Load Balancer. If you are using a Classic Load Balancer this should be omitted.

For services using the ECS deployment controller, you can specify one or multiple target groups. For more information, see Registering Multiple Target Groups with a Service in the Amazon Elastic Container Service Developer Guide.

For services using the CODE_DEPLOY deployment controller, you are required to define two target groups for the load balancer. For more information, see Blue/Green Deployment with CodeDeploy in the Amazon Elastic Container Service Developer Guide.

Important

If your service's task definition uses the awsvpc network mode (which is required for the Fargate launch type), you must choose ip as the target type, not instance, when creating your target groups because tasks that use the awsvpc network mode are associated with an elastic network interface, not an Amazon EC2 instance.

Required: No

Type: String

Update requires: Replacement

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