How do I deploy an ECS Fargate service with an ALB?

[yorinasub17]

I'm trying to configure the ecs-service module in Fargate mode that is linked to an ALB. I have figured out the variable configuration for setting up the service to deploy in Fargate mode, but I am struggling to figure out what variables I need to configure to link it to an ALB. Which variables should I configure?

NOTE: I already tried copying the ecs-service module block from the docker-fargate-service-with-alb, but I am getting the following error:

Error: failed creating ECS service (SERVICE_NAME): InvalidParameterException: The target group with 
targetGroupArn arn:aws:elasticloadbalancing:eu-west-1:xxxxxxxxx:targetgroup/SERVICE_NAME/c5717e184d65dcf7
does not have an associated load balancer

[denis256]

Hi, without ecs-service definition is not clear how which variables got passed to module, but should be set elb_target_groups on ecs-service which should reference alb

[denis256]

Additionally, found that a similar error occurs if there is no aws_alb_listener_rule defined.

Example definition can be found in:
https://github.com/gruntwork-io/terraform-aws-ecs/blob/master/examples/docker-fargate-service-with-alb/main.tf#L251

In my tests, I commented aws_alb_listener_rule from docker-fargate-service-with-alb and get the same error during apply