Terraform: Can't create ECS service without Load Balancer

[Dgadavin]

Good day

Terraform Version

Version 0.8.7

I try to create ECS service without Load Balancer. In terraform docs this step maked as Optional.

resource "aws_ecs_service" "elast-alert" {
    name = "${module.elast_alert_naming.aws_ecs_service}"
    cluster = "${aws_ecs_cluster.default.id}"
    task_definition = "${aws_ecs_task_definition.elast-alert.arn}"
    desired_count   = "1"
    iam_role  = "${aws_iam_role.default.arn}"
    deployment_maximum_percent = 100
    deployment_minimum_healthy_percent = 0
}

Error

Error applying plan:

1 error(s) occurred:

* aws_ecs_service.elast-alert: InvalidParameterException: A role was passed, but no load balancers were present.
    status code: 400, request id: 53804203-f82d-11e6-816d-cd1a325f669e

Terraform does not automatically rollback in the face of errors.
Instead, your Terraform state file has been partially updated with
any resources that successfully completed. Please address the error
above and apply again to incrementally change your infrastructure.

In AWS I can create ECS service without ELB. Could I do the same with Terraform?

[MattiasGees]

@Dgadavin I think if you remove the iam_role parameter from you resource this will be fixed. In the AWS documentation it states that when you define an iam_role you also have to define a load balancer.

http://docs.aws.amazon.com/AmazonECS/latest/developerguide/service_definition_paramters.html

role
The name or full Amazon Resource Name (ARN) of the IAM role that allows Amazon ECS to make calls to your load balancer on your behalf. This parameter is required if you are using a load balancer with your service. If you specify the role parameter, you must also specify a load balancer object with the loadBalancers parameter.

[Dgadavin]

Thanks. Will check it.

[Dgadavin]

Thanks @MattiasGees. Your solution work fine.

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