Terraform ERROR: Inappropriate value for attribute "requires_compatibilities": set of string required

Question

i get the following error message after terraform validate:

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Error: Incorrect attribute value type on .terraform/modules/backend_deployment/task_definition.tf line 4, in resource "aws_ecs_task_definition":

requires_compatibilities = "FARGATE"

Inappropriate value for attribute "requires_compatibilities": set of string required.

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This is my task_definition:

resource "aws_ecs_task_definition" "task_definition" {
  family = join("-", [local.cluster_values.backend_name, local.cluster_values.environment, local.cluster_values.random_id])
  network_mode = "awsvpc"
  requires_compatibilities = "FARGATE"
  cpu = 256
  memory = 512
  container_definitions = data.template_file.task_definition_template.rendered
  task_role_arn = local.cluster_values.task_role
}

Terraform-Doku says this:

requires_compatibilities - (Optional) Set of launch types required by the task. The valid values are EC2 and FARGATE.

Many thanks for helping !

Answer 1

According to the error message, the provider is expecting an argument value of type set(string), and you have provided string. You can fix this by providing a value consistent with the type expected by the provider according to the error message:

requires_compatibilities = ["FARGATE"]

Answer 2

Did not work for me

    // Apply the firewall rule to allow external IPs to access this instance
    tags = element(var.instance_tag, count.index)
}

variable "instance_tag" {
  type = list
  default = ["http-one", "http-two"]
}

Worked when added []

    // Apply the firewall rule to allow external IPs to access this instance
    tags = [element(var.instance_tag, count.index)]
}

variable "instance_tag" {
  type = list
  default = ["http-one", "http-two"]
}

There is another way to make it work as well with type = list(string)

    // Apply the firewall rule to allow external IPs to access this instance
    tags = element(var.instance_tag, count.index)
}

variable "instance_tag" {
  type = list(string)
  default = ["http-one", "http-two"]
}