ECS Fargate sample topology

main.tf

provider "aws" {
  region = "${var.region}"
}

resource "aws_ecs_cluster" "ecs_cluster" {
  name = "${var.cluster_name}"
}

resource "aws_ecs_task_definition" "task" {
  family                   = "${var.service_name}"
  container_definitions    = "${data.template_file.task_def.rendered}"
  cpu                      = "${var.cpu}"
  memory                   = "${var.memory}"
  requires_compatibilities = ["FARGATE"]
  network_mode             = "awsvpc"
  execution_role_arn        = "${var.iam_role_arn}"
}

resource "aws_ecs_service" "service" {
  name            = "${var.service_name}"
  cluster         = "${aws_ecs_cluster.ecs_cluster.name}"
  task_definition = "${aws_ecs_task_definition.task.arn}"
  desired_count   = 1
  launch_type     = "FARGATE"

  network_configuration {
    assign_public_ip = "true"
    security_groups = ["${var.security_group}"]
    subnets         = ["${var.subnet}"]
  }
}

data "template_file" "task_def" {
  template = "${file("task_def.json")}"

  vars {
    name  = "${var.service_name}"
    image = "${var.image}"
    port  = "${var.port}"
  }
}

task_def.json

[
  {
    "name": "${name}",
    "image": "${image}",
    "networkMode": "awsvpc",
    "portMappings": [
      {
        "containerPort": ${port},
        "hostPort": ${port}
      }
    ]
  }
]

variables.tf

variable "region" {
  default = "us-east-1"
}

variable "cluster_name" {
  default = "test"
}

variable "service_name" {
  default = "test"
}

variable "cpu" {
  default = 256
}

variable "memory" {
  default = 512
}

variable "image" {}
variable "port" {}

# AWS REQUIRED RESOURCES

variable "iam_role_arn" {}
variable "security_group" {}
variable "subnet" {}