initial AWS terraform (#180)

* initial AWS terraform

terraform/aws/modules/load_balancer/main.tf

@@ -0,0 +1,48 @@
+terraform {
+  required_providers {
+    aws = {
+      source  = "hashicorp/aws"
+      version = "~> 4.0"
+    }
+  }
+}
+
+resource "aws_lb" "front_end" {
+  name               = var.name
+  internal           = false
+  load_balancer_type = "network"
+  subnets            = [var.subnet]
+
+  tags = {
+    Name = "loadbalancer"
+  }
+
+  enable_cross_zone_load_balancing = true
+}
+
+resource "aws_lb_target_group" "front_end" {
+  name     = var.name
+  port     = var.port
+  protocol = "TCP"
+  vpc_id   = var.vpc
+
+  health_check {
+    port     = var.port
+    protocol = "TCP"
+  }
+
+  lifecycle {
+    create_before_destroy = true
+  }
+}
+
+resource "aws_lb_listener" "front_end" {
+  load_balancer_arn = aws_lb.front_end.arn
+  port              = var.port
+  protocol          = "TCP"
+
+  default_action {
+    type             = "forward"
+    target_group_arn = aws_lb_target_group.front_end.arn
+  }
+}

terraform/aws/modules/load_balancer/output.tf

@@ -0,0 +1,3 @@
+output "target_group_arn" {
+  value = aws_lb_target_group.front_end.arn
+}

terraform/aws/modules/load_balancer/variables.tf

@@ -0,0 +1,19 @@
+variable "name" {
+  type        = string
+  description = "Name of the load balancer."
+}
+
+variable "port" {
+  type        = string
+  description = "Port of the load balancer."
+}
+
+variable "vpc" {
+  type        = string
+  description = "ID of the VPC."
+}
+
+variable "subnet" {
+  type        = string
+  description = "ID of the subnets."
+}