Update 'terraform.tf'

terraform.tf

@@ -1,2 +1,87 @@
+provider "aws" {
+  region = var.region
+}
+
+data "aws_vpc" "default" {
+  id = var.vpc_id
+}
+resource "aws_security_group" "instance_sg" {
+  name        = "instance_sg"
+  description = "Security group for instances"
+
+  ingress {
+    from_port   = 22
+    to_port     = 22
+    protocol    = "tcp"
+    cidr_blocks = [data.aws_vpc.default.cidr_block]  #  restrict SSH access
+  }
+}
+
+resource "aws_security_group" "alb_sg" {
+  name        = "alb_sg"
+  description = "Security group for ALB"
+
+  ingress {
+    from_port   = 80
+    to_port     = 80
+    protocol    = "tcp"
+    cidr_blocks = [data.aws_vpc.default.cidr_block]  # example
+  }
+
+  ingress {
+    from_port   = 443
+    to_port     = 443
+    protocol    = "tcp"
+    cidr_blocks = [data.aws_vpc.default.cidr_block]  # example
+  }
+}
+
+resource "aws_launch_configuration" "example" {
+  name_prefix   = "example-"
+  image_id      = var.ami_id
+  instance_type = "t2.micro"
+  
+  security_groups = [aws_security_group.instance_sg.id]
+
+  user_data = <<-EOF
+              #!/bin/bash
+              apt update
+              apt upgrade -y
+              EOF
+
+  lifecycle {
+    create_before_destroy = true
+  }
+}
+
+resource "aws_autoscaling_group" "my-asg" {
+  name                 = "my-asg"
+  launch_configuration = aws_launch_configuration.example.name
+  min_size             = 2
+  max_size             = 5
+  desired_capacity     = 2
+
+  vpc_zone_identifier = var.subnet_ids
+
+  instance_refresh {
+    strategy = "rolling"
+  }
+}
+
+resource "aws_lb" "my-lb" {
+  name               = "my-lb"
+  internal           = false
+  load_balancer_type = "application"
+  subnets            = var.subnet_ids
+
+  security_groups = var.alb_security_group_ids
+}
+
+resource "aws_lb_target_group" "my-tg" {
+  name     = "my-tg"
+  port     = 80
+  protocol = "HTTP"
+  vpc_id   = var.vpc_id
+}