main.tf

terraform {
  required_version = "~> 1.0"
  required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = "~> 3.0"
    }
  }
}

provider "aws" {
  region = var.region
}

data "aws_ami" "ubuntu" {
  most_recent = true

  filter {
    name   = "name"
    values = ["ubuntu/images/hvm-ssd/ubuntu-*20*-amd64-server-*"]
  }

  filter {
    name   = "virtualization-type"
    values = ["hvm"]
  }

  owners = ["099720109477"] # Canonical
}

resource "aws_vpc" "vpc" {
  cidr_block           = var.cidr_vpc
  enable_dns_support   = true
  enable_dns_hostnames = true
}

resource "aws_internet_gateway" "igw" {
  vpc_id = aws_vpc.vpc.id
}

resource "aws_subnet" "subnet_public" {
  vpc_id     = aws_vpc.vpc.id
  cidr_block = var.cidr_subnet
}

resource "aws_route_table" "rtb_public" {
  vpc_id = aws_vpc.vpc.id

  route {
    cidr_block = "0.0.0.0/0"
    gateway_id = aws_internet_gateway.igw.id
  }
}

resource "aws_route_table_association" "rta_subnet_public" {
  subnet_id      = aws_subnet.subnet_public.id
  route_table_id = aws_route_table.rtb_public.id
}

resource "aws_security_group" "sg_22_80" {
  name   = "sg_22"
  vpc_id = aws_vpc.vpc.id

  # SSH access from the VPC
  ingress {
    from_port   = 22
    to_port     = 22
    protocol    = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
  }

  ingress {
    from_port   = 80
    to_port     = 80
    protocol    = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
  }


  ingress {
    from_port   = 8080
    to_port     = 8080
    protocol    = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
  }

  egress {
    from_port   = 0
    to_port     = 0
    protocol    = "-1"
    cidr_blocks = ["0.0.0.0/0"]
  }
}

data "template_file" "user_data" {
  template = file("../scripts/ssh-run-guided-install.yaml")
  vars = {
    new_relic_account_id = var.new_relic_account_id
    new_relic_api_key    = var.new_relic_api_key
    new_relic_region     = var.new_relic_region
  }
}

resource "aws_instance" "web" {
  for_each = toset(["first", "second", "third"])

  ami                         = data.aws_ami.ubuntu.id
  instance_type               = "t2.micro"
  subnet_id                   = aws_subnet.subnet_public.id
  vpc_security_group_ids      = [aws_security_group.sg_22_80.id]
  associate_public_ip_address = true
  user_data                   = data.template_file.user_data.rendered

  tags = {
    Name = "Learn-CloudInit"
  }
}

output "public_ip" {
  value = toset([
    for i in aws_instance.web : i.public_ip
  ])
}