vpc.tf

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

# VPC
resource "aws_vpc" "terra_vpc" {
  cidr_block       = "${var.vpc_cidr}"
  enable_dns_hostnames = true
  tags =  {
    Name = "Terraform_VPC"
  }
}

# Internet Gateway
resource "aws_internet_gateway" "terra_igw" {
  vpc_id = "${aws_vpc.terra_vpc.id}"
  tags =  {
    Name = "main"
  }
}

# Subnets : public
resource "aws_subnet" "public" {
  count = "${length(var.subnets_cidr)}"
  vpc_id = "${aws_vpc.terra_vpc.id}"
  cidr_block = "${element(var.subnets_cidr,count.index)}"
  availability_zone = "${element(var.azs,count.index)}"
  map_public_ip_on_launch = true
  tags =  {
    Name = "Subnet-${count.index+1}"
  }
}

# Route table: attach Internet Gateway 
resource "aws_route_table" "public_rt" {
  vpc_id = "${aws_vpc.terra_vpc.id}"
  route {
    cidr_block = "0.0.0.0/0"
    gateway_id = "${aws_internet_gateway.terra_igw.id}"
  }
  tags =  {
    Name = "publicRouteTable"
  }
}

# Route table association with public subnets
resource "aws_route_table_association" "a" {
  count = "${length(var.subnets_cidr)}"
  subnet_id      = "${element(aws_subnet.public.*.id,count.index)}"
  route_table_id = "${aws_route_table.public_rt.id}"
}

resource "aws_security_group" "webservers" {
  name        = "allow_http"
  description = "Allow http inbound traffic"
  vpc_id      = "${aws_vpc.terra_vpc.id}"

  ingress {
    from_port   = 80
    to_port     = 80
    protocol    = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
  }
ingress {
    description = "ssh from VPC"
    from_port   = 22
    to_port     = 22
    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"]
  }
}

resource "aws_instance" "webservers" {
	count = var.number_instances
	ami = var.amiid
	instance_type = var.instance_type
        
	security_groups = ["${aws_security_group.webservers.id}"]
	subnet_id = "${element(aws_subnet.public.*.id,count.index)}"
        user_data = "${file("install_httpd.sh")}"
        key_name  = var.key
	tags =  {
	  Name = "Server-${count.index}"
	}
}