aws vpc creation using terraform
provider "aws" {
region = "${var.region}"
access_key = "${var.access_key}"
secret_key = "${var.secret_key}"
}
# VPC resources: This will create 1 VPC with 4 Subnets, 1 Internet Gateway, 4 Route Tables.
resource "aws_vpc" "default" {
cidr_block = var.cidr_block
enable_dns_support = true
enable_dns_hostnames = true
}
resource "aws_internet_gateway" "default" {
vpc_id = aws_vpc.default.id
}
resource "aws_route_table" "private" {
count = length(var.private_subnet_cidr_blocks)
vpc_id = aws_vpc.default.id
}
resource "aws_route" "private" {
count = length(var.private_subnet_cidr_blocks)
route_table_id = aws_route_table.private[count.index].id
destination_cidr_block = "0.0.0.0/0"
nat_gateway_id = aws_nat_gateway.default[count.index].id
}
resource "aws_route_table" "public" {
vpc_id = aws_vpc.default.id
}
resource "aws_route" "public" {
route_table_id = aws_route_table.public.id
destination_cidr_block = "0.0.0.0/0"
gateway_id = aws_internet_gateway.default.id
}
resource "aws_subnet" "private" {
count = length(var.private_subnet_cidr_blocks)
vpc_id = aws_vpc.default.id
cidr_block = var.private_subnet_cidr_blocks[count.index]
availability_zone = var.availability_zones[count.index]
}
resource "aws_subnet" "public" {
count = length(var.public_subnet_cidr_blocks)
vpc_id = aws_vpc.default.id
cidr_block = var.public_subnet_cidr_blocks[count.index]
availability_zone = var.availability_zones[count.index]
map_public_ip_on_launch = true
}
resource "aws_route_table_association" "private" {
count = length(var.private_subnet_cidr_blocks)
subnet_id = aws_subnet.private[count.index].id
route_table_id = aws_route_table.private[count.index].id
}
resource "aws_route_table_association" "public" {
count = length(var.public_subnet_cidr_blocks)
subnet_id = aws_subnet.public[count.index].id
route_table_id = aws_route_table.public.id
}
# NAT resources: This will create 2 NAT gateways in 2 Public Subnets for 2 different Private Subnets.
resource "aws_eip" "nat" {
count = length(var.public_subnet_cidr_blocks)
vpc = true
}
resource "aws_nat_gateway" "default" {
depends_on = ["aws_internet_gateway.default"]
count = length(var.public_subnet_cidr_blocks)
allocation_id = aws_eip.nat[count.index].id
subnet_id = aws_subnet.public[count.index].id
}
