added network related infra

network.tf

@@ -0,0 +1,86 @@
+# https://docs.aws.amazon.com/glue/latest/dg/set-up-vpc-dns.html
+resource "aws_vpc" "this" {
+  cidr_block = var.vpc_cidr
+  # https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/vpc#enable_dns_support
+  enable_dns_support = true
+  # https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/vpc#enable_dns_hostnames
+  enable_dns_hostnames = true
+  tags = {
+    "Name" = "app-4"
+  }
+}
+data "aws_availability_zones" "available" {
+  state = "available"
+}
+resource "aws_subnet" "private" {
+  count             = length(var.subnet_cidr_private)
+  vpc_id            = aws_vpc.this.id
+  cidr_block        = var.subnet_cidr_private[count.index]
+  availability_zone = data.aws_availability_zones.available.names[(count.index) % length(data.aws_availability_zones.available.names)]
+  tags = {
+    "Name" = "app-4-private-${count.index + 1}"
+  }
+}
+resource "aws_subnet" "public" {
+  count             = length(var.subnet_cidr_public)
+  vpc_id            = aws_vpc.this.id
+  cidr_block        = var.subnet_cidr_public[count.index]
+  availability_zone = data.aws_availability_zones.available.names[(count.index) % length(data.aws_availability_zones.available.names)]
+  tags = {
+    "Name" = "app-4-public-${count.index + 1}"
+  }
+}
+resource "aws_route_table" "private" {
+  count  = length(var.subnet_cidr_private)
+  vpc_id = aws_vpc.this.id
+  tags = {
+    "Name" = "app-4-private-route-table-${count.index + 1}"
+  }
+}
+resource "aws_route_table" "public" {
+  vpc_id = aws_vpc.this.id
+  tags = {
+    "Name" = "app-4-public-route-table"
+  }
+}
+resource "aws_route_table_association" "private" {
+  count          = length(var.subnet_cidr_private)
+  subnet_id      = element(aws_subnet.private.*.id, count.index)
+  route_table_id = aws_route_table.private[count.index].id
+}
+resource "aws_route_table_association" "public" {
+  count          = length(var.subnet_cidr_public)
+  subnet_id      = element(aws_subnet.public.*.id, count.index)
+  route_table_id = aws_route_table.public.id
+}
+resource "aws_internet_gateway" "this-igw" {
+  vpc_id = aws_vpc.this.id
+  tags = {
+    "Name" = "app-4-gateway"
+  }
+}
+resource "aws_route" "internet-route" {
+  destination_cidr_block = "0.0.0.0/0"
+  route_table_id         = aws_route_table.public.id
+  gateway_id             = aws_internet_gateway.this-igw.id
+}
+resource "aws_eip" "nat_gateway" {
+  count  = length(var.subnet_cidr_public)
+  domain = "vpc"
+  #checkov:skip=CKV2_AWS_19: The IP is attached to the NAT gateway
+}
+resource "aws_nat_gateway" "public" {
+  count         = length(var.subnet_cidr_public)
+  subnet_id     = element(aws_subnet.public.*.id, count.index)
+  allocation_id = aws_eip.nat_gateway[count.index].id
+  depends_on    = [aws_internet_gateway.this-igw]
+  tags = {
+    "Name" = "app-4-NAT-${count.index + 1}"
+  }
+}
+resource "aws_route" "private-route" {
+  count                  = length(var.subnet_cidr_private)
+  destination_cidr_block = "0.0.0.0/0"
+  route_table_id         = aws_route_table.private[count.index].id
+  nat_gateway_id         = aws_nat_gateway.public[count.index].id
+}

variable.tf

@@ -17,4 +17,18 @@ variable "secret_key" {
   type        = string
   sensitive   = true
   default     = ""
+}
+variable "vpc_cidr" {
+  description = "the vpc cidr"
+  default     = "10.20.32.0/25"
+}
+variable "subnet_cidr_private" {
+  description = "cidr blocks for the private subnets"
+  default     = ["10.20.30.0/27", "10.20.30.32/27", "10.20.30.64/27"]
+  type        = list(any)
+}
+variable "subnet_cidr_public" {
+  description = "cidr blocks for the public subnets"
+  default     = ["10.20.30.96/27"]
+  type        = list(any)
 }