shared_vpc_module.tf

#
# VPC Resources
#  * VPC
#  * Subnets
#  * Internet Gateway
#  * Route Tables
#  * Sec Groups

module "vpc" {
  source = "terraform-aws-modules/vpc/aws"

  name = "${var.environment}-vpc"
  cidr = var.cidr

  azs             = var.azs
  private_subnets = var.private_subnets
  public_subnets  = var.public_subnets

  enable_nat_gateway     = true
  single_nat_gateway     = true
  one_nat_gateway_per_az = false

  private_subnet_tags = {
    "kubernetes.io/role/internal-elb" = 1
  }

  public_subnet_tags = {
    "kubernetes.io/role/elb" = 1
  }

  tags = {
    Environment                                = var.environment
    Application                                = "network"
    "kubernetes.io/cluster/${var.cluster_name}" = "shared"
  }
}

// variables.tf

variable "environment" {
  type        = string
  default     = "krypton"
  description = "Name prefix"
}

variable "cidr" {
  type        = string
  default     = "10.0.0.0/16"
  description = "vpc cidr"
}

variable "azs" {
  type        = list
  description = "Avaibility zones list"
}

variable "private_subnets" {
  type        = list
  description = "list of private subnets in the vpc"
}

variable "public_subnets" {
  type        = list
  description = "public subnets list"
}

variable "ingress_ips" {
  type        = list
  description = "List of Ingress IPs"
}
variable "cluster_name" {
  type        = string
  description = "FQDN cluster name"
}

// outputs.tf

output "vpc_id" {
  value = module.vpc.vpc_id
}

output "vpc_cidr_block" {
  value = module.vpc.vpc_cidr_block
}

output "public_subnet_ids" {
  value = module.vpc.public_subnets
}

output "public_route_table_ids" {
  value = module.vpc.public_route_table_ids
}

output "private_subnet_ids" {
  value = module.vpc.private_subnets
}

output "private_route_table_ids" {
  value = module.vpc.private_route_table_ids
}

output "default_security_group_id" {
  value = module.vpc.default_security_group_id
}

output "nat_gateway_ids" {
  value = module.vpc.natgw_ids
}