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Merge pull request #21 from Aswin-Vijayan/master
 [TEC-56][Add]- Added conditions to nat-gateway
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‎README.md‎

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@@ -22,6 +22,31 @@ terraform destroy \
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-backend-config="dynamodb_table=terraform-state-lock"
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```
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#### VPC Provisioning
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cd into the `environments/dev/vpc` directory and run the following commands:
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1. Init Terraform in the directory `environments/dev/vpc`
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```
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terraform init
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```
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2. To preview the changes in code
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```
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terraform plan -var-file=../../../vars/dev/vpc.tfvars
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```
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3. To apply the changes
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```
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terraform apply -var-file=../../../vars/dev/vpc.tfvars
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```
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4. To destroy the resources created using the code
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```
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terraform destroy -var-file=../../../vars/dev/vpc.tfvars
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#### RDS Provisioning
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cd into the `environments/dev/rds` directory and run the following commands:

‎environments/dev/vpc/main.tf‎

Lines changed: 18 additions & 10 deletions
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@@ -7,14 +7,22 @@ provider "aws" {
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module "vpc" {
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source = "../../../modules/vpc"
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name = "eks-vpc"
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region = "us-west-2"
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project = "EKS Demo"
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environment = "dev"
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vpc_cidr_block = "10.0.0.0/16"
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public_subnet_cidr_blocks = ["10.0.1.0/24", "10.0.2.0/24", "10.0.3.0/24"]
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app_subnet_cidr_blocks = ["10.0.4.0/24", "10.0.5.0/24", "10.0.6.0/24"]
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db_subnet_cidr_blocks = ["10.0.7.0/24", "10.0.8.0/24", "10.0.9.0/24"]
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management_subnet_cidr_blocks = ["10.0.10.0/24", "10.0.11.0/24", "10.0.12.0/24"]
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availability_zones = ["us-west-2a", "us-west-2b", "us-west-2c"]
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region = var.region
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vpc_cidr_block = var.vpc_cidr_block
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instance_tenancy = var.instance_tenancy
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enable_dns_support = var.enable_dns_support
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enable_dns_hostnames = var.enable_dns_hostnames
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domain = var.domain
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create_nat_gateway = var.create_nat_gateway
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destination_cidr_block = var.destination_cidr_block
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map_public_ip_on_launch = var.map_public_ip_on_launch
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public_subnet_cidr_blocks = var.public_subnet_cidr_blocks
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app_subnet_cidr_blocks = var.app_subnet_cidr_blocks
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db_subnet_cidr_blocks = var.db_subnet_cidr_blocks
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management_subnet_cidr_blocks = var.management_subnet_cidr_blocks
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availability_zones = var.availability_zones
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owner = var.owner
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environment = var.environment
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cost_center = var.cost_center
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application = var.application
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}

‎environments/dev/vpc/variables.tf‎

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# Common Variables
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variable "tags" {
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default = {}
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type = map(string)
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description = "Extra tags to attach to the VPC resources"
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}
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variable "region" {
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type = string
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description = "Region of the VPC"
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}
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# VPC Variables
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variable "vpc_cidr_block" {
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type = string
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description = "CIDR block for the VPC"
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}
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# Subnet Varaibles
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variable "public_subnet_cidr_blocks" {
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type = list(any)
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description = "List of public subnet CIDR blocks"
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}
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variable "app_subnet_cidr_blocks" {
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type = list(any)
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description = "List of application subnet CIDR blocks"
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}
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variable "db_subnet_cidr_blocks" {
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type = list(any)
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description = "List of Database subnet CIDR blocks"
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}
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variable "management_subnet_cidr_blocks" {
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type = list(any)
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description = "List of management subnet CIDR blocks"
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}
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variable "availability_zones" {
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type = list(any)
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description = "List of availability zones"
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}
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variable "create_nat_gateway" {
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type = bool
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description = "whether to create a NAT gateway or not"
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}
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variable "owner" {
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type = string
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description = "Name of owner"
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}
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variable "environment" {
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type = string
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description = "The environment name for the resources."
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}
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variable "cost_center" {
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type = string
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description = "Name of cost-center for this alb-asg"
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}
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variable "application" {
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type = string
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description = "Name of the application"
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}
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variable "instance_tenancy" {
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type = string
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description = "Set instance-tenancy"
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}
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variable "enable_dns_support" {
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type = bool
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description = "whether to enable DNS support or not"
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}
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variable "enable_dns_hostnames" {
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type = bool
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description = "whether to enable DNS hostnames or not"
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}
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variable "domain" {
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type = string
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description = "Set the domain of eip"
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}
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variable "destination_cidr_block" {
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type = string
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description = "Set the destination cidr block"
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}
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variable "map_public_ip_on_launch" {
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type = bool
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description = "whether to map public ip on launch or not"
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}
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‎modules/vpc/Untitled-1‎

Whitespace-only changes.

‎modules/vpc/internet-gateway.tf‎

Lines changed: 5 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -3,9 +3,11 @@ resource "aws_internet_gateway" "main" {
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tags = merge(
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{
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Name = "InternetGateway",
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Project = var.project,
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Environment = var.environment
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Name = "${var.environment}-${var.application}-internet-gateway",
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Environment = var.environment,
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Owner = var.owner,
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CostCenter = var.cost_center,
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Application = var.application
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},
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var.tags
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)

‎modules/vpc/nat-gateway.tf‎

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Original file line numberDiff line numberDiff line change
@@ -1,19 +1,22 @@
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resource "aws_eip" "main" {
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count = 3
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domain = "vpc"
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count = var.create_nat_gateway ? 1 : 0
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domain = var.domain
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}
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resource "aws_nat_gateway" "main" {
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count = length(var.subnet_ids)
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allocation_id = aws_eip.main[count.index].id
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count = var.create_nat_gateway ? 1 : 0
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allocation_id = aws_eip.main[0].id
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subnet_id = aws_subnet.public[0].id
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depends_on = [aws_internet_gateway.main]
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tags = merge(
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tags = merge(
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{
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Name = "NATGateway",
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Project = var.project,
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Environment = var.environment
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Name = "${var.environment}-${var.application}-nat-gateway",
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Environment = var.environment,
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Owner = var.owner,
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CostCenter = var.cost_center,
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Application = var.application
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},
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var.tags
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)
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}
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}

‎modules/vpc/route-tables.tf‎

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Original file line numberDiff line numberDiff line change
@@ -3,102 +3,85 @@ resource "aws_route_table" "public" {
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tags = merge(
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{
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Name = "PublicRouteTable",
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Project = var.project,
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Environment = var.environment
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Name = "${var.environment}-${var.application}-public-route-table",
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Environment = var.environment,
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Owner = var.owner,
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CostCenter = var.cost_center,
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Application = var.application
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},
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var.tags
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)
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}
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resource "aws_route" "public" {
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route_table_id = aws_route_table.public.id
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destination_cidr_block = "0.0.0.0/0"
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destination_cidr_block = var.destination_cidr_block
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gateway_id = aws_internet_gateway.main.id
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}
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resource "aws_route_table_association" "public" {
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count = length(var.public_subnet_cidr_blocks)
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subnet_id = aws_subnet.public[count.index].id
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route_table_id = aws_route_table.public.id
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}
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resource "aws_route_table" "app" {
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vpc_id = aws_vpc.main.id
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tags = merge(
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{
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Name = "AppRouteTable",
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Project = var.project,
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Environment = var.environment
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Name = "${var.environment}-${var.application}-app-route-table",
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Environment = var.environment,
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Owner = var.owner,
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CostCenter = var.cost_center,
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Application = var.application
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},
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var.tags
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)
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}
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resource "aws_route" "app" {
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count = length(aws_nat_gateway.main)
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route_table_id = aws_route_table.app.id
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destination_cidr_block = "0.0.0.0/0"
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gateway_id = aws_nat_gateway.main[count.index].id
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count = var.create_nat_gateway ? 1 : 0
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route_table_id = aws_route_table.app.id
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destination_cidr_block = var.destination_cidr_block
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nat_gateway_id = aws_nat_gateway.main[count.index].id
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}
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resource "aws_route_table_association" "app" {
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count = length(var.app_subnet_cidr_blocks)
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subnet_id = aws_subnet.app[count.index].id
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route_table_id = aws_route_table.app.id
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}
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#
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resource "aws_route_table" "db" {
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vpc_id = aws_vpc.main.id
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tags = merge(
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{
59-
Name = "DbRouteTable",
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Project = var.project,
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Environment = var.environment
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Name = "${var.environment}-${var.application}-db-route-table",
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Environment = var.environment,
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Owner = var.owner,
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CostCenter = var.cost_center,
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Application = var.application
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},
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var.tags
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)
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}
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resource "aws_route" "db" {
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count = length(aws_nat_gateway.main)
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route_table_id = aws_route_table.db.id
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destination_cidr_block = "0.0.0.0/0"
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gateway_id = aws_nat_gateway.main[count.index].id
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}
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resource "aws_route_table_association" "db" {
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count = length(var.db_subnet_cidr_blocks)
76-
subnet_id = aws_subnet.db[count.index].id
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route_table_id = aws_route_table.db.id
61+
count = var.create_nat_gateway ? 1 : 0
62+
route_table_id = aws_route_table.db.id
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destination_cidr_block = var.destination_cidr_block
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nat_gateway_id = aws_nat_gateway.main[count.index].id
7865
}
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8067
resource "aws_route_table" "management" {
8168
vpc_id = aws_vpc.main.id
8269

8370
tags = merge(
8471
{
85-
Name = "ManagementRouteTable",
86-
Project = var.project,
87-
Environment = var.environment
72+
Name = "${var.environment}-${var.application}-management-route-table",
73+
Environment = var.environment,
74+
Owner = var.owner,
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CostCenter = var.cost_center,
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Application = var.application
8877
},
8978
var.tags
9079
)
9180
}
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9382
resource "aws_route" "management" {
94-
count = length(aws_nat_gateway.main)
95-
route_table_id = aws_route_table.management.id
96-
destination_cidr_block = "0.0.0.0/0"
97-
gateway_id = aws_nat_gateway.main[count.index].id
98-
}
99-
100-
resource "aws_route_table_association" "management" {
101-
count = length(var.management_subnet_cidr_blocks)
102-
subnet_id = aws_subnet.management[count.index].id
103-
route_table_id = aws_route_table.management.id
83+
count = var.create_nat_gateway ? 1 : 0
84+
route_table_id = aws_route_table.management.id
85+
destination_cidr_block = var.destination_cidr_block
86+
nat_gateway_id = aws_nat_gateway.main[count.index].id
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}

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