refactor: Refactoring to match the rest of terraform-aws-modules (#1583)

examples/_bootstrap/README.md

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+# Various bootstrap resources required for  other EKS examples
+
+Configuration in this directory creates some resources required in other EKS examples (such as VPC).
+
+The resources created here are free (no NAT gateways here) and they can reside in test AWS account.
+
+## Usage
+
+To run this example you need to execute:
+
+```bash
+$ terraform init
+$ terraform plan
+$ terraform apply
+```
+
+Note that this example may create resources which cost money. Run `terraform destroy` when you don't need these resources.
+
+<!-- BEGINNING OF PRE-COMMIT-TERRAFORM DOCS HOOK -->
+## Requirements
+
+| Name | Version |
+|------|---------|
+| <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | >= 0.13.1 |
+| <a name="requirement_aws"></a> [aws](#requirement\_aws) | >= 3.22.0 |
+| <a name="requirement_kubernetes"></a> [kubernetes](#requirement\_kubernetes) | >= 1.11 |
+| <a name="requirement_random"></a> [random](#requirement\_random) | >= 2.1 |
+
+## Providers
+
+| Name | Version |
+|------|---------|
+| <a name="provider_aws"></a> [aws](#provider\_aws) | >= 3.22.0 |
+| <a name="provider_random"></a> [random](#provider\_random) | >= 2.1 |
+
+## Modules
+
+| Name | Source | Version |
+|------|--------|---------|
+| <a name="module_vpc"></a> [vpc](#module\_vpc) | terraform-aws-modules/vpc/aws | ~> 3.0 |
+
+## Resources
+
+| Name | Type |
+|------|------|
+| [random_string.suffix](https://registry.terraform.io/providers/hashicorp/random/latest/docs/resources/string) | resource |
+| [aws_availability_zones.available](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/availability_zones) | data source |
+
+## Inputs
+
+No inputs.
+
+## Outputs
+
+| Name | Description |
+|------|-------------|
+| <a name="output_cluster_name"></a> [cluster\_name](#output\_cluster\_name) | Name of EKS Cluster used in tags for subnets |
+| <a name="output_region"></a> [region](#output\_region) | AWS region |
+| <a name="output_vpc"></a> [vpc](#output\_vpc) | Complete output of VPC module |
+<!-- END OF PRE-COMMIT-TERRAFORM DOCS HOOK -->

examples/_bootstrap/main.tf

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+provider "aws" {
+  region = local.region
+}
+
+locals {
+  region   = "eu-west-1"
+  name     = "bootstrap-example"
+  vpc_cidr = "10.0.0.0/16"
+
+  cluster_name = "test-eks-${random_string.suffix.result}"
+}
+
+data "aws_availability_zones" "available" {}
+
+resource "random_string" "suffix" {
+  length  = 8
+  special = false
+}
+
+################################################################################
+# Supporting Resources
+################################################################################
+
+module "vpc" {
+  source  = "terraform-aws-modules/vpc/aws"
+  version = "~> 3.0"
+
+  name = local.name
+  cidr = "10.0.0.0/16"
+
+  azs             = data.aws_availability_zones.available.names
+  public_subnets  = [for k, v in data.aws_availability_zones.available.names : cidrsubnet(local.vpc_cidr, 8, k)]
+  private_subnets = [for k, v in data.aws_availability_zones.available.names : cidrsubnet(local.vpc_cidr, 8, k + 10)]
+
+  # NAT Gateway is disabled in the examples primarily to save costs and be able to recreate VPC faster.
+  enable_nat_gateway = false
+  single_nat_gateway = false
+
+  enable_dns_hostnames = true
+
+  public_subnet_tags = {
+    "kubernetes.io/cluster/${local.cluster_name}" = "shared"
+    "kubernetes.io/role/elb"                      = "1"
+  }
+
+  private_subnet_tags = {
+    "kubernetes.io/cluster/${local.cluster_name}" = "shared"
+    "kubernetes.io/role/internal-elb"             = "1"
+  }
+}

examples/_bootstrap/outputs.tf

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+output "region" {
+  description = "AWS region"
+  value       = local.region
+}
+
+output "cluster_name" {
+  description = "Name of EKS Cluster used in tags for subnets"
+  value       = local.cluster_name
+}
+
+output "vpc" {
+  description = "Complete output of VPC module"
+  value       = module.vpc
+}

examples/_bootstrap/versions.tf

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+terraform {
+  required_version = ">= 0.13.1"
+
+  required_providers {
+    aws        = ">= 3.22.0"
+    random     = ">= 2.1"
+    kubernetes = ">= 1.11"
+  }
+}