Terraform module for creating a vpc

This module creates one VPC, by default it creates public and private subnets in all the availability zones for the selected region.

Terraform version

• Terraform 0.12: Pin module to ~> 2+, submit pull request to branch develop
• Terraform 0.11: Pin module to ~> 1.x, submit pull request to branch terraform011

Example usages:

See the examples for executable examples.

module "vpc" {
  source = "github.com/philips-software/terraform-aws-vpc.git?ref=2.2.0"

  environment = "my-awsome-project"
  aws_region  = "eu-west-1"

  // optional, defaults
  project                    = "Forest"
  create_private_hosted_zone = "false"  // default = true
  create_private_subnets     = "false"  // default = true

  // example to override default availability_zones
  availability_zones = ["eu-west-1a", "eu-west-1b", "eu-west-1c"]

  // add aditional tags
  tags = {
    my-tag = "my-new-tag"
  }
}

Inputs

Name	Description	Type	Default	Required
availability_zones	List to specify the availability zones for which subnes will be created. By default all availability zones will be used.	list	<list>	no
aws_region	The Amazon region	string	n/a	yes
cidr_block	The CIDR block used for the VPC.	string	"10.0.0.0/16"	no
create_private_hosted_zone	Indicate to create a private hosted zone.	bool	"true"	no
create_private_subnets	Indicates to create private subnets.	bool	"true"	no
create_s3_vpc_endpoint	Whether to create a VPC Endpoint for S3, so the S3 buckets can be used from within the VPC without using the NAT gateway.	bool	"true"	no
enable_create_defaults	Add tags to the default resources.	bool	"false"	no
environment	Environment name, will be added for resource tagging.	string	n/a	yes
private_subnet_tags	Map of tags to apply on the private subnets	map(string)	<map>	no
project	Project name, will be added for resource tagging.	string	""	no
public_subnet_map_public_ip_on_launch	Enable public ip creaton by default on EC2 instance launch.	bool	"false"	no
public_subnet_tags	Map of tags to apply on the public subnets	map(string)	<map>	no
tags	Map of tags to apply on the resources	map(string)	<map>	no

Outputs

Name	Description
availability_zones	List of the availability zones.
nat_gateway_public_ip	Public IP address of the NAT gateway.
private_dns_zone_id	ID of the the private DNS zone, optional.
private_domain_name	Private domain name, optional.
private_subnets	List of the private subnets.
private_subnets_route_table
public_subnets	List of the public subnets.
public_subnets_route_table
vpc_cidr	VPC CDIR.
vpc_id	ID of the VPC.

VPC for Amazon EKS

Amazon EKS (Elastic Kubernetes Service) requires that both VPCs and Subnets (public and private) are tagged specifically with certain values according to the [aws-eks-docs].

Therefore, if the VPC created using this module is targeted for EKS, tag it with

  tags = {
    "kubernetes.io/cluster/<cluster-name>" = "my-new-tag"
  }

Subnets Tags

As stated above, tagging the subnets is also mandatory for EKS Clusters. The tags for public and private subnets are as follows, respectively:

Public Subnet Tags

  public_subnet_tags = {
    "kubernetes.io/cluster/<cluster_name>" = "shared"
    "kubernetes.io/role/elb"               = "1"
  }

Private Subnet Tags

  private_subnet_tags = {
    "kubernetes.io/cluster/<cluster_name>" = "shared"
    "kubernetes.io/role/internal-elb"      = "1"
  }

Automated checks

Currently the automated checks are limited. In CI the following checks are done for the root and each example.

• lint: terraform validate and terraform fmt
• basic init / get check: terraform init -get -backend=false -input=false

Generation variable documentation

A markdown table for variables can be generated as follow. Generation requires awk and terraform-docs installed.

 .ci/bin/terraform-docs.sh markdown .

Philips Forest

This module is part of the Philips Forest.

                                                     ___                   _
                                                    / __\__  _ __ ___  ___| |_
                                                   / _\/ _ \| '__/ _ \/ __| __|
                                                  / / | (_) | | |  __/\__ \ |_
                                                  \/   \___/|_|  \___||___/\__|  

                                                                 Infrastructure

Talk to the forestkeepers in the forest-channel on Slack.

[aws-eks-docs]: https://docs.aws.amazon.com/eks/latest/userguide/network_reqs.html