Module network

Table of Contents

• Description
• Usage
  • Input parameters
  • Output attributes

Description

The module is used to create VPC and it's basic components

• VPC

• Public Subnets (number is determined from the number of AZ's).

• Public Routing tables.

• Internet Gateway attached to the Public Routing table.

• Private Subnets (number is determined from the number of AZ's).

• Private Routing Tables

• Nat Gateway attached to the routing tables.

• Network ACL that address traffic from VPC to S3.

• Bastion Host

• AWS Subnet groups

Usage

module "network" {
  source       = "../../modules/network"
  main_vars    = "${var.main_vars}"
  network_vars = "${var.network_vars}"
  vpc_cidr     = "${var.vpc_cidr}"
}

Input parameters

• main_vars - Mapped variables defining the basic application parameters. Defined in the global variables.tf file.

• domains - Mapped variables defining all the domains. Used for defining local search domain as dhcp option.

• cloudwatch_flow_log - (optional) Name of a CloudWatch log group used to send flow logs to.

• network_vars - Mapped variables defining the basic network paramters. Defined in the global variables.tf file.

  Example:

  network_vars = {
    availability_zones = ["eu-west-1a", "eu-west-1b"]
    vpc_cidr           = ["10.250.0.0/16"]
  }

Output attributes

• Resources created with this module have the following output attributes:

  Attribute	Description
  vpc_id	ID of the VPC created
  private_subnet_ids	A list of private subnet ID's created
  private_routing_ids	A list of private routing table ID's created
  public_subnet_ids	A list of public subnet ID's created
  public_routing_ids	A list of prublic routing table ID's created
  private_ec_subnet_group	A list with private subnets available for Elasticache
  private_rds_subnet	A list with private subnets available for RDS
  private_rs_subnet	A list with private subnets available for Redshift
  natgw_public_ips	A list of EIP's attached to the NAT GW.

• Attribute usage:

  Attributes can be used as input varibles to other modules in the following format:

  ${module.network.<attribute_name>}

  Example:

  ${module.network.vpc_id}