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Terraform Network Module

This modules makes it easy to set up a new VPC Network in GCP by defining your network and subnet ranges in a concise syntax.

It supports creating:

  • A Google Virtual Private Network (VPC)
  • Subnets within the VPC
  • Secondary ranges for the subnets (if applicable)

Compatibility

This module is meant for use with Terraform 0.12. If you haven't upgraded and need a Terraform 0.11.x-compatible version of this module, the last released version intended for Terraform 0.11.x is 0.8.0.

Usage

You can go to the examples folder, however the usage of the module could be like this in your own main.tf file:

module "vpc" {
    source  = "terraform-google-modules/network/google"
    version = "~> 1.0.0"

    project_id   = "<PROJECT ID>"
    network_name = "example-vpc"
    routing_mode = "GLOBAL"

    subnets = [
        {
            subnet_name           = "subnet-01"
            subnet_ip             = "10.10.10.0/24"
            subnet_region         = "us-west1"
        },
        {
            subnet_name           = "subnet-02"
            subnet_ip             = "10.10.20.0/24"
            subnet_region         = "us-west1"
            subnet_private_access = "true"
            subnet_flow_logs      = "true"
            description           = "This subnet has a description"
        },
    ]

    secondary_ranges = {
        subnet-01 = [
            {
                range_name    = "subnet-01-secondary-01"
                ip_cidr_range = "192.168.64.0/24"
            },
        ]

        subnet-02 = []
    }

    routes = [
        {
            name                   = "egress-internet"
            description            = "route through IGW to access internet"
            destination_range      = "0.0.0.0/0"
            tags                   = "egress-inet"
            next_hop_internet      = "true"
        },
        {
            name                   = "app-proxy"
            description            = "route through proxy to reach app"
            destination_range      = "10.50.10.0/24"
            tags                   = "app-proxy"
            next_hop_instance      = "app-proxy-instance"
            next_hop_instance_zone = "us-west1-a"
        },
    ]
}

Then perform the following commands on the root folder:

  • terraform init to get the plugins
  • terraform plan to see the infrastructure plan
  • terraform apply to apply the infrastructure build
  • terraform destroy to destroy the built infrastructure

Inputs

Name Description Type Default Required
auto_create_subnetworks When set to true, the network is created in 'auto subnet mode' and it will create a subnet for each region automatically across the 10.128.0.0/9 address range. When set to false, the network is created in 'custom subnet mode' so the user can explicitly connect subnetwork resources. bool "false" no
create_network Specify whether to create a new network or just assume it already exists. bool "true" no
delete_default_internet_gateway_routes If set, ensure that all routes within the network specified whose names begin with 'default-route' and with a next hop of 'default-internet-gateway' are deleted string "false" no
description An optional description of this resource. The resource must be recreated to modify this field. string "" no
network_name The name of the network being created string n/a yes
project_id The ID of the project where this VPC will be created string n/a yes
routes List of routes being created in this VPC list(map(string)) <list> no
routing_mode The network routing mode (default 'GLOBAL') string "GLOBAL" no
secondary_ranges Secondary ranges that will be used in some of the subnets object <map> no
shared_vpc_host Makes this project a Shared VPC host if 'true' (default 'false') string "false" no
subnets The list of subnets being created list(map(string)) n/a yes

Outputs

Name Description
network_name The name of the VPC being created
network_self_link The URI of the VPC being created
routes The routes associated with this VPC
subnets_flow_logs Whether the subnets will have VPC flow logs enabled
subnets_ips The IPs and CIDRs of the subnets being created
subnets_names The names of the subnets being created
subnets_private_access Whether the subnets will have access to Google API's without a public IP
subnets_regions The region where the subnets will be created
subnets_secondary_ranges The secondary ranges associated with these subnets
subnets_self_links The self-links of subnets being created
svpc_host_project_id Shared VPC host project id.

Subnet Inputs

The subnets list contains maps, where each object represents a subnet. Each map has the following inputs (please see examples folder for additional references):

Name Description Type Default Required
subnet_name The name of the subnet being created string - yes
subnet_ip The IP and CIDR range of the subnet being created string - yes
subnet_region The region where the subnet will be created string - yes
subnet_private_access Whether this subnet will have private Google access enabled string "false" no
subnet_flow_logs Whether the subnet will record and send flow log data to logging string "false" no

Route Inputs

The routes list contains maps, where each object represents a route. For the next_hop_* inputs, only one is possible to be used in each route. Having two next_hop_* inputs will produce an error. Each map has the following inputs (please see examples folder for additional references):

Name Description Type Default Required
name The name of the route being created string - no
description The description of the route being created string - no
tags The network tags assigned to this route. This is a list in string format. Eg. "tag-01,tag-02" string - yes
destination_range The destination range of outgoing packets that this route applies to. Only IPv4 is supported string - yes
next_hop_internet Whether the next hop to this route will the default internet gateway. Use "true" to enable this as next hop string "false" yes
next_hop_ip Network IP address of an instance that should handle matching packets string - yes
next_hop_instance URL or name of an instance that should handle matching packets. If just name is specified "next_hop_instance_zone" is required string - yes
next_hop_instance_zone The zone of the instance specified in next_hop_instance. Only required if next_hop_instance is specified as a name string - no
next_hop_vpn_tunnel URL to a VpnTunnel that should handle matching packets string - yes
priority The priority of this route. Priority is used to break ties in cases where there is more than one matching route of equal prefix length. In the case of two routes with equal prefix length, the one with the lowest-numbered priority value wins string "1000" yes

Requirements

Installed Software

  • Terraform ~> 0.12.0
  • [Terraform Provider for GCP][terraform-provider-google] ~> 2.10.0
  • gcloud >243.0.0

Configure a Service Account

In order to execute this module you must have a Service Account with the following roles:

  • roles/compute.networkAdmin on the organization or folder

If you are going to manage a Shared VPC, you must have either:

  • roles/compute.xpnAdmin on the organization
  • roles/compute.xpnAdmin on the folder (beta)

Enable API's

In order to operate with the Service Account you must activate the following API on the project where the Service Account was created:

  • Compute Engine API - compute.googleapis.com

Contributing

Refer to the contribution guidelines for information on contributing to this module.