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Terraform Google Cloud NAT Module

This module handles opinionated Google Cloud Platform Cloud NAT creation and configuration.

NOTE: It is recommended to use the Cloud Router module instead of this module. The Cloud Router module is more flexible and can be used to manage resources in addition to NATs such as interconnects.

Compatibility

This module is meant for use with Terraform 0.13+ and tested using Terraform 1.0+. If you find incompatibilities using Terraform >=0.13, please open an issue. If you haven't upgraded and need a Terraform 0.12.x-compatible version of this module, the last released version intended for Terraform 0.12.x is v1.4.0.

Usage

There are multiple examples included in the examples folder but simple usage is as follows:

module "cloud-nat" {
  source     = "terraform-google-modules/cloud-nat/google"
  version    = "~> 5.0"
  project_id = var.project_id
  region     = var.region
  router     = google_compute_router.router.name
}

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
create_router Create router instead of using an existing one, uses 'router' variable for new resource name. bool false no
drain_nat_ips A list of URLs of the IP resources to be drained. These IPs must be valid static external IPs that have been assigned to the NAT. list(string) [] no
enable_dynamic_port_allocation Enable Dynamic Port Allocation. If minPorts is set, minPortsPerVm must be set to a power of two greater than or equal to 32. bool false no
enable_endpoint_independent_mapping Specifies if endpoint independent mapping is enabled. bool false no
icmp_idle_timeout_sec Timeout (in seconds) for ICMP connections. Defaults to 30s if not set. Changing this forces a new NAT to be created. string "30" no
log_config_enable Indicates whether or not to export logs bool false no
log_config_filter Specifies the desired filtering of logs on this NAT. Valid values are: "ERRORS_ONLY", "TRANSLATIONS_ONLY", "ALL" string "ALL" no
max_ports_per_vm Maximum number of ports allocated to a VM from this NAT. This field can only be set when enableDynamicPortAllocation is enabled.This will be ignored if enable_dynamic_port_allocation is set to false. string null no
min_ports_per_vm Minimum number of ports allocated to a VM from this NAT config. Defaults to 64 if not set. Changing this forces a new NAT to be created. string "64" no
name Defaults to 'cloud-nat-RANDOM_SUFFIX'. Changing this forces a new NAT to be created. string "" no
nat_ips List of self_links of external IPs. Changing this forces a new NAT to be created. Value of nat_ip_allocate_option is inferred based on nat_ips. If present set to MANUAL_ONLY, otherwise AUTO_ONLY. list(string) [] no
network VPN name, only if router is not passed in and is created by the module. string "" no
project_id The project ID to deploy to string n/a yes
region The region to deploy to string n/a yes
router The name of the router in which this NAT will be configured. Changing this forces a new NAT to be created. string n/a yes
router_asn Router ASN, only if router is not passed in and is created by the module. string "64514" no
router_keepalive_interval Router keepalive_interval, only if router is not passed in and is created by the module. string "20" no
rules Specifies one or more rules associated with this NAT. 
list(object({
    description = string
    match       = string
    rule_number = number
    action = object({
      source_nat_active_ips = list(string)
      source_nat_drain_ips  = list(string)
    })
  }))
 [] no
source_subnetwork_ip_ranges_to_nat Defaults to ALL_SUBNETWORKS_ALL_IP_RANGES. How NAT should be configured per Subnetwork. Valid values include: ALL_SUBNETWORKS_ALL_IP_RANGES, ALL_SUBNETWORKS_ALL_PRIMARY_IP_RANGES, LIST_OF_SUBNETWORKS. Changing this forces a new NAT to be created. string "ALL_SUBNETWORKS_ALL_IP_RANGES" no
subnetworks Specifies one or more subnetwork NAT configurations 
list(object({
    name                     = string,
    source_ip_ranges_to_nat  = list(string)
    secondary_ip_range_names = list(string)
  }))
 [] no
tcp_established_idle_timeout_sec Timeout (in seconds) for TCP established connections. Defaults to 1200s if not set. Changing this forces a new NAT to be created. string "1200" no
tcp_time_wait_timeout_sec Timeout (in seconds) for TCP connections that are in TIME_WAIT state. Defaults to 120s if not set. string "120" no
tcp_transitory_idle_timeout_sec Timeout (in seconds) for TCP transitory connections. Defaults to 30s if not set. Changing this forces a new NAT to be created. string "30" no
udp_idle_timeout_sec Timeout (in seconds) for UDP connections. Defaults to 30s if not set. Changing this forces a new NAT to be created. string "30" no

Outputs

Name Description
name Name of the Cloud NAT
nat_ip_allocate_option NAT IP allocation mode
region Cloud NAT region
router_name Cloud NAT router name

Requirements

Before this module can be used on a project, you must ensure that the following pre-requisites are fulfilled:

  1. Terraform and kubectl are installed on the machine where Terraform is executed.
  2. The Service Account you execute the module with has the right permissions.
  3. The APIs are active on the project you will launch the cluster in.
  4. If you are using a Shared VPC, the APIs must also be activated on the Shared VPC host project and your service account needs the proper permissions there.

Terraform plugins

Configure a Service Account

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

Enable APIs

In order to operate with the Service Account you must activate the following APIs 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.