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foundation_cloud_nat.tf
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foundation_cloud_nat.tf
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## Useful Links
// Terraform - https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/compute_router_nat
// GCLOUD - https://cloud.google.com/sdk/gcloud/reference/compute/routers/nats/create
locals {
defaults_cloud_nat = {
min_ports_per_vm = 64
udp_idle_timeout = 30
icmp_idle_timeout = 30
tcp_established_idle_timeout = 120
tcp_transitory_idle_timeout = 30
endpoint_independent_mapping = "DISABLED"
log_config = "DISABLED"
source_subnetwork_ip_ranges_to_nat = "DISABLED"
subnetworks = {
source_ip_ranges_to_nat = "DISABLED"
}
}
lookups_endpoint_independent_mapping = {
"DISABLED" = false
"ENABLED" = true
}
lookups_source_subnetwork_ip_ranges_to_nat = {
"DISABLED" = "DISABLED"
"ALL_PRIMARY_SUBNETWORKS" = "ALL_SUBNETWORKS_ALL_PRIMARY_IP_RANGES"
"ALL_PRIMARY_SUBNETWORKS_ALL_SECONDARY_SUBNETWORKS" = "ALL_SUBNETWORKS_ALL_IP_RANGES"
"SELECTED_PRIMARY_SUBNETWORKS_SELECTED_SECONDARY_SUBNETWORKS" = "LIST_OF_SUBNETWORKS"
}
lookups_source_ip_ranges_to_nat = {
"DISABLED" = ["DISABLED"]
"ALL_SUBNETWORKS" = ["ALL_IP_RANGES"]
"ALL_SECONDARY_SUBNETWORKS" = ["LIST_OF_SECONDARY_IP_RANGES"]
"PRIMARY_SUBNETWORK" = ["PRIMARY_IP_RANGE"]
"PRIMARY_SUBNETWORK_SELECTED_SECONDARY_SUBNETWORKS" = ["PRIMARY_IP_RANGE", "LIST_OF_SECONDARY_IP_RANGES"]
"SELECTED_SECONDARY_SUBNETWORKS" = ["LIST_OF_SECONDARY_IP_RANGES"]
}
cloud_nat_groups = merge(distinct(flatten([
for network in var.network_configs : {
for nat_group in network.cloud_nat.nat_groups : "${var.prefix}-${var.environment}-vpc-${network.label}__${nat_group.nat_group_id}" => {
network = templatefile("${path.module}/templates/network.tftpl", {
attributes = {
name = try(network.name, null),
label = network.label,
prefix = try(network.prefix, var.prefix, null),
environment = try(network.environment, var.environment, null)
} })
nat_group_id = nat_group.nat_group_id
log_config = try(nat_group.log_config, local.defaults_cloud_nat.log_config)
min_ports_per_vm = try(nat_group.min_ports_per_vm, local.defaults_cloud_nat.min_ports_per_vm)
udp_idle_timeout = try(nat_group.udp_idle_timeout, local.defaults_cloud_nat.udp_idle_timeout)
icmp_idle_timeout = try(nat_group.icmp_idle_timeout, local.defaults_cloud_nat.icmp_idle_timeout)
tcp_established_idle_timeout = try(nat_group.tcp_established_idle_timeout, local.defaults_cloud_nat.tcp_established_idle_timeout)
tcp_transitory_idle_timeout = try(nat_group.tcp_transitory_idle_timeout, local.defaults_cloud_nat.tcp_transitory_idle_timeout)
endpoint_independent_mapping = lookup(local.lookups_endpoint_independent_mapping, try(nat_group.endpoint_independent_mapping, local.defaults_cloud_nat.endpoint_independent_mapping))
} if can(nat_group.nat_group_id)
} if try((network.cloud_nat.subnetworks_to_nat == "SELECTED_PRIMARY_SUBNETWORKS_SELECTED_SECONDARY_SUBNETWORKS" && 0 < length(network.cloud_nat.nat_groups)), false)
]))...)
cloud_nat_networks = { for cloud_nat_network in distinct(flatten([
for network in var.network_configs : [
for primary_subnetwork in network.subnetworks : {
region = lower(primary_subnetwork.region)
region_shortname = module.gcp_utils.region_short_name_map[lower(primary_subnetwork.region)]
project_id = try(network.project_id, var.project_id)
network = templatefile("${path.module}/templates/network.tftpl", {
attributes = {
name = try(network.name, null),
label = network.label,
prefix = try(network.prefix, var.prefix, null),
environment = try(network.environment, var.environment, null)
} })
network_shortname = try(network.label, network.name)
name = templatefile("${path.module}/templates/cloud_nat.tftpl", {
attributes = {
name = null,
label = network.label,
prefix = try(network.prefix, var.prefix, null),
environment = try(network.environment, var.environment, null),
region = module.gcp_utils.region_short_name_map[lower(primary_subnetwork.region)],
} })
router = templatefile("${path.module}/templates/cloud_router.tftpl", {
attributes = {
name = null,
label = network.label,
prefix = try(network.prefix, var.prefix, null),
environment = try(network.environment, var.environment, null),
region = module.gcp_utils.region_short_name_map[lower(primary_subnetwork.region)],
purpose = "nat"
} })
source_subnetwork_ip_ranges_to_nat = try(lookup(local.lookups_source_subnetwork_ip_ranges_to_nat, network.cloud_nat.subnetworks_to_nat), local.defaults_cloud_nat.source_subnetwork_ip_ranges_to_nat)
log_config = try(network.cloud_nat.log_config, local.defaults_cloud_nat.log_config)
min_ports_per_vm = try(network.cloud_nat.min_ports_per_vm, local.defaults_cloud_nat.min_ports_per_vm)
udp_idle_timeout = try(network.cloud_nat.udp_idle_timeout, local.defaults_cloud_nat.udp_idle_timeout)
icmp_idle_timeout = try(network.cloud_nat.icmp_idle_timeout, local.defaults_cloud_nat.icmp_idle_timeout)
tcp_established_idle_timeout = try(network.cloud_nat.tcp_established_idle_timeout, local.defaults_cloud_nat.tcp_established_idle_timeout)
tcp_transitory_idle_timeout = try(network.cloud_nat.tcp_transitory_idle_timeout, local.defaults_cloud_nat.tcp_transitory_idle_timeout)
endpoint_independent_mapping = lookup(local.lookups_endpoint_independent_mapping, try(network.cloud_nat.endpoint_independent_mapping, local.defaults_cloud_nat.endpoint_independent_mapping))
} if try(contains(["ALL_PRIMARY_SUBNETWORKS", "ALL_PRIMARY_SUBNETWORKS_ALL_SECONDARY_SUBNETWORKS"], network.cloud_nat.subnetworks_to_nat), false)
] if try(contains(["ALL_PRIMARY_SUBNETWORKS", "ALL_PRIMARY_SUBNETWORKS_ALL_SECONDARY_SUBNETWORKS"], network.cloud_nat.subnetworks_to_nat), false)
])) : "${cloud_nat_network.network}__${cloud_nat_network.region_shortname}" => cloud_nat_network }
# "DISABLED" = ["DISABLED"]
# "ALL_SECONDARY_SUBNETWORKS" = ["LIST_OF_SECONDARY_IP_RANGES"]
# "SELECTED_SECONDARY_SUBNETWORKS" = ["LIST_OF_SECONDARY_IP_RANGES"]
# "ALL_SUBNETWORKS" = ["ALL_IP_RANGES"]
# "PRIMARY_SUBNETWORK" = ["PRIMARY_IP_RANGE"]
# "PRIMARY_SUBNETWORK_SELECTED_SECONDARY_SUBNETWORKS" = ["PRIMARY_IP_RANGE", "LIST_OF_SECONDARY_IP_RANGES"]
cloud_nat_primary_subnetworks = distinct(flatten([
for network in var.network_configs : [
for primary_subnetwork in network.subnetworks : {
region = lower(primary_subnetwork.region)
project_id = try(network.project_id, var.project_id)
network = templatefile("${path.module}/templates/network.tftpl", {
attributes = {
name = try(network.name, null),
label = network.label
prefix = try(network.prefix, var.prefix, null),
environment = try(network.environment, var.environment, null)
} })
network_shortname = try(network.label, network.name)
name = templatefile("${path.module}/templates/cloud_nat.tftpl", {
attributes = {
name = null,
label = network.label
prefix = try(network.prefix, var.prefix, null),
environment = try(network.environment, var.environment, null),
region = module.gcp_utils.region_short_name_map[lower(primary_subnetwork.region)],
} })
router = templatefile("${path.module}/templates/cloud_router.tftpl", {
attributes = {
name = null,
label = network.label
prefix = try(network.prefix, var.prefix, null),
environment = try(network.environment, var.environment, null),
region = module.gcp_utils.region_short_name_map[lower(primary_subnetwork.region)],
purpose = "nat"
} })
primary_subnetwork_name = templatefile("${path.module}/templates/subnetwork_primary.tftpl", {
attributes = {
name = try(primary_subnetwork.name, null),
label = network.label
prefix = try(network.prefix, var.prefix, null),
environment = try(network.environment, var.environment, null)
region = module.gcp_utils.region_short_name_map[lower(primary_subnetwork.region)],
cidr = try(primary_subnetwork.ip_cidr_range, null),
} })
nat_group_id = primary_subnetwork.cloud_nat.nat_group_id
mapping_nat_group_id = "${var.prefix}-${var.environment}-vpc-${network.label}__${primary_subnetwork.cloud_nat.nat_group_id}__${module.gcp_utils.region_short_name_map[lower(primary_subnetwork.region)]}"
source_ip_ranges_to_nat = ["PRIMARY_IP_RANGE"]
} if can(lookup(local.cloud_nat_groups, "${var.prefix}-${var.environment}-vpc-${network.label}__${primary_subnetwork.cloud_nat.nat_group_id}")) &&
try(contains(["ALL_SUBNETWORKS", "PRIMARY_SUBNETWORK", "PRIMARY_SUBNETWORK_SELECTED_SECONDARY_SUBNETWORKS"], primary_subnetwork.cloud_nat.subnetworks_to_nat), false)
] if can(network.subnetworks)
]))
cloud_nat_secondary_subnetworks = distinct(flatten([
for network in var.network_configs : [
for primary_subnetwork in network.subnetworks : [
for secondary_subnetwork in primary_subnetwork.secondary_subnetworks : {
region = lower(primary_subnetwork.region)
project_id = try(network.project_id, var.project_id)
network = templatefile("${path.module}/templates/network.tftpl", {
attributes = {
name = try(network.name, null),
label = network.label
prefix = try(network.prefix, var.prefix, null),
environment = try(network.environment, var.environment, null)
} })
network_shortname = try(network.label, network.name)
name = templatefile("${path.module}/templates/cloud_nat.tftpl", {
attributes = {
name = null,
label = network.label
prefix = try(network.prefix, var.prefix, null),
environment = try(network.environment, var.environment, null),
region = module.gcp_utils.region_short_name_map[lower(primary_subnetwork.region)],
} })
router = templatefile("${path.module}/templates/cloud_router.tftpl", {
attributes = {
name = null,
label = network.label
prefix = try(network.prefix, var.prefix, null),
environment = try(network.environment, var.environment, null),
region = module.gcp_utils.region_short_name_map[lower(primary_subnetwork.region)],
purpose = "nat"
} })
primary_subnetwork_name = templatefile("${path.module}/templates/subnetwork_primary.tftpl", {
attributes = {
name = try(primary_subnetwork.name, null),
label = network.label
prefix = try(network.prefix, var.prefix, null),
environment = try(network.environment, var.environment, null)
region = module.gcp_utils.region_short_name_map[lower(primary_subnetwork.region)],
cidr = try(primary_subnetwork.ip_cidr_range, null),
} })
secondary_subnetwork_name = templatefile("${path.module}/templates/subnetwork_secondary.tftpl", {
attributes = {
name = try(secondary_subnetwork.name, null),
label = network.label,
region = module.gcp_utils.region_short_name_map[lower(primary_subnetwork.region)],
cidr = try(secondary_subnetwork.ip_cidr_range, null)
} })
nat_group_id = secondary_subnetwork.nat_group_id
mapping_nat_group_id = "${var.prefix}-${var.environment}-vpc-${network.label}__${secondary_subnetwork.nat_group_id}__${module.gcp_utils.region_short_name_map[lower(primary_subnetwork.region)]}"
source_ip_ranges_to_nat = ["LIST_OF_SECONDARY_IP_RANGES"]
} if can(lookup(local.cloud_nat_groups, "${var.prefix}-${var.environment}-vpc-${network.label}__${secondary_subnetwork.nat_group_id}"))
] if can(primary_subnetwork.secondary_subnetworks) &&
try(contains(["SELECTED_SECONDARY_SUBNETWORKS", "PRIMARY_SUBNETWORK_SELECTED_SECONDARY_SUBNETWORKS"], primary_subnetwork.cloud_nat.subnetworks_to_nat), false)
] if can(network.subnetworks)
]))
cloud_nat_subnetworks = concat(
local.cloud_nat_primary_subnetworks,
local.cloud_nat_secondary_subnetworks,
)
mapping_nat_group_ids = distinct([for x in local.cloud_nat_subnetworks : {
mapping_nat_group_id = x.mapping_nat_group_id,
nat_group_id = x.nat_group_id
project_id = x.project_id
network_shortname = x.network_shortname
region = x.region
router = x.router
name = x.name
}])
cloud_nat_mapped_subnetwork_nat_groups = { for values in local.mapping_nat_group_ids : values.mapping_nat_group_id => merge({
net_group_id = values.nat_group_id
router = values.router
name = "${values.name}-${values.nat_group_id}"
region = values.region
project_id = values.project_id
source_subnetwork_ip_ranges_to_nat = "LIST_OF_SUBNETWORKS"
subnetworks = [for x in local.cloud_nat_subnetworks : {
name = x.primary_subnetwork_name
source_ip_ranges_to_nat = x.source_ip_ranges_to_nat
secondary_ip_range_names = try([x.secondary_subnetwork_name], [])
} if x.mapping_nat_group_id == values.mapping_nat_group_id]
}, lookup(local.cloud_nat_groups, "${var.prefix}-${var.environment}-vpc-${values.network_shortname}__${values.nat_group_id}")) }
cloud_nats = merge(local.cloud_nat_networks, local.cloud_nat_mapped_subnetwork_nat_groups)
}
# https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/compute_router
resource "google_compute_router" "cloud_nat_routers" {
for_each = { for y in distinct([for x in local.cloud_nats : { router = x.router, region = x.region, network = x.network, project_id = x.project_id }]) : y.router => y }
name = each.value.router
project = each.value.project_id
network = each.value.network
region = each.value.region
depends_on = [
google_compute_network.networks,
google_compute_subnetwork.subnetworks,
]
}
# https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/compute_router_nat
resource "google_compute_router_nat" "cloud_nats" {
for_each = local.cloud_nats
project = each.value.project_id
name = each.value.name
router = each.value.router
region = each.value.region
source_subnetwork_ip_ranges_to_nat = each.value.source_subnetwork_ip_ranges_to_nat
nat_ip_allocate_option = "AUTO_ONLY"
# Cloud NAT Options
min_ports_per_vm = each.value.min_ports_per_vm
tcp_established_idle_timeout_sec = each.value.tcp_established_idle_timeout
tcp_transitory_idle_timeout_sec = each.value.tcp_transitory_idle_timeout
icmp_idle_timeout_sec = each.value.icmp_idle_timeout
udp_idle_timeout_sec = each.value.udp_idle_timeout
enable_endpoint_independent_mapping = each.value.endpoint_independent_mapping
log_config {
enable = contains(["ALL", "ERRORS_ONLY", "TRANSLATIONS_ONLY"], each.value.log_config)
filter = contains(["ALL", "ERRORS_ONLY", "TRANSLATIONS_ONLY"], each.value.log_config) ? each.value.log_config : "ALL"
}
dynamic "subnetwork" {
for_each = try(each.value.subnetworks, [])
content {
name = "https://www.googleapis.com/compute/v1/projects/${each.value.project_id}/regions/${each.value.region}/subnetworks/${subnetwork.value.name}"
secondary_ip_range_names = subnetwork.value.secondary_ip_range_names
source_ip_ranges_to_nat = subnetwork.value.source_ip_ranges_to_nat
}
}
depends_on = [
google_compute_network.networks,
google_compute_subnetwork.subnetworks,
google_compute_router.cloud_nat_routers,
]
}