modules/workerpool-gke-ha-vpn/main.tf

/**
 * Copyright 2022 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

# HA VPN
module "vpn_ha_1" {
  source     = "terraform-google-modules/vpn/google//modules/vpn_ha"
  version    = "~> 2.3.0, != 2.3.2"
  project_id = var.project_id
  labels     = var.labels
  region     = var.location
  network    = var.workerpool_network
  name       = "${var.vpn_router_name_prefix}cloudbuild-to-${var.gke_network}"
  router_asn = var.gateway_1_asn
  router_advertise_config = {
    ip_ranges = {
      (var.workerpool_range) = "Cloud Build Private Pool"
    }
    mode   = "CUSTOM"
    groups = ["ALL_SUBNETS"]
  }
  peer_gcp_gateway = module.vpn_ha_2.self_link
  tunnels = {
    remote-0 = {
      bgp_peer = {
        address = cidrhost(var.bgp_range_1, 2) # 169.254.1.2
        asn     = var.gateway_2_asn
      }
      bgp_peer_options                = null
      bgp_session_range               = "${cidrhost(var.bgp_range_1, 1)}/30" # 169.254.1.1/30
      ike_version                     = 2
      vpn_gateway_interface           = 0
      peer_external_gateway_interface = null
      shared_secret                   = ""
    }
    remote-1 = {
      bgp_peer = {
        address = cidrhost(var.bgp_range_2, 2) #"169.254.2.2"
        asn     = var.gateway_2_asn
      }
      bgp_peer_options                = null
      bgp_session_range               = "${cidrhost(var.bgp_range_2, 1)}/30" # 169.254.2.1/30
      ike_version                     = 2
      vpn_gateway_interface           = 1
      peer_external_gateway_interface = null
      shared_secret                   = ""
    }
  }
}

module "vpn_ha_2" {
  source     = "terraform-google-modules/vpn/google//modules/vpn_ha"
  version    = "~> 2.3.0, != 2.3.2"
  project_id = var.gke_project
  labels     = var.labels
  region     = var.gke_location
  network    = var.gke_network
  name       = "${var.vpn_router_name_prefix}${var.gke_network}-to-cloudbuild"
  router_asn = var.gateway_2_asn
  router_advertise_config = {
    ip_ranges = var.gke_control_plane_cidrs
    mode      = "CUSTOM"
    groups    = ["ALL_SUBNETS"]
  }
  peer_gcp_gateway = module.vpn_ha_1.self_link
  tunnels = {
    remote-0 = {
      bgp_peer = {
        address = cidrhost(var.bgp_range_1, 1) # 169.254.1.1
        asn     = var.gateway_1_asn
      }
      bgp_peer_options                = null
      bgp_session_range               = "${cidrhost(var.bgp_range_1, 2)}/30" # 169.254.1.2/30
      ike_version                     = 2
      vpn_gateway_interface           = 0
      peer_external_gateway_interface = null
      shared_secret                   = module.vpn_ha_1.random_secret
    }
    remote-1 = {
      bgp_peer = {
        address = cidrhost(var.bgp_range_2, 1) # 169.254.2.1
        asn     = var.gateway_1_asn
      }
      bgp_peer_options                = null
      bgp_session_range               = "${cidrhost(var.bgp_range_2, 2)}/30" # 169.254.2.2/30
      ike_version                     = 2
      vpn_gateway_interface           = 1
      peer_external_gateway_interface = null
      shared_secret                   = module.vpn_ha_1.random_secret
    }
  }
}