add an example of VPN HA with mutliple VPN GWs

examples/multi_external_vpn_gateways/prod.tf

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+/**
+ * Copyright 2020 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.
+ */
+
+# Creating an external VPN gateway IP for DC1
+resource "google_compute_external_vpn_gateway" "external_gateway1" {
+  provider        = google-beta
+  name            = "vpn-peering-gw1"
+  project         = var.prod_project_id
+  redundancy_type = "SINGLE_IP_INTERNALLY_REDUNDANT"
+  description     = "My VPN peering gateway1"
+
+  interface {
+    id         = 0
+    ip_address = "8.8.8.8"
+  }
+}
+
+# Creating an external VPN gateway IP for DC2
+resource "google_compute_external_vpn_gateway" "external_gateway2" {
+  provider        = google-beta
+  name            = "vpn-peering-gw2"
+  project         = var.prod_project_id
+  redundancy_type = "SINGLE_IP_INTERNALLY_REDUNDANT"
+  description     = "My VPN peering gateway2"
+
+  interface {
+    id         = 0
+    ip_address = "8.4.4.8"
+  }
+}
+
+# In order to have successful setup, you need to configure the On-Premise
+# VPN by this below tunnels configuration.
+
+module "vpn-ha-to-onprem" {
+  source     = "../../modules/vpn_ha"
+  project_id = var.prod_project_id
+  region     = var.region
+  network    = var.prod_network_self_link
+  name       = "prod-to-onprem"
+  router_asn = 64512
+
+  tunnels = {
+    # DC1 remote tunnel with specific external VPN gateway
+    remote-0 = {
+      bgp_peer = {
+        address = "169.254.1.2"
+        asn     = 64515
+      }
+      bgp_peer_options                = null
+      bgp_session_range               = "169.254.1.1/30"
+      ike_version                     = 2
+      vpn_gateway_interface           = 0
+      peer_external_gateway_self_link = google_compute_external_vpn_gateway.external_gateway1.self_link
+      peer_external_gateway_interface = 0
+      shared_secret                   = "Secret1"
+    }
+
+    # DC2 remote tunnel with specific external VPN gateway
+    remote-1 = {
+      bgp_peer = {
+        address = "169.254.2.2"
+        asn     = 64516
+      }
+      bgp_peer_options                = null
+      bgp_session_range               = "169.254.2.1/30"
+      ike_version                     = 2
+      vpn_gateway_interface           = 1
+      peer_external_gateway_self_link = google_compute_external_vpn_gateway.external_gateway2.self_link
+      peer_external_gateway_interface = 0
+      shared_secret                   = "Secret2"
+    }
+  }
+}

examples/multi_external_vpn_gateways/variables.tf

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+/**
+ * Copyright 2020 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.
+ */
+
+variable "prod_project_id" {
+  description = "Production Project ID."
+  type        = string
+}
+
+variable "prod_network_self_link" {
+  description = "Production Network Self Link."
+  type        = string
+}
+
+variable "region" {
+  description = "Region."
+  type        = string
+  default     = "europe-west4"
+}

examples/multi_external_vpn_gateways/versions.tf

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+/**
+ * Copyright 2020 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.
+ */
+
+terraform {
+  required_version = ">= 1.3"
+}