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Cloud HA VPN Module

This module makes it easy to deploy either GCP-to-GCP or GCP-to-On-prem Cloud HA VPN.

Examples

GCP to GCP

module "vpn-1" {
  source       = "./fabric/modules/net-vpn-ha"
  project_id   = var.project_id
  region       = "europe-west4"
  network      = var.vpc1.self_link
  name         = "net1-to-net-2"
  peer_gateway = { gcp = module.vpn-2.self_link }
  router_config = {
    asn = 64514
    custom_advertise = {
      all_subnets = true
      ip_ranges = {
        "10.0.0.0/8" = "default"
      }
    }
  }
  tunnels = {
    remote-0 = {
      bgp_peer = {
        address = "169.254.1.1"
        asn     = 64513
      }
      bgp_session_range     = "169.254.1.2/30"
      vpn_gateway_interface = 0
    }
    remote-1 = {
      bgp_peer = {
        address = "169.254.2.1"
        asn     = 64513
      }
      bgp_session_range     = "169.254.2.2/30"
      vpn_gateway_interface = 1
    }
  }
}

module "vpn-2" {
  source        = "./fabric/modules/net-vpn-ha"
  project_id    = var.project_id
  region        = "europe-west4"
  network       = var.vpc2.self_link
  name          = "net2-to-net1"
  router_config = { asn = 64513 }
  peer_gateway  = { gcp = module.vpn-1.self_link }
  tunnels = {
    remote-0 = {
      bgp_peer = {
        address = "169.254.1.2"
        asn     = 64514
      }
      bgp_session_range     = "169.254.1.1/30"
      shared_secret         = module.vpn-1.random_secret
      vpn_gateway_interface = 0
    }
    remote-1 = {
      bgp_peer = {
        address = "169.254.2.2"
        asn     = 64514
      }
      bgp_session_range     = "169.254.2.1/30"
      shared_secret         = module.vpn-1.random_secret
      vpn_gateway_interface = 1
    }
  }
}
# tftest modules=2 resources=18

Note: When using the for_each meta-argument you might experience a Cycle Error due to the multiple net-vpn-ha modules referencing each other. To fix this you can create the google_compute_ha_vpn_gateway resources separately and reference them in the net-vpn-ha module via the vpn_gateway and peer_gcp_gateway variables.

GCP to on-prem

module "vpn_ha" {
  source     = "./fabric/modules/net-vpn-ha"
  project_id = var.project_id
  region     = var.region
  network    = var.vpc.self_link
  name       = "mynet-to-onprem"
  peer_gateway = {
    external = {
      redundancy_type = "SINGLE_IP_INTERNALLY_REDUNDANT"
      interfaces      = ["8.8.8.8"] # on-prem router ip address
    }
  }
  router_config = { asn = 64514 }
  tunnels = {
    remote-0 = {
      bgp_peer = {
        address = "169.254.1.1"
        asn     = 64513
      }
      bgp_session_range               = "169.254.1.2/30"
      peer_external_gateway_interface = 0
      shared_secret                   = "mySecret"
      vpn_gateway_interface           = 0
    }
    remote-1 = {
      bgp_peer = {
        address = "169.254.2.1"
        asn     = 64513
      }
      bgp_session_range               = "169.254.2.2/30"
      peer_external_gateway_interface = 0
      shared_secret                   = "mySecret"
      vpn_gateway_interface           = 1
    }
  }
}
# tftest modules=1 resources=10

Variables

name	description	type	required	default
name	VPN Gateway name (if an existing VPN Gateway is not used), and prefix used for dependent resources.	`string`	✓
network	VPC used for the gateway and routes.	`string`	✓
peer_gateway	Configuration of the (external or GCP) peer gateway.	`object({…})`	✓
project_id	Project where resources will be created.	`string`	✓
region	Region used for resources.	`string`	✓
router_config	Cloud Router configuration for the VPN. If you want to reuse an existing router, set create to false and use name to specify the desired router.	`object({…})`	✓
tunnels	VPN tunnel configurations.	`map(object({…}))`		`{}`
vpn_gateway	HA VPN Gateway Self Link for using an existing HA VPN Gateway. Ignored if `vpn_gateway_create` is set to `true`.	`string`		`null`
vpn_gateway_create	Create HA VPN Gateway.	`bool`		`true`

Outputs

name	description	sensitive
bgp_peers	BGP peer resources.
external_gateway	External VPN gateway resource.
gateway	VPN gateway resource (only if auto-created).
name	VPN gateway name (only if auto-created). .
random_secret	Generated secret.
router	Router resource (only if auto-created).
router_name	Router name.
self_link	HA VPN gateway self link.
tunnel_names	VPN tunnel names.
tunnel_self_links	VPN tunnel self links.
tunnels	VPN tunnel resources.

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