Farmer > API Overview > Resources > Virtual Network

Virtual Network

Overview

The virtual network builder is used to deploy virtual networks and their subnets.

Virtual Network (Microsoft.Network/virtualNetworks)
Subnets (Microsoft.Network/virtualNetworks/subnets)

The Virtual Network module contains four builders

The vnet builder is used to create Azure Virtual Network instances.
The subnet builder is used within the vnet builder to define subnets.
The addressSpace builder can be used to automatically generate subnets based on the sizes of networks needed within the address space.
The subnetSpec builder is used to define the automatically generated subnets, with the primary different from the subnet builder being that you define the size for the prefix, and not the address.

Builder Keywords

Virtual Network: `vnet`

Keyword	Purpose
name	Sets the name of the virtual network.
add_address_spaces	Adds address spaces to the virtual network.
add_subnets	Adds subnets to the virtual network.
build_address_spaces	Automatically builds address spaces for subnet names and sizes.
add_tags	Adds a set of tags to the resource
add_tag	Adds a tag to the resource
add_peer	Adds VNet peering between this and another VNet (one/two-way)
add_peers	Adds VNet peering between this and other VNets (one/two-way)

Subnet: `subnet`

Keyword	Purpose
name	Name of the subnet resource
prefix	Subnet prefix in CIDR notation (e.g. 192.168.100.0/24)
nat_gateway	Specify the NAT gateway for the subnet from the same deployment.
link_to_nat_gateway	Specify an existing NAT gateway for the subnet.
network_security_group	Specify the network security group from the same deployment.
link_to_network_security_group	Specify an existing network security group for this subnet.
link_to_vnet	Link a standalone subnet to a vnet in the same template.
link_to_unmanaged_vnet	Link a standalone subnet to an existing vnet that is already deployed.
add_delegations	Adds one or more delegations to this subnet.
add_service_endpoints	Adds one or more service endpoints to this subnet.
associate_service_endpoint_policies	Associates a subnet with an existing service policy.
allow_private_endpoints	Enable or disable support for private endpoints, default is `Disabled`
private_link_service_network_policies	Enable or disable support for private link service network polices, default is `Disabled`

Automatically build out an address space: `addressSpace`

Keyword	Purpose
space	When using `build_address_space` this specifies the address space.
subnets	Specifies the subnets to build automatically.

Specify subnets in automatic address space: `subnetSpec`

Keyword	Purpose
name	Specifies the name of the subnet to build.
size	Specifies the size of the subnet to build, default is /24.
nat_gateway	Specify the NAT gateway for the subnet from the same deployment.
link_to_nat_gateway	Specify an existing NAT gateway for the subnet.
network_security_group	Specify the network security group from the same deployment.
link_to_network_security_group	Specify an existing network security group for the subnet.
add_delegations	Adds service delegations for the subnet.
add_service_endpoints	Adds service endpoints for the subnet.
add_service_endpoint_policies	Associates the service endpoint policies with the subnet.
allow_private_endpoints	Enable or disable support for private endpoints, default is `Disabled`
private_link_service_network_policies	Enable or disable support for private link service network polices, default is `Disabled`

Configuration Members

Member	Purpose
SubnetIds	Gets a map of subnet ResourceIds by subnet name

Example - Manual Subnets

A virtual network is defined with the vnet builder. Address spaces and subnets should be added, taking care to ensure the subnets are contained within an address space on the virtual network.

open Farmer
open Farmer.Builders

let myVnet = vnet {
    name "my-vnet"
    add_address_spaces [ "192.168.200.0/22" ]
    add_subnets [
        subnet {
            name "vms"
            prefix "192.168.200.0/24"
        }
        subnet {
            name "containers"
            prefix "192.168.201.0/24"
            add_delegations [
                SubnetDelegationService.ContainerGroups
            ]
            add_service_endpoints [
                EndpointServiceType.Storage, [Location.NorthEurope; Location.WestEurope]
            ]
        }
        subnet {
            name "databases"
            prefix "192.168.202.0/24"
            add_delegations [
                SubnetDelegationService.SqlManagedInstances
            ]
        }
    ]
}

let deployment = arm {
    location Location.NorthEurope
    add_resource myVnet
}

Example - Automatically Build Subnets

Address spaces and subnets can be built out automatically to ensure the subnets are contained within the address spaces. This reduces the need for “IP math” to determine the start addresses for contiguous networks of different sizes.

open Farmer
open Farmer.Builders

let myVnet = vnet {
    name "my-vnet"
    build_address_spaces [
        addressSpace {
            space "10.28.0.0/16"
            subnets [
                subnetSpec {
                    name "vms"
                    size 26
                }
                subnetSpec {
                    name "services"
                    size 24
                }
                subnetSpec {
                    name "corporate-west"
                    size 18
                }
                subnetSpec {
                    name "corporate-east"
                    size 18
                }
                subnetSpec {
                    name "corporate-east"
                    size 18
                }
                subnetSpec {
                    name "GatewaySubnet"
                    size 28
                }
                subnetSpec {
                    name "containers"
                    size 27
                    add_delegations [SubnetDelegationService.ContainerGroups]
                    add_service_endpoints [
                        EndpointServiceType.Storage, [
                            Location.NorthEurope
                            Location.WestEurope
                        ]
                    ]
                }
            ]
        }
        addressSpace {
            space "10.30.0.0/16"
            subnets [
                subnetSpec {
                    name "remote-office"
                    size 23
                }
                subnetSpec {
                    name "applications"
                    size 24
                    add_service_endpoints [
                        EndpointServiceType.Storage, [
                            Location.NorthEurope
                            Location.WestEurope
                        ]
                    ]
                }
                subnetSpec {
                    name "reserved"
                    size 24
                }
                subnetSpec {
                    name "GatewaySubnet"
                    size 28
                }
            ]
        }
    ]
}

let deployment = arm {
    location Location.NorthEurope
    add_resource myVnet
}