diff --git a/dhall/Host.dhall b/dhall/Host.dhall
new file mode 100644
index 0000000..8480241
--- /dev/null
+++ b/dhall/Host.dhall
@@ -0,0 +1,17 @@
+let ip = ./ip.dhall
+
+let Address = < ip : ip.Address | dhcp >
+
+let local =
+      \(suffix : Natural) ->
+        Address.ip (ip.address "192.168.1.${Natural/show suffix}" 24)
+
+let Host
+    : Type
+    = { name : Text, address : Address }
+
+let host
+    : Text -> Address -> Host
+    = \(name : Text) -> \(address : Address) -> { name, address }
+
+in {Host, Address, host, local}
diff --git a/dhall/Network.dhall b/dhall/Network.dhall
new file mode 100644
index 0000000..6ff7f5b
--- /dev/null
+++ b/dhall/Network.dhall
@@ -0,0 +1,6 @@
+let IP =
+      { Type = { address : Text, prefixLength : Natural }
+      , default.prefixLength = 24
+      }
+
+in  { Network }
diff --git a/dhall/Proxmox.dhall b/dhall/Proxmox.dhall
new file mode 100644
index 0000000..98cc0e2
--- /dev/null
+++ b/dhall/Proxmox.dhall
@@ -0,0 +1,17 @@
+let ProxmoxServerConfig = { id : Natural, address : Text }
+
+let Proxmox = < LXC : ProxmoxServerConfig | VM : ProxmoxServerConfig >
+
+let lxc = \(id : Natural) -> \(address : Text) -> Proxmox.LXC { id, address }
+
+let vm = \(id : Natural) -> \(address : Text) -> Proxmox.VM { id, address }
+
+let ipAddress =
+      \(server : Proxmox) ->
+        merge
+          { LXC = \(config : ProxmoxServerConfig) -> config.address
+          , VM = \(config : ProxmoxServerConfig) -> config.address
+          }
+          server
+
+in  { LXC = Proxmox.LXC, VM = Proxmox.VM, lxc, ipAddress }
diff --git a/dhall/Server.dhall b/dhall/Server.dhall
new file mode 100644
index 0000000..2451d94
--- /dev/null
+++ b/dhall/Server.dhall
@@ -0,0 +1,18 @@
+let Simple =
+      { Type = { address : Text, hostnames : List Text }
+      , default.hostnames = [] : List Text
+      }
+
+let Proxmox = ./Proxmox.dhall
+
+let Server = < Simple : Simple | Proxmox : Proxmox >
+
+let ipAddress =
+      \(server : Server) ->
+        merge
+          { Simple = \(s : Simple) -> s.address
+          , Proxmox = \(s : Proxmox.Proxmox) -> Proxmox.ipAddress s
+          }
+          server
+
+in  { ipAddress }
diff --git a/dhall/inventory.dhall b/dhall/inventory.dhall
new file mode 100644
index 0000000..f98384f
--- /dev/null
+++ b/dhall/inventory.dhall
@@ -0,0 +1,36 @@
+let ip = ./ip.dhall
+
+let Host = ./Host.dhall
+
+let servers = ./servers.dhall
+
+let render =
+      \(host : Host.Host) ->
+        let domain = "sailmaker.fenix.lgbt"
+
+        let renderAddress =
+              \(address : Host.Address) ->
+                merge
+                  { ip = \(ip : ip.Address) -> ip.address
+                  , dhcp = "${host.name}.${domain}"
+                  }
+                  address
+
+        in  { ansible_host = renderAddress host.address }
+
+in  { servers.hosts
+      =
+      { reason = render servers.reason, nomadix = render servers.nomadix }
+    , appliances.hosts.ipowerswitch = render servers.ipowerswitch
+    , virtual.hosts
+      =
+      { pihole = render servers.pihole
+      , wireguard = render servers.wireguard
+      , lldap = render servers.lldap
+      , traefik = render servers.traefik
+      , homeassistant = render servers.homeassistant
+      , mqtt = render servers.mqtt
+      , heimdall = render servers.heimdall
+      }
+    , sailmaker.children = { servers = {}, appliances = {}, virtual = {} }
+    }
diff --git a/dhall/ip.dhall b/dhall/ip.dhall
new file mode 100644
index 0000000..d182b8e
--- /dev/null
+++ b/dhall/ip.dhall
@@ -0,0 +1,11 @@
+let Address
+    : Type
+    = { address : Text, prefixLength : Natural }
+
+let address
+    : Text -> Natural -> Address
+    = \(address : Text) ->
+      \(prefixLength : Natural) ->
+        { address, prefixLength }
+
+in  { Address, address }
diff --git a/dhall/servers.dhall b/dhall/servers.dhall
new file mode 100644
index 0000000..e4c1d72
--- /dev/null
+++ b/dhall/servers.dhall
@@ -0,0 +1,22 @@
+let Proxmox = ./Proxmox.dhall
+
+let Host = ./Host.dhall
+
+let dhcp = Host.Address.dhcp
+
+let host = Host.host
+
+let local = Host.local
+
+in  { router = host "reason" (local 1)
+    , pihole = host "pihole" (local 2)
+    , nomadix = host "nomadix" (local 5)
+    , wireguard = host "wireguard" (local 6)
+    , lldap = host "lldap" (local 7)
+    , traefik = host "traefik" (local 8)
+    , homeassistant = host "home-assistant" (local 13)
+    , mqtt = host "mqtt" (local 14)
+    , ipowerswitch = host "ipowerswitch" (local 99)
+    , reason = host "reason" (local 183)
+    , heimdall = host "heimdall-dashboard" dhcp
+    }
diff --git a/dhall/services.dhall b/dhall/services.dhall
new file mode 100644
index 0000000..fc99817
--- /dev/null
+++ b/dhall/services.dhall
@@ -0,0 +1,31 @@
+let ProxmoxServer = { id : Natural }
+
+let Protocol = < HTTP | HTTPS >
+
+let Backend =
+      { Type = { protocol : Protocol, host : Text, port : Natural }
+      , default = { protocol = Protocol.HTTP, port = 80 }
+      }
+
+let Service =
+      { Type =
+          { name : Text
+          , hostname : Optional Text
+          , backends : List Backend.Type
+          }
+      , default = { hostname = None Text, backends = [] : List Backend.Type }
+      }
+
+let domain = "sailmaker.fenix.lgbt"
+
+let hostname
+    : Text -> Text
+    = \(name : Text) -> "${name}.${domain}"
+
+let services
+    : List Service.Type
+    = [ Service::{ name = "pihole", hostname = Some (hostname "pi-hole") }
+      , Service::{ name = "heimdall" }
+      ]
+
+in  services