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site-a.yml

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+---
+# ===========================================================================
+# Site A. Everything that differs between sites lives in this file.
+#
+#   ansible-playbook wg-relay.yml -e @vars/site-a.yml
+#
+# Site B's file is the mirror image: swap the two tunnel addresses, point
+# the targets at its own service, and list Site A as the peer.
+# ===========================================================================
+
+# --- which box to configure ------------------------------------------------
+# Set to the relay VM's address to configure it over SSH, or leave as
+# localhost to configure the machine you're running this on.
+relay_host: 192.168.1.10
+relay_user: admin
+
+# --- this side of the tunnel -----------------------------------------------
+wg_address: 10.99.0.1/32
+wg_listen_port: 51820
+
+# --- the other side --------------------------------------------------------
+wg_peers:
+  - name: site-b
+    public_key: "PASTE_SITE_B_PUBLIC_KEY_HERE"
+    # Omit endpoint on whichever side isn't reachable from outside; the
+    # other side dials in and keepalives hold the path open.
+    endpoint: site-b.example.com:51820
+    allowed_ips: 10.99.0.2/32
+    keepalive: 25
+
+# --- what is reachable, in each direction ----------------------------------
+relays:
+  # Site B reaching the service on Site A's LAN.
+  - name: in-site-b
+    direction: inbound
+    listen_address: 10.99.0.1        # this box's tunnel address
+    listen_port: 9000
+    target: 192.168.1.50:9000        # the one host:port Site B may reach
+    source_allow: 10.99.0.2/32       # Site B's tunnel address only
+
+  # Site A reaching the service on Site B's LAN. Local clients point at
+  # this box's LAN address and never need to know a tunnel exists.
+  - name: out-site-b
+    direction: outbound
+    listen_address: 192.168.1.10     # this box's LAN address
+    listen_port: 9001
+    target: 10.99.0.2:9000           # Site B's inbound relay
+    source_allow: 192.168.1.50/32    # the one local client allowed to use it