diff --git a/deploy.d/plays/predeploy.yml b/deploy.d/plays/predeploy.yml
new file mode 100644
index 0000000..bbbd3a2
--- /dev/null
+++ b/deploy.d/plays/predeploy.yml
@@ -0,0 +1,19 @@
+---
+- name: Open up the Dat port
+  dokku_ports:
+    app: "{{ app }}"
+    mappings:
+      - "http:{{ dat_port }}:{{ dat_port }}"
+    state: absent
+
+- name: "Allow access to {{ dat_port }} on the firewall"
+  become: true
+  ufw:
+    rule: allow
+    port: "{{ dat_port }}"
+
+- name: "Reload the firewall to enable {{ dat_port }}"
+  become: true
+  service:
+    name: ufw
+    state: restarted