kvm-host: Add firewall rule for DRBD

kvm-host/defaults/main.yml

@@ -3,4 +3,6 @@ kvm_custom_libvirt_images_path: ''
 kvm_install_drbd: True
 kvm_scripts_dir: /usr/local/sbin
 
-kvm_pair: null
+kvm_pair: null
+
+kvm_drbd_interface: null

kvm-host/tasks/firewall.yml

@@ -0,0 +1,9 @@
+---
+- name: Allow all traffic through DRBD interface
+  ansible.builtin.lineinfile:
+    path: /etc/minifirewall.d/drbd
+    line: "/sbin/iptables -I INPUT -p tcp -i {{ kvm_drbd_interface }} -j ACCEPT"
+    create: yes
+  when:
+    - kvm_drbd_interface is defined
+    - kvm_drbd_interface | length > 0

kvm-host/tasks/main.yml

@@ -14,3 +14,5 @@
 - ansible.builtin.include: images.yml
 
 - ansible.builtin.include: tools.yml
+
+- ansible.builtin.include: firewall.yml