Resolving conflicts

README.md

@@ -71,6 +71,7 @@ zm_repo:
         8: ...
         9: ...
 ```
+* **disable_existing_dns_stub_listener:** Inform "y" to disable the systemd-resolved DNS stub listener and free up port 53. Default: **n**
 
 Service Variables - Inform "y" or "n"
 --------------

defaults/main.yml

@@ -62,3 +62,4 @@ zm_repo:
         6: zcs-8.8.15_GA_3869.RHEL6_64.20190918004220
         7: zcs-8.8.15_GA_3869.RHEL7_64.20190918004220
         8: zcs-8.8.15_GA_3953.RHEL8_64.20200629025823
+disable_existing_dns_stub_listener: n

tasks/configure/disable_existing_dns_stub_listener.yml

@@ -0,0 +1,28 @@
+---
+
+- name: Disable local resolver
+  ansible.builtin.ini_file:
+    path: /etc/systemd/resolved.conf
+    section: Resolve
+    option: DNSStubListener
+    value: "no"
+  register: disable_dns_stub_listener
+
+- name: Delete symbolic link
+  file:
+    path: /etc/resolv.conf
+    state: absent
+  when: disable_dns_stub_listener.changed
+
+- name: Create symbolic link
+  file:
+    path: /etc/resolv.conf
+    src: /run/systemd/resolve/resolv.conf
+    state: link
+  when: disable_dns_stub_listener.changed
+
+- name: Restart systemd-resolved service
+  ansible.builtin.service:
+    name: systemd-resolved
+    state: restarted
+  when: disable_dns_stub_listener.changed

tasks/main.yml

@@ -26,6 +26,8 @@
   when: zimbra_store == 'y'
 - import_tasks: 'configure/mta.yml'
   when: zimbra_mta == 'y'
+- import_tasks: 'configure/disable_existing_dns_stub_listener.yml'
+  when: zimbra_dnscache == 'y' and disable_existing_dns_stub_listener == 'y'
 
 #
 # Extras configuration process