Primi passaggi testati OK.

roles/fqdn/tasks/main.yml

@@ -2,9 +2,11 @@
 # Sistemiamo un po' di impostazioni legate al dominio
 
 - name: Impostazione del dominio
-  ansible.builtin.file:
+  ansible.builtin.lineinfile:
     path: /etc/domainname
-    content: |
+    state: present
+    create: true
+    line: |-
       {{ domain }}
     owner: root
     group: root
@@ -19,4 +21,4 @@
 - name: Verifichiamo che tutto sia in ordine
   ansible.builtin.command: hostname -f
   register: returned_fqdn
-  failed_when: returned_fqdn.stdout != "{{ ansible_hostname }}.{{ domain }}"
+  failed_when: returned_fqdn.stdout|trim !=  ansible_hostname + '.' + domain