create roles/demolamp/tasks/main.yml

main.yml

@@ -0,0 +1,6 @@
+---
+- name: main task
+  hosts: "{{ inputHostsGroups }}"
+  gather_facts: false
+  roles:
+    - role: demolamp

roles/demolamp/tasks/main.yml

@@ -0,0 +1,7 @@
+---
+- name: show remote host
+  debug:
+    msg: "the remote server is {{ ansible_host }}"
+- name: show vars of this playbook
+  debug:
+    msg: "{{ greeting }}"

roles/demolamp/vars/main.yml

@@ -0,0 +1 @@
+greeting: "hello ansible-playbook"