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examples/006_notify_handlers/webserver.yml

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+---
+- hosts: webserver
+  become: true
+  tasks:
+    - name: install web components
+      apt: name={{item}} state=present update_cache=yes
+      with_items:
+        - apache2
+        - libapache2-mod-wsgi-py3
+        - python-pip-whl
+        - python3-virtualenv
+
+    - name: ensure apache2 started
+      service: name=apache2 state=started enabled=yes
+
+    - name: ensure mod_wsgi enabled
+      apache2_module: state=present name=wsgi
+      notify: restart apache2
+
+  handlers:
+    - name: restart apache2
+      service: name=apache2 state=restarted