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examples/011_lineinfile/playbook/stack_restart.yml

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+---
+# Bring stack down
+- hosts: loadbalancer
+  become: true
+  tasks:
+    - service: name=nginx state=stopped
+
+- hosts: webserver
+  become: true
+  tasks:
+    - service: name=apache2 state=stopped
+
+# Restart mysql
+- hosts: database
+  become: true
+  tasks:
+    - service: name=mysql state=restarted
+
+# Bring stack up
+- hosts: webserver
+  become: true
+  tasks:
+    - service: name=apache2 state=started
+
+- hosts: loadbalancer
+  become: true
+  tasks:
+    - service: name=nginx state=started