Fourth exercise: using handlers

40.Handlers/40.Handlers.md

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+#40 - Handlers
+
+This exercise makes you use handlers to control flow execution.
+
+## Playbook creation
+Write a playbook following the given specs:
+* Run on host group `lab`
+* Install a web server (eg. `nginx` or `httpd`) on each host using the module adapted to the package manager of your hosts
+* Trigger a handler that starts the corresponding service (using appropriate module as well)
+
+## Validation
+Run the playbook and checks if the service is installed and started.
+
+There is a working playbook in `solution/solution.yml` (for an Alpine host)

40.Handlers/solution/cleanup.yml

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+- hosts: lab
+  gather_facts: false
+  tasks:
+  - include_tasks: tasks/stop_nginx.yml
+  - include_tasks: tasks/uninstall_nginx.yml
+
+# vim: set ft=yaml sw=2 et:

40.Handlers/solution/solution.yml

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+- hosts: lab
+  gather_facts: false
+  tasks:
+  - include_tasks: tasks/install_nginx.yml
+  handlers:
+  - import_tasks: tasks/restart_nginx.yml
+
+# vim: set ft=yaml sw=2 et:

40.Handlers/solution/tasks/install_nginx.yml

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+- name: Ensure nginx is installed
+  become: true
+  apk:
+    name: nginx
+    state: present
+  notify: Restart Nginx
+# vim: set ft=yaml sw=2 et:

40.Handlers/solution/tasks/restart_nginx.yml

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+- name: Restart Nginx
+  become: true
+  sysvinit:
+    name: nginx
+    state: started
+# vim: set ft=yaml sw=2 et:

40.Handlers/solution/tasks/stop_nginx.yml

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+- name: Stop Nginx
+  become: true
+  sysvinit:
+    name: nginx
+    state: stopped
+# vim: set ft=yaml sw=2 et:

40.Handlers/solution/tasks/uninstall_nginx.yml

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+- name: Ensure nginx is uninstalled
+  become: true
+  apk:
+    name: nginx
+    state: absent
+# vim: set ft=yaml sw=2 et: