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examples/023_selective_removal/roles/nginx/tasks/main.yml

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+---
+- name: install tools
+  apt: name={{item}} state=present update_cache=yes
+  with_items:
+    - python-httplib2
+
+- name: install nginx
+  apt: name=nginx state=present update_cache=yes
+
+- name: configure nginx sites
+  template: src=nginx.conf.j2 dest=/etc/nginx/sites-available/{{ item.key }} mode=0644
+  with_dict: "{{ sites }}"
+  notify: restart nginx
+
+- name: get active sites
+  shell: ls /etc/nginx/sites-enabled
+  register: result
+
+- name: de-activate sites
+  file: path=/etc/nginx/sites-enabled/{{ item }} state=absent
+  with_items: "{{ result.stdout_lines }}"
+  when: item not in sites
+  notify: restart nginx
+
+- name: activate nginx sites
+  file: src=/etc/nginx/sites-available/{{ item.key }} dest=/etc/nginx/sites-enabled/{{ item.key }} state=link
+  with_dict: "{{ sites }}"
+  notify: restart nginx
+
+- name: ensure nginx started
+  service: name=nginx state=started enabled=yes