Adding nginx role

* New role for nginx, main.yml will install the nginx package
* By default create the basic version nginx config
* Add variables for nginx package version and template in group_vars/all
* Refresh apt-cache in common role

playbooks/edxapp_stage.yml

@@ -6,4 +6,5 @@
     - "vars/secure/edxapp_stage_users.yml"
   roles:
     - common
+    - nginx
     - lms

playbooks/group_vars/all

+---
+nginx_cfg:
+  version_html: /opt/wwc/versions.html
+  version_json: /opt/wwc/versions.json
+
+pkgs:
+  nginx:
+    state: installed

playbooks/roles/common/tasks/main.yml

@@ -2,7 +2,10 @@
 - include: create_users.yml
 - name: Create application root
   sudo: True
-  action: file path=/opt/wwc state=directory owner=root group=root
+  file: path=/opt/wwc state=directory owner=root group=root
 - name: Create log directory
   sudo: True
-  action: file path=/mnt/logs state=directory
+  file: path=/mnt/logs state=directory
+- name: Update apt cache
+  sudo: True
+  apt: update_cache=yes

playbooks/roles/lms/tasks/main.yml

 ---
 - name: create lms application config
-  action: template src=env.json.j2 dest=/opt/wwc/lms-env.json
+  template: src=env.json.j2 dest=/opt/wwc/lms-env.json
   sudo: True
 - name: create lms auth file
-  action: template src=auth.json.j2 dest=/opt/wwc/lms-auth.json
+  template: src=auth.json.j2 dest=/opt/wwc/lms-auth.json
   sudo: True

playbooks/roles/nginx/README.md

+* main.yml:  installs nginx and will enable the basic nginx configuration for version introspection

playbooks/roles/nginx/tasks/main.yml

+---
+- name: Install nginx
+  sudo: True
+  apt: pkg=nginx state={{ pkgs.nginx.state }}
+- include: nginx_site.yml state=link site_name=edx-release
+

playbooks/roles/nginx/tasks/nginx_site.yml

+# Requires nginx package
+---
+- name: Copying nginx config
+  sudo: True
+  template: src={{ site_name }}.j2 dest=/etc/nginx/sites-available/{{ site_name }}
+
+- name: Creating nginx config link
+  sudo: True
+  file: src=/etc/nginx/sites-available/{{ site_name }} dest=/etc/nginx/sites-enabled/{{ site_name }} state={{ state }} owner=root group=root

playbooks/roles/nginx/templates/edx-release.j2

+server {
+    listen 8099 default_server;
+
+    server_name mitx_release.*;
+
+    location = /versions.html {
+        alias {{ nginx_cfg.version_html }};
+    }
+
+    location = /versions.json {
+        alias {{ nginx_cfg.version_json }};
+    }
+}
+