Added all files

examples/012_mysql_management/control.yml

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+---
+- hosts: control
+  become: true
+  tasks:
+    - name: install tools
+      apt: name={{item}} state=present update_cache=yes
+      with_items:
+        - curl

examples/012_mysql_management/database.yml

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+---
+- hosts: database
+  become: true
+  tasks:
+    - name: install tools
+      apt: name={{item}} state=present update_cache=yes
+      with_items:
+        - python3-mysqldb
+        - mysql-server
+
+    - name: ensure mysql started
+      service: name=mysql state=started enabled=yes
+
+    - name: ensure mysql listening on all ports
+      lineinfile: dest=/etc/mysql/my.cnf regexp=^bind-address line="bind-address = 0.0.0.0"
+
+    - name: create demo database
+      mysql_db: name=demo state=present
+
+    - name: create demo user
+      mysql_user: name=demo password=demo priv=demo.*:ALL host='%' state=present

examples/012_mysql_management/demo/app/demo.py

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+from flask import Flask
+from flask_sqlalchemy import SQLAlchemy
+import os, socket
+
+app = Flask(__name__)
+app.config['SQLALCHEMY_DATABASE_URI'] = os.environ['DATABASE_URI']
+app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
+db = SQLAlchemy(app)
+hostname = socket.gethostname()
+
+@app.route('/')
+def index():
+  return 'Hello, from sunny %s!\n' % hostname
+
+@app.route('/db')
+def dbtest():
+  return 'Database Connected from %s!\n' % hostname
+
+if __name__ == '__main__':
+  app.run()

examples/012_mysql_management/demo/app/demo.wsgi

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+activate_this = '/var/www/demo/.venv/bin/activate_this.py'
+exec(open(activate_this).read(), {'__file__': activate_this})
+
+import os
+os.environ['DATABASE_URI'] = 'mysql://demo:demo@db01/demo'
+
+import sys
+sys.path.insert(0, '/var/www/demo')
+
+from demo import app as application

examples/012_mysql_management/demo/app/requirements.txt

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+click==7.1.2
+Flask==1.1.4
+Flask-SQLAlchemy==2.5.1
+greenlet==1.1.2
+itsdangerous==1.1.0
+Jinja2==2.11.3
+MarkupSafe==2.0.1
+SQLAlchemy==1.4.32
+Werkzeug==1.0.1

examples/012_mysql_management/demo/demo.conf

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+<VirtualHost *>
+    WSGIDaemonProcess demo threads=5
+    WSGIScriptAlias / /var/www/demo/demo.wsgi
+
+    <Directory /var/www/demo>
+        WSGIProcessGroup demo
+        WSGIApplicationGroup %{GLOBAL}
+        Order deny,allow
+        Allow from all
+    </Directory>
+</VirtualHost>

examples/012_mysql_management/loadbalancer.yml

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+---
+- hosts: loadbalancer
+  become: true
+  tasks:
+    - name: install nginx
+      apt: name=nginx state=present update_cache=yes
+
+    - name: ensure nginx started
+      service: name=nginx state=started enabled=yes
+
+    - name: configure nginx site
+      template: src=templates/nginx.conf.j2 dest=/etc/nginx/sites-available/demo mode=0644
+      notify: restart nginx
+
+    - name: de-activate default nginx site
+      file: path=/etc/nginx/sites-enabled/default state=absent
+      notify: restart nginx
+
+    - name: activate demo nginx site
+      file: src=/etc/nginx/sites-available/demo dest=/etc/nginx/sites-enabled/demo state=link
+      notify: restart nginx
+
+  handlers:
+    - name: restart nginx
+      service: name=nginx state=restarted

examples/012_mysql_management/playbook/clean-database.yml

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+---
+- hosts: database
+  become: true
+  tasks:
+    - name: create demo database
+      mysql_db: name=demo state=absent
+
+    - name: create demo user
+      mysql_user: name=demo password=demo priv=demo.*:ALL host='%' state=absent

examples/012_mysql_management/playbook/hostname.yml

@@ -0,0 +1,5 @@
+---
+  - hosts: all
+    tasks:
+      - name: get server hostname
+        command: hostname

examples/012_mysql_management/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 - commented problem with the VMs
+- 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

examples/012_mysql_management/templates/nginx.conf.j2

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+upstream demo {
+{% for server in groups.webserver %}
+    server {{ server }};
+{% endfor %}
+}
+
+server {
+    listen 80;
+
+    location / {
+        proxy_pass http://demo;
+    }
+}

examples/012_mysql_management/webserver.yml

@@ -0,0 +1,42 @@
+---
+- 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
+
+    - name: copy demo app source
+      copy: src=demo/app/ dest=/var/www/demo mode=0755
+      notify: restart apache2
+
+    - name: copy apache virtual host config
+      copy: src=demo/demo.conf dest=/etc/apache2/sites-available mode=0755
+      notify: restart apache2
+
+    - name: setup python virtualenv
+      pip: requirements=/var/www/demo/requirements.txt virtualenv=/var/www/demo/.venv
+      notify: restart apache2
+
+    - name: de-activate default apache site
+      file: path=/etc/apache2/sites-enabled/000-default.conf state=absent
+      notify: restart apache2
+
+    - name: activate demo apache site
+      file: src=/etc/apache2/sites-available/demo.conf dest=/etc/apache2/sites-enabled/demo.conf state=link
+      notify: restart apache2
+
+  handlers:
+    - name: restart apache2
+      service: name=apache2 state=restarted