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examples/021_vars/roles/demo_app/files/demo/app/demo.py

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+from flask import Flask
+from flask.ext.sqlalchemy import SQLAlchemy
+import os, socket
+
+app = Flask(__name__)
+app.config['SQLALCHEMY_DATABASE_URI'] = os.environ['DATABASE_URI']
+db = SQLAlchemy(app)
+hostname = socket.gethostname()
+
+@app.route('/')
+def index():
+  return 'Hello, from sunny %s!\n' % hostname
+
+@app.route('/db')
+def dbtest():
+  #try:
+  #    db.create_all()
+  #except Exception as e:
+  #    return e.message + '\n'
+  return 'Database Connected from %s!\n' % hostname
+
+if __name__ == '__main__':
+  app.run()

examples/021_vars/roles/demo_app/files/demo/app/demo.wsgi

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+activate_this = '/var/www/demo/.venv/bin/activate_this.py'
+#execfile(activate_this, dict(__file__=activate_this))
+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/021_vars/roles/demo_app/files/demo/app/requirements.txt

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+Flask==0.10.1
+Flask-SQLAlchemy==2.0

examples/021_vars/roles/demo_app/files/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>