Server instrumentation with Upstart, Gunicorn, Django

upstart.conf

start on runlevel [2345]
stop on runlevel [06]
respawn
respawn limit 10 5

script
  NAME=app_name
  PORT=8002
  NUM_WORKERS=3
  TIMEOUT=120
  USER=john
  GROUP=john
  LOGFILE=/var/log/gunicorn/$NAME.log
  LOGDIR=$(dirname $LOGFILE)
  test -d $LOGDIR || mkdir -p $LOGDIR
  cd /home/john/app
  exec /home/john/app/env/bin/gunicorn \
  --env DJANGO_SETTINGS_MODULE=$NAME.settings \
  $NAME.wsgi:application \
  -w $NUM_WORKERS -t $TIMEOUT \
  --user=$USER --group=$GROUP --log-level=debug \
  --name=$NAME -b 127.0.0.1:$PORT
  --log-file=$LOGFILE 2>>$LOGFILE
end script