old_contents: MARIADB = {
  	'host': "172.17.42.1",
  	'port': "3306",
  	'username': "autoscaling",
  	'password': "autoscaling@123",
  	'dbname': "autoscaling"
  }
new_contents: MARIADB = {
  	'host': "172.17.0.1",
  	'port': "3306",
  	'username': "autoscaling",
  	'password': "autoscaling@123",
  	'dbname': "autoscaling"
  }
subject: fix ip docker0 for docker 1.9