#!/usr/bin/python
import boto.ec2
conn = boto.ec2.connect_to_region("eu-central-1", aws_access_key_id='AKIAI111111111111111', aws_secret_access_key='keyyyyy')
instance = conn.get_all_instances(instance_ids=['i-40eb8111'])
print instance[0].instances[0].start()

Create startBackEnd.py