->基础环境
Linux：ubuntu 16.04
Python ； 2.7
->修改hostname
1:$sudo hostname 2tong-slavetwo
2:$sudo vi /etc/hostname
2tong-slavetwo
3:$sudo vi /etc/hosts
127.0.0.1 localhost 2tong-slavetwo
127.0.1.1 2tong-slavetwo
->Python 环境下输出ip hostname
>>>import socket
>>>hostname = socket.gethostname()
>>>prin
