#!/usr/bin/env python
#coding:utf-8
import paramiko
hostname = ''
username = ''
password = ''
paramiko.util.log_to_file('syslogin.log') # 發送paramiko日誌到syslogin.log文件
ssh = paramiko.SSHClient() # 創建一個ssh客戶端client對象
ssh.load_system_host_keys() # 獲取客戶端host_keys,默認~/.ssh/know_hosts,非默認路徑需指定
ssh.connect(hostname = hostname, username = username, password = password)
stdin, stdout, stderr = ssh.exec_command('free -m')
print stdout.read()
ssh.close()