python通过ssh读写远程数据

1.适用场景

　　需要读取(写)多台远程机器下的一个或多个文件，如果要通过 os.system('scp ......')来完成就必须配置免密登陆，比较麻烦

2.准备工作，

　　安装依赖

　　pip install ssh2,

　　如未安装pip可以通过网页下载ssh2.zip文件然后通过动态加载

import os

import imp

os.system('unzip ssh2.zip')

imp.load_package('ssh2','./ssh2')

3.具体操作方式，

　　

import socket

from odps import ODPS

from ssh2.session import Session

from datetime import date, timedelta, datetime

from ssh2.sftp import LIBSSH2_FXF_READ, LIBSSH2_SFTP_S_IRUSR

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

sock.connect((host, 22))

session = Session()

session.handshake(sock)

session.userauth_password(user, pwd)

sftp = session.sftp_init()

channel = session.open_session()

channel.execute("cat demo'")

channel.wait_eof()

channel.close()

channel.wait_closed()

size, data = channel.read()

files_str = unicode(data, 'utf-8')

while size > 0:

        size, data = channel.read()

        files_str = files_str + unicode(data, 'utf-8')

print files_str