Python提供了一个Paramiko模块，允许我们通过SSH 对远程系统进行操作，上传和下载文件。他的使用很直观，下面直接看例子。
例1
#!/usr/bin/env python
# -*- coding:utf-8 -*-
# Author Yuan Li
import paramiko
# 创建SSH对象
ssh = paramiko.SSHClient()
# 允许连接不在know_hosts文件中的主机
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
# 连接服务器
ssh.connect(hostname='host', port=22, username='root', password='123')
# 执行命令
stdin, stdout, stderr = ssh.exec_command('df -hT')
# 获取命令结果
result = stdout.read()
print(result.decode())
# 关闭连接
ssh.close()
----------
"C:\Program Files\Python3\python.exe" C:/Users/yli/pycharmprojects/Exercise/Week12/paramiko_test.py
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/centos-root xfs 28G 6.5G 22G 24% /
devtmpfs devtmpfs 988M 0 988M 0% /dev
tmpfs tmpfs 998M 80K 998M 1% /dev/shm
tmpfs tmpfs 998M 112M 887M 12% /run
tmpfs tmpfs 998M 0 998M 0% /sys/fs/cgroup
/dev/sda1 xfs 497M 169M 329M 34% /boot
tmpfs tmpfs 200M 12K 200M 1% /run/user/42
tmpfs tmpfs 200M 0 200M 0% /run/user/0
如果看看ssh.connect()这个方法的源码，我们可以看见他实际上调用的是Transport这个类的方法。因此我们可以直接使用Transport来创建一个session，然后进行连接，效果和上面是一样的。
例2
import paramiko
#创建一个transport session
transport = paramiko.Transport(('sydnagios', 22))
#连接session
transport.connect(username='root', password='Goat2015')
ssh = paramiko.SSHClient()
ssh._transport = transport
#执行命令
stdin, stdout, stderr = ssh.exec_command('df')
print (stdout.read().decode())
#创建sftp的对象
sftp=paramiko.SFTPClient.from_transport(transport)
#上传
sftp.put('c:\\temp\\aaa.txt','/tmp/aaa.txt')
#下载
sftp.get('/tmp/aaa.txt','c:\\temp\\bbb.txt')
transport.close()
----------
"C:\Program Files\Python3\python.exe" C:/Users/yli/pycharmprojects/Exercise/Week12/paramiko_test.py
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/centos-root xfs 28G 6.5G 22G 24% /
devtmpfs devtmpfs 988M 0 988M 0% /dev
tmpfs tmpfs 998M 80K 998M 1% /dev/shm
tmpfs tmpfs 998M 112M 887M 12% /run
tmpfs tmpfs 998M 0 998M 0% /sys/fs/cgroup
/dev/sda1 xfs 497M 169M 329M 34% /boot
tmpfs tmpfs 200M 12K 200M 1% /run/user/42
tmpfs tmpfs 200M 0 200M 0% /run/user/0
例3，我们可以完善一下例2，把这么操作都封装到自定义的类里
import paramiko
import uuid
class SSHConnection(object):
#初始化封装字段
def __init__(self, host='sydnagios', port=22, username='root',pwd='123'):
self.host = host
self.port = port
self.username = username
self.pwd = pwd
self.__k = None
#连接session，执行操作，断开session
def run(self):
self.connect()
pass
self.close()
#连接
def connect(self):
transport = paramiko.Transport((self.host,self.port))
transport.connect(username=self.username,password=self.pwd)
self.__transport = transport
#断开
def close(self):
self.__transport.close()
#执行命令
def cmd(self, command):
ssh = paramiko.SSHClient()
ssh._transport = self.__transport
# 执行命令
stdin, stdout, stderr = ssh.exec_command(command)
# 获取命令结果
result = stdout.read()
return result
def upload(self,local_path, target_path):
# 连接，上传
sftp = paramiko.SFTPClient.from_transport(self.__transport)
# 将location.py 上传至服务器 /tmp/test.py
sftp.put(local_path, target_path)
ssh = SSHConnection()
ssh.connect()
r1 = ssh.cmd('df')
print(r1.decode())
ssh.upload('c:\\temp\\aaa.txt', "/home/yli/s7.py")
ssh.close()
----------
"C:\Program Files\Python3\python.exe" C:/s13课上代码/s13day13课上代码/s13day13_课上代码/paramiko模块_demo.py
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/centos-root 28813572 6760732 22052840 24% /
devtmpfs 1011616 0 1011616 0% /dev
tmpfs 1021272 80 1021192 1% /dev/shm
tmpfs 1021272 113928 907344 12% /run
tmpfs 1021272 0 1021272 0% /sys/fs/cgroup
/dev/sda1 508588 172604 335984 34% /boot
tmpfs 204256 12 204244 1% /run/user/42
tmpfs 204256 0 204256 0% /run/user/0