执行一个cmd后,paramiko的ssh通道关闭 - Python

Question

我正在使用Python's' Paramiko来删除服务器中的命令.代码很简单.

这是我对SSHConn班级的定义:

class SSHConn:

  def __init__(self, hostname, user, pwd, filename=None):
    self.client = paramiko.SSHClient()
    self.client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    self.client.connect(hostname, username=user, password=pwd,
                          key_filename=filename)
    self.transport = self.client.get_transport()
    self.channel = self.transport.open_session()

所以我正在运行以下代码:

local_ssh = ssh.SSHConn(host, user, passwd)

cmds = ('foo', 'bar')
for cmd in cmds:
   local_ssh.channel.exec_command(cmd)
   self.log.info(local_ssh.channel.recv(1024))

但是,当我执行以下代码时,我得到了:

INFO:paramiko.transport:Connected (version 2.0, client OpenSSH_6.6.1p1)
INFO:paramiko.transport:Authentication (publickey) failed.
INFO:paramiko.transport:Authentication (password) successful!
INFO:paramiko.transport:Secsh channel 1 opened.
INFO:testsets.testcase:
ERROR:testsets.testcase:Channel is not open
Traceback (most recent call last):
  File "/root/fds-src/source/test/integration-framework/testsets/testcases/test_100gb_volume.py", line 87, in runTest
    local_ssh.channel.exec_command(cmd)
  File "/usr/lib/python2.7/dist-packages/paramiko/channel.py", line 209, in exec_command
    raise SSHException('Channel is not open')
SSHException: Channel is not open
ERROR:testsets.testcase:Test Case Test100GBVolume failed.
Traceback (most recent call last):
  File "/root/fds-src/source/test/integration-framework/testsets/testcases/test_100gb_volume.py", line 87, in runTest
    local_ssh.channel.exec_command(cmd)
  File "/usr/lib/python2.7/dist-packages/paramiko/channel.py", line 209, in exec_command
    raise SSHException('Channel is not open')
SSHException: Channel is not open

如何保持频道畅通？

Answer 1

channel关于这一点,文档非常明确.您需要为每个频道打开一个新频道exec_command.

exec_command(*args,**kwds)

在服务器上执行命令.如果服务器允许,则通道将直接连接到正在执行的命令的stdin,stdout和stderr.

命令完成执行后,通道将关闭,无法重复使用.如果要执行另一个命令,则必须打开一个新通道.

该SSHClient对象有一个exec_command为您执行此操作的方法.