执行一条命令后，paramiko ssh通道关闭-Python - python

我正在使用Python的Paramiko在删除服务器中执行命令。代码很简单。

这是我对SSHConn类的定义:

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

如何保持频道开放？

python大神给出的解决方案

channel文档对此非常清楚。您需要为每个exec_command打开一个新通道。

exec_command(* args，** kwds)

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

该命令执行完毕后，该通道将关闭且无法重复使用。如果要执行其他命令，则必须打开一个新通道。

SSHClient对象具有为您执行此操作的exec_command方法。