python - paramiko python 模块卡在 stdout.read()

Question

我正在使用下面的代码:

import paramiko

def runSshCmd(hostname, username, password, cmd, timeout=None):          
    client = paramiko.SSHClient()
    client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    client.connect(hostname, username=username, password=password,
            allow_agent=False, look_for_keys=False, timeout=timeout) 
    stdin, stdout, stderr = client.exec_command(cmd)
    stdin.flush()
    data = stdout.read()
    print (data)
    client.close()

runSshCmd("10.128.12.32", "root", "C0mput3Gr!d", "ts_menu")

当涉及到 stdout.read() 时，它会挂起...有时它会在很长时间后打印输出。

能否就此问题提出建议？

我看到此问题已在 :

中报告

https://bugs.python.org/issue24026

python有没有更好的ssh连接和运行命令的模块？？

Answer 1

可能与 https://github.com/paramiko/paramiko/issues/109 有关

下面是对我所面临的问题以及我如何解决它的解释。

我也遇到过这个问题是因为 stdout.channel.eof_received == 0

import paramiko
client = paramiko.SSHClient()
client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
client.connect("1.1.1.1", username="root", password="pass")
stdin, stdout, stderr = client.exec_command("service XXX start")

stdin、stdout 和 stderr 保持打开状态...

>>> print stdin
<paramiko.ChannelFile from <paramiko.Channel 3 (open) window=2097152 in-buffer=50 -> <paramiko.Transport at 0x17eff90L (cipher aes128-ctr, 128 bits) (active; 1 open channel(s))>>>
>>> print stdout
<paramiko.ChannelFile from <paramiko.Channel 3 (open) window=2097152 in-buffer=50 -> <paramiko.Transport at 0x17eff90L (cipher aes128-ctr, 128 bits) (active; 1 open channel(s))>>>
>>> print stderr
<paramiko.ChannelFile from <paramiko.Channel 3 (open) window=2097152 in-buffer=50 -> <paramiko.Transport at 0x17eff90L (cipher aes128-ctr, 128 bits) (active; 1 open channel(s))>>>

所以没有收到EOF...

>>> print stdin.channel.eof_received
0

通常我会收到 True 并且只能使用 stdout.read()，但为了安全起见我使用了这个解决方法(有效!):等待超时，强制执行 stdout.channel.close() 然后执行 stdout.read():

>>> timeout = 30
>>> import time
>>> endtime = time.time() + timeout
>>> while not stdout.channel.eof_received:
...     sleep(1)
...     if time.time() > endtime:
...         stdout.channel.close()
...         break
>>> stdout.read()
'Starting XXX: \n[  OK  ]\rProgram started . . .\n'
>>>

顺便说一句，我使用:

Python 2.6.6
paramiko (1.15.2)

希望这有助于...