我一直试图使用paramiko在Overture Box上运行命令来建立SSH连接。
我的脚本确实正确地连接到该框,没有发现任何问题,问题出现在脚本运行exec_command(cmd)方法时:
Traceback (most recent call last):
File "test.py", line 39, in <module>
stdin, stdout, stderr = ssh.exec_command("version")
File "/opt/csw/lib/python2.7/site-packages/paramiko/client.py", line 345, in exec_command
chan.exec_command(command)
File "/opt/csw/lib/python2.7/site-packages/paramiko/channel.py", line 60, in _check
return func(self, *args, **kwds)
File "/opt/csw/lib/python2.7/site-packages/paramiko/channel.py", line 229, in exec_command
self._wait_for_event()
File "/opt/csw/lib/python2.7/site-packages/paramiko/channel.py", line 1086, in _wait_for_event
raise e
paramiko.ssh_exception.SSHException: Channel closed.
使用Linux框作为目标主机的同一脚本会产生正确的结果
代码是借来的,我只是在谷歌上找到了一个片段:
import sys
import time
import select
import paramiko
host = raw_input("Hostname?: ")
i = 1
password = raw_input("Password?: ")
#
# Try to connect to the host.
# Retry a few times if it fails.
#
while True:
print "Trying to connect to %s (%i/30)" % (host, i)
try:
ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect(host, port=22, username="username", password=password)
print "Connected to %s" % host
break
except paramiko.AuthenticationException:
print "Authentication failed when connecting to %s" % host
sys.exit(1)
except:
print "Could not SSH to %s, waiting for it to start" % host
i += 1
time.sleep(2)
# If we could not connect within time limit
if i == 30:
print "Could not connect to %s. Giving up" % host
sys.exit(1)
# Send the command (non-blocking)
stdin, stdout, stderr = ssh.exec_command("version")
# Wait for the command to terminate
while not stdout.channel.exit_status_ready():
# Only print data if there is data to read in the channel
if stdout.channel.recv_ready():
rl, wl, xl = select.select([stdout.channel], [], [], 0.0)
if len(rl) > 0:
# Print data from stdout
print stdout.channel.recv(1024),
#
# Disconnect from the host
#
print "Command done, closing SSH connection"
ssh.close()
我发现了其他问题,据说这个问题可能与主机中的SFTP设置有关,但我能够做到:
sftp username@hostname
我在谷歌上搜索了一段时间,但到目前为止找不到任何有用的东西。
提前谢谢你的帮助。
编辑:差点忘了,我知道问题就在:
stdin, stdout, stderr = ssh.exec_command("version")
我以交互方式运行了整个脚本,当我运行那一行时它会中断。
这里有个解决办法
然后
exec_command(command) and then
recv()`,不需要睡眠。可能是序曲不支持SSH exec_命令请求。
我需要使用
transport.open_session()
,以及session.get_pty()
和session.invoke_shell()
来设置交互式shell会话,然后在session.send()
和session.recv()
不可用时,使用exec_command()
来为Cisco交换机和其他网络设备写入/读取shell会话。相关问题 更多 >
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