如何保持ssh会话不使用paramiko过期?
我打算使用paramiko在远程主机上运行多个命令,但运行命令后ssh会话关闭。
下面列出的代码:
from paramiko import SSHClient
import paramiko
ssh = SSHClient()
ssh.load_system_host_keys()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect(host, 22, user, passwd, timeout=3)
stdin, stdout, stderr = ssh.exec_command('uname -a')
那么有没有办法阻止ssh会话关闭? 或者paramiko的任何替代品?
更新 :
当连接到Linux服务器时,我可以exec_command
在我的Macbook上调用exec_command
,但在连接到交换机时,在Linux服务器上执行exec_command
后,ssh会话自动关闭,
SSHException: paramiko.ssh_exception.SSHException: SSH session not active
>>> print ssh.get_transport()
>>> <paramiko.Transport at 0xf00216d0L (unconnected)>
>>> print ssh.get_transport().is_active()
>>> False
>>> print ssh.get_transport().is_authenticated()
>>> False
有没有办法让paramiko ssh会话始终处于活动状态?
paramiko调试模式信息返回如下:
开始线程(客户端模式):0x2657e10L
连接(版本1.99,客户端Comware-5.20)
kex algos:[u'diffie-hellman-group-exchange-sha1',u'diffie-hellman-group14-sha1',u'diffie-hellman-group1-sha1']服务器密钥:[u'ssh-rsa']客户端加密:[u'aes128-cbc',u'3des-cbc',u'des-cbc']服务器加密:[u'aes128-cbc',u'3des-cbc',u'des-cbc']客户端mac:[u'hmac-sha1',u'hmac-sha1-96',u'hmac-md5',u'hmac-md5-96']服务器mac:[u'hmac-sha1',u'hmac -sha1-96',u'hmac-md5',u'hmac-md5-96']客户端压缩:[u'none']服务器压缩:[u'none']客户端语言:[u'']服务器语言:[u''] kex跟随?假
密码商定:local = aes128-cbc,remote = aes128-cbc
使用kex diffie-hellman-group14-sha1; 服务器密钥类型ssh-rsa; 密码:本地aes128-cbc,远程aes128-cbc; mac:local hmac-sha1,remote hmac-sha1; 压缩:本地无,远程无
切换到新的键...
userauth是可以的
身份验证(密码)成功!
[chan 0]最大包:32768字节
[chan 1]最大包:32768字节
[chan 0]最大数据包输出:32496字节
Secsh通道0打开。
Secsh通道2打开失败:
资源短缺:资源短缺
[chan 0] Sesch频道0请求正常
[chan 0]发送EOF(0)
你可以使用paramiko实现一个交互式shell,这样在远程shell执行命令后通道不会关闭。
import paramiko
import re
class ShellHandler:
def __init__(self, host, user, psw):
self.ssh = paramiko.SSHClient()
self.ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
self.ssh.connect(host, username=user, password=psw, port=22)
channel = self.ssh.invoke_shell()
self.stdin = channel.makefile('wb')
self.stdout = channel.makefile('r')
def __del__(self):
self.ssh.close()
@staticmethod
def _print_exec_out(cmd, out_buf, err_buf, exit_status):
print('command executed: {}'.format(cmd))
print('STDOUT:')
for line in out_buf:
print(line, end="")
print('end of STDOUT')
print('STDERR:')
for line in err_buf:
print(line, end="")
print('end of STDERR')
print('finished with exit status: {}'.format(exit_status))
print('------------------------------------')
pass
def execute(self, cmd):
"""
:param cmd: the command to be executed on the remote computer
:examples: execute('ls')
execute('finger')
execute('cd folder_name')
"""
cmd = cmd.strip('n')
self.stdin.write(cmd + 'n')
finish = 'end of stdOUT buffer. finished with exit status'
echo_cmd = 'echo {} $?'.format(finish)
self.stdin.write(echo_cmd + 'n')
shin = self.stdin
self.stdin.flush()
shout = []
sherr = []
exit_status = 0
for line in self.stdout:
if str(line).startswith(cmd) or str(line).startswith(echo_cmd):
# up for now filled with shell junk from stdin
shout = []
elif str(line).startswith(finish):
# our finish command ends with the exit status
exit_status = int(str(line).rsplit(maxsplit=1)[1])
if exit_status:
# stderr is combined with stdout.
# thus, swap sherr with shout in a case of failure.
sherr = shout
shout = []
break
else:
# get rid of 'coloring and formatting' special characters
shout.append(re.compile(r'(x9B|x1B[)[0-?]*[ -/]*[@-~]').sub('', line).
replace('b', '').replace('r', ''))
# first and last lines of shout/sherr contain a prompt
if shout and echo_cmd in shout[-1]:
shout.pop()
if shout and cmd in shout[0]:
shout.pop(0)
if sherr and echo_cmd in sherr[-1]:
sherr.pop()
if sherr and cmd in sherr[0]:
sherr.pop(0)
self._print_exec_out(cmd=cmd, out_buf=shout, err_buf=sherr, exit_status=exit_status)
return shin, shout, sherr
我看到你在连接调用中使用timeout
参数:
ssh.connect(host, 22, user, passwd, timeout=3)
从文档:
timeout(float) - TCP连接的可选超时(以秒为单位)
在我的一个脚本中,我只是简单地做:
ssh = paramiko.SSHClient()
ssh.connect(host, username=settings.user)
这样可以保持连接打开,直到我打电话
ssh.close()
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