[英]How to keep paramiko ssh session open after loggin in using python?
[英]How to keep ssh session not expired using paramiko?
我打算使用paramiko在遠程主機上運行幾個命令,但運行命令后ssh會話關閉。
下面列出的代碼:
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')
那么有什么方法可以阻止ssh會話結束? 或帕拉米科的任何替代品?
更新 :
當連接到Linux服務器時,我能夠在我的Macbook上調用exec_command
,但是當連接到交換機時,在Linux服務器上執行exec_command
一次后,ssh會話自動關閉並引發
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
是否有任何方法可以讓paramiko ssh會話始終保持活動狀態?
paramiko調試模式信息返回如下:
啟動線程(客戶端模式):0x2657e10L
已連接(版本1.99,客戶端Comware-5.20)
kex algos:[u'diffie-hellman-group-exchange-sha1',u'diffie-hellman-group14-sha1',u'diffie-hellman-group1-sha1']服務器密鑰:[u'ssh-rsa']客戶端加密:[u'aes128-cbc',u'3des-cbc',u'des-cbc']服務器加密:[u'aes128-cbc',u'3des-cbc',u'des-cbc']客戶端mac:[u'hmac-sha1',u'hmac-sha1-96',u'hmac-md5',u'hmac-md5-96']服務器mac:[u'hmac-sha1',u'hmac -sha1-96',u'hmac-md5',u'hmac-md5-96']客戶端壓縮:[u'none']服務器壓縮:[u'none']客戶端lang:[u'']服務器lang :[u''] kex跟隨?錯誤
密碼同意:local = aes128-cbc,remote = aes128-cbc
使用kex diffie-hellman-group14-sha1; 服務器密鑰類型ssh-rsa; 密碼:本地aes128-cbc,遠程aes128-cbc; mac:local hmac-sha1,remote hmac-sha1; compression:local none,remote none
切換到新密鑰......
userauth沒問題
身份驗證(密碼)成功!
[chan 0]最大數據包:32768字節
[chan 1]最大數據包:32768字節
[chan 0]最大數據包輸出:32496字節
Secsh頻道0已打開。
Secsh channel 2 open FAILED:
資源短缺:資源短缺
[chan 0] Sesch頻道0請求確定
[chan 0] EOF發送(0)
您可以使用paramiko實現交互式shell,這樣在遠程shell上執行命令后通道不會關閉。
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connect調用中使用了timeout
參數:
ssh.connect(host, 22, user, passwd, timeout=3)
從文檔:
timeout(float) - TCP連接的可選超時(以秒為單位)
在我的一個腳本中,我只是這樣做:
ssh = paramiko.SSHClient()
ssh.connect(host, username=settings.user)
這使得連接保持打開狀態直到我打電話
ssh.close()
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