我打算使用paramiko在远程主机上运行几个命令,但是在运行命令后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')
那么有什么方法可以阻止ssh会话结束?或帕拉米科的任何替代品?
更新:
当连接到Linux服务器时,我能够在我的Macbook上保持呼叫exec_command
,但是当连接到开关时,在Linux服务器上{s}会话在exec_command
之后自动关闭并提出了一个
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会话始终保持活动状态?
paramiko调试模式信息返回如下:
启动线程(客户端模式):0x2657e10L
已连接(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lang:[u'']服务器lang :[u''] kex跟随?False
密码同意: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,远无无
切换到新密钥...
userauth没问题 身份验证(密码)成功!
[chan 0]最大数据包:32768字节
[chan 1]最大数据包:32768字节
[chan 0]最大数据包输出:32496字节
Secsh channel 0已打开。
Secsh channel 2打开FAILED:
资源短缺:资源短缺 [chan 0] Sesch频道0请求ok
[chan 0] EOF发送(0)
答案 0 :(得分:3)
您可以使用paramiko实现交互式shell,这样在远程shell上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
答案 1 :(得分:2)
我看到您在连接呼叫中使用timeout
参数:
ssh.connect(host, 22, user, passwd, timeout=3)
来自文档:
timeout(float) - TCP连接的可选超时(以秒为单位)
在我的一个脚本中,我只是这样做:
ssh = paramiko.SSHClient()
ssh.connect(host, username=settings.user)
保持连接打开,直到我调用
ssh.close()