Python: Неподходящее соединение модуля Fabric

Question

Я работаю над модулем для выполнения команд удаленной оболочки с использованием модуля FABRIC python.

Моя базовая машина - это Linux-машина, работающая на дистрибутиве Centos 7, а моя удаленная машина - это дистрибутив FreeBSD.

Проблема, с которой я сталкиваюсь, немного запутанна.

Проблема заключается в том, что иногда ткань выполняет команду на удаленном компьютере и опубликовать выход без задоринки, но иногда он показывает тзд ошибка:

fabric.exceptions.NetworkError: Low level socket error connecting to host *.*.*.* on port 22: Unable to connect to port 22 on *.*.*.* 

Я не могу найти причину позади него.

Мой код выглядит this-> (Centos 7 машин) файл sshd_config

#!/usr/bin/env python 

###################### IMPORTS ########################## 
from __future__ import with_statement 
from fabric.api import * 
import sys 
import csv 
import re 
######################################################### 

def data_collector(): 

    with hide('output','running','warnings'), settings(warn_only=True): 
     env.hosts = '*.*.*.*' 
     env.user = 'root' 
     env.password = '*********' 
     env.port = 22 
       env.connection_attempts = 1 
       print(env) 
       return run("zfs list") 


def import_text(): 
     raw_data = data_collector() 
    #print(filename) 
    line = raw_data.split('\n') 
    #print(line[0]) 
    final = list() 
    for l in line: 
     final.append(re.sub(r'\s+', ',', l)) 

     final.pop(0) 
    for l in final: 
     print(l[4]) 
import_text() 

моего хозяина выглядит так

# $OpenBSD: sshd_config,v 1.93 2014/01/10 05:59:19 djm Exp $ 

# This is the sshd server system-wide configuration file. See 
# sshd_config(5) for more information. 

# This sshd was compiled with PATH=/usr/local/bin:/usr/bin 

# The strategy used for options in the default sshd_config shipped with 
# OpenSSH is to specify options with their default value where 
# possible, but leave them commented. Uncommented options override the 
# default value. 

# If you want to change the port on a SELinux system, you have to tell 
# SELinux about this change. 
# semanage port -a -t ssh_port_t -p tcp #PORTNUMBER 
# 
#Port 22 
#AddressFamily any 
#ListenAddress 0.0.0.0 
#ListenAddress :: 

# The default requires explicit activation of protocol 1 
#Protocol 2 

# HostKey for protocol version 1 
#HostKey /etc/ssh/ssh_host_key 
# HostKeys for protocol version 2 
HostKey /etc/ssh/ssh_host_rsa_key 
#HostKey /etc/ssh/ssh_host_dsa_key 
HostKey /etc/ssh/ssh_host_ecdsa_key 
HostKey /etc/ssh/ssh_host_ed25519_key 

# Lifetime and size of ephemeral version 1 server key 
#KeyRegenerationInterval 1h 
#ServerKeyBits 1024 

# Ciphers and keying 
#RekeyLimit default none 

# Logging 
# obsoletes QuietMode and FascistLogging 
#SyslogFacility AUTH 
SyslogFacility AUTHPRIV 
#LogLevel INFO 

# Authentication: 

#LoginGraceTime 2m 
#PermitRootLogin yes 
#StrictModes yes 
#MaxAuthTries 6 
#MaxSessions 10 

#RSAAuthentication yes 
#PubkeyAuthentication yes 

# The default is to check both .ssh/authorized_keys and .ssh/authorized_keys2 
# but this is overridden so installations will only check .ssh/authorized_keys 
AuthorizedKeysFile .ssh/authorized_keys 

#AuthorizedPrincipalsFile none 

#AuthorizedKeysCommand none 
#AuthorizedKeysCommandUser nobody 

# For this to work you will also need host keys in /etc/ssh/ssh_known_hosts 
#RhostsRSAAuthentication no 
# similar for protocol version 2 
#HostbasedAuthentication no 
# Change to yes if you don't trust ~/.ssh/known_hosts for 
# RhostsRSAAuthentication and HostbasedAuthentication 
#IgnoreUserKnownHosts no 
# Don't read the user's ~/.rhosts and ~/.shosts files 
#IgnoreRhosts yes 

# To disable tunneled clear text passwords, change to no here! 
#PasswordAuthentication yes 
#PermitEmptyPasswords no 
PasswordAuthentication yes 

# Change to no to disable s/key passwords 
#ChallengeResponseAuthentication yes 
ChallengeResponseAuthentication no 

# Kerberos options 
#KerberosAuthentication no 
#KerberosOrLocalPasswd yes 
#KerberosTicketCleanup yes 
#KerberosGetAFSToken no 
#KerberosUseKuserok yes 

# GSSAPI options 
GSSAPIAuthentication yes 
GSSAPICleanupCredentials no 
#GSSAPIStrictAcceptorCheck yes 
#GSSAPIKeyExchange no 
#GSSAPIEnablek5users no 

# Set this to 'yes' to enable PAM authentication, account processing, 
# and session processing. If this is enabled, PAM authentication will 
# be allowed through the ChallengeResponseAuthentication and 
# PasswordAuthentication. Depending on your PAM configuration, 
# PAM authentication via ChallengeResponseAuthentication may bypass 
# the setting of "PermitRootLogin without-password". 
# If you just want the PAM account and session checks to run without 
# PAM authentication, then enable this but set PasswordAuthentication 
# and ChallengeResponseAuthentication to 'no'. 
# WARNING: 'UsePAM no' is not supported in Red Hat Enterprise Linux and may cause several 
# problems. 
UsePAM yes 

#AllowAgentForwarding yes 
#AllowTcpForwarding yes 
#GatewayPorts no 
X11Forwarding yes 
#X11DisplayOffset 10 
#X11UseLocalhost yes 
#PermitTTY yes 
#PrintMotd yes 
#PrintLastLog yes 
#TCPKeepAlive yes 
#UseLogin no 
UsePrivilegeSeparation sandbox  # Default for new installations. 
#PermitUserEnvironment no 
#Compression delayed 
#ClientAliveInterval 0 
#ClientAliveCountMax 3 
#ShowPatchLevel no 
#UseDNS yes 
#PidFile /var/run/sshd.pid 
#MaxStartups 10:30:100 
#PermitTunnel no 
#ChrootDirectory none 
#VersionAddendum none 

# no default banner path 
#Banner none 

# Accept locale-related environment variables 
AcceptEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES 
AcceptEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT 
AcceptEnv LC_IDENTIFICATION LC_ALL LANGUAGE 
AcceptEnv XMODIFIERS 

# override default of no subsystems 
Subsystem sftp /usr/libexec/openssh/sftp-server 

# Example of overriding settings on a per-user basis 
#Match User anoncvs 
# X11Forwarding no 
# AllowTcpForwarding no 
# PermitTTY no 
# ForceCommand cvs server 

Любая идея, почему ????

Answer 1

Я выяснил, что проблема связана с MTU (максимальной передающей единицей) пакетов, передаваемых оболочкой. В случае большого размера иногда пакеты удалялись на принимающей стороне.