import sys
import time
import paramiko
import os
import cmd
import datetime

now = datetime.datetime.now()

username = 'xxx'
password = 'xxx'

from zenoss import Zenoss
zenoss = Zenoss('http://x.x.x.x:8080/', 'xx', 'xx')

with open('/home/xxxx/hosts_all.txt', 'w') as f:
    for device in zenoss.get_devices()['devices']:
            print(device['name'], file=f)
    f.close()

f = open('/home/xxxx/hosts_all.txt', 'r')
read_f = f.readlines()
f.close()
for i in range(1, len(read_f)):

    remote_conn_pre = paramiko.SSHClient()


    remote_conn_pre.set_missing_host_key_policy(
         paramiko.AutoAddPolicy())

    remote_conn_pre.connect(read_f[i], username=username, password=password, look_for_keys=False, allow_agent=False)
    print("SSH connection established to %s" % read_f[i])

    remote_conn = remote_conn_pre.invoke_shell()
    print("Interactive SSH session established")

    list_of_comm = ["environment no moren", "admin display-confign"]

    for i in range(len(list_of_comm)):
        remote_conn.send(list_of_comm[i])

        time.sleep(2)

        output = remote_conn.recv(5000)
        filename = "%s_%.2i-%.2i-%i" % (read_f[i],now.day,now.month,now.year)
        print(str(output) + 'n', file=filename)

Traceback (most recent call last):
  File "conf_backup.py", line 43, in <module>
    remote_conn_pre.connect(read_f[i], username=username, password=password, look_for_keys=False, allow_agent=False)
  File "/usr/local/lib/python3.4/dist-packages/paramiko/client.py", line 283, in connect
    to_try = list(self._families_and_addresses(hostname, port))
  File "/usr/local/lib/python3.4/dist-packages/paramiko/client.py", line 187, in _families_and_addresses
    addrinfos = socket.getaddrinfo(hostname, port, socket.AF_UNSPEC, socket.SOCK_STREAM)
  File "/usr/lib/python3.4/socket.py", line 533, in getaddrinfo
    for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno -2] Name or service not known