Run a command (to backup a configuration) on multiple servers (routers) in Python

Question

Is it possible to have a script iterate through each IP and backup running configuration on a local tftp server

import paramiko
import sys
import time


USER = "root"
PASS = "cisco"
HOST = ["10.10.10.10","11.11.11.11","12.12.12.12"]
i=0
while i <len(HOST)
def fn():
  client1=paramiko.SSHClient()
  #Add missing client key
  client1.set_missing_host_key_policy(paramiko.AutoAddPolicy())
  #connect to switch
  client1.connect(HOST,username=USER,password=PASS)
  print "SSH connection to %s established" %HOST

 show run | redirect tftp://10.10.10.20/HOST.cfg 
print "Configuration has been backed up"for  %HOST
i+1

show run | redirect tftp://10.10.10.20/HOST.cfg --- can I use variable name as a text file name?

Answer 1

• Use for h in HOST to iterate your HOST array;
• Use SSHClient.exec_command to execute the command;
• Use string.format to format your messages and commands.

for h in HOST:
    client = paramiko.SSHClient()
    #Add missing client key
    client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    #connect to switch
    client.connect(h, username = USER, password = PASS)
    print("SSH connection to {0} established".format(h))
    command = "show run | redirect tftp://10.10.10.20/{0}.cfg".format(h)
    (stdin, stdout, stderr) = client.exec_command(command)
    for line in stdout.readlines():
        print(line)
    client.close()
    print("Configuration has been backed up for {0}".format(h))

---

Obligatory warning: Do not use AutoAddPolicy - You are losing a protection against MITM attacks by doing so. For a correct solution, see Paramiko "Unknown Server".