topic Re: Python script to change/update hostname's of multiple Cisco devices. in Controllers

Python script to change/update hostname's of multiple Cisco devices.

shivshankarjalanila — Mon, 21 Jun 2021 15:20:56 GMT

Hi,

It will be very helpful if someone can help with a script (preferably Python) using which I can change/update the hostnames of multiple Cisco devices instead of doing it one by one manually.

I already have the hostname configured just need to update the hostname across 100s of Cisco devices to maintain the standards.

Please note, I am very new to automation and for now, I only know how to SSH into Cisco devices using Python+Netmiko.

Thank you

Shiv

Re: Python script to change/update hostname's of multiple Cisco devices.

inderdeeps — Mon, 21 Jun 2021 15:32:59 GMT

@shivshankarjalanila : Check if it helps

https://thwack.solarwinds.com/product-forums/network-configuration-manager-ncm/f/forum/55733/hostname-change-in-multiple-cisco-devices

Re: Python script to change/update hostname's of multiple Cisco devices.

balaji.bandi — Mon, 21 Jun 2021 15:37:20 GMT

Here is Pythion script easy to understand and simple to replace what you like to replace on the devices :

https://github.com/grelleum/youtube-network-automation

check the youtube, his series simple, in hours time you can do what you want.

Re: Python script to change/update hostname's of multiple Cisco devices.

shivshankarjalanila — Mon, 21 Jun 2021 16:38:44 GMT

Hi @inderdeeps, Thank you for your response. I am looking for something simple to understand.

Re: Python script to change/update hostname's of multiple Cisco devices.

shivshankarjalanila — Mon, 21 Jun 2021 16:40:28 GMT

Hi @balaji.bandi, Thank you for your response.

I went through few initial videos. It seems simple and interesting. Let me go through all and see if I find the solution.

Thank you

Shiv

Re: Python script to change/update hostname's of multiple Cisco devices.

balaji.bandi — Mon, 21 Jun 2021 16:46:31 GMT

if you see all 9 or 10 videos, you become python network programmer can do day to day task.

Good Luck.

Re: Python script to change/update hostname's of multiple Cisco devices.

Seb Rupik — Tue, 29 Jun 2021 12:52:12 GMT

Hi there,

Try the following:

#!/usr/bin/env python3
import getpass
import csv
import netmiko
import paramiko
from argparse import ArgumentParser


def main():
    parser = ArgumentParser(description='Arguments for running oneLiner.py')
    parser.add_argument('-c', '--csv', required=True, action='store', help='Location of CSV file')
    args = parser.parse_args()

    ssh_username = input("SSH username: ")
    ssh_password = getpass.getpass('SSH Password: ')

    with open(args.csv, "r") as file:
        reader = csv.DictReader(file)
        for device_row in reader:
            try:
                ssh_session = netmiko.ConnectHandler(device_type='cisco_ios', ip=device_row['device_ip'],
                                                     username=ssh_username, password=ssh_password)

                print("+++++ {0} +++++".format(device_row['device_ip']))
                commands = ["hostname {0}".format(device_row['new_hostname'])]
                ssh_session.enable()
                ssh_session.send_config_set(commands)
                ssh_session.send_command("wr mem")
                ssh_session.disconnect()

            except (netmiko.ssh_exception.NetMikoTimeoutException,
                    netmiko.ssh_exception.NetMikoAuthenticationException,
                    paramiko.ssh_exception.SSHException) as s_error:
                print(s_error)


if __name__ == "__main__":
    main()

You will need to feed it a csv file with the following format:

device_ip,new_hostname
192.168.1.1,new_host01
192.168.1.2,new_host02
192.168.1.3,new_host03

# python3 -c new_hostnames.csv

The script will prompt you for a username and password and will use those credentials for every device in the csv file.

cheers,

Seb.

Re: Python script to change/update hostname's of multiple Cisco device

shivshankarjalanila — Tue, 01 Oct 2024 13:28:00 GMT

Hi There,

Thank you everyone for the help and pointers.

I completed the task using the script and prerequisite points mentioned below.

1. I ran Python on a Windows laptop.

2. Used a SwitchIPList.txt file.

3. I used the below script.

Task accomplished.

I have added a lot of separators, you can edit/remove them.

Below is the script that executed repetitive commands on multiple network nodes. I hope it helps.

from netmiko import ConnectHandler from getpass import getpass #import sys #SSH to multpile devices #create device template with open("SwitchIPList.txt") as switches: for IP in switches: Switch = { "device_type": "cisco_ios", "ip": IP, "username": input("Username: "), "password": getpass(), # "username": "", # "password": "", } net_connect = ConnectHandler(**Switch) ############################## Connect to IP ############################## print("*"*90) print ("Connecting to " + IP) print("*"*90) ############################## show commands ############################## output = net_connect.send_command("show run | s aaa group|radius server") print(output) print("-"*72) ############################## Config radius server ############################## config_commands = ["radius server naca001.nac.com\n", "address ipv4 10.200.0.1 auth-port 1812 acct-port 1813\n", "automate-tester username GNSRADIUS idle-time 10\n", "key YourPassword\n", "!\n", "radius server naca002.nac.com\n", "address ipv4 10.200.0.2 auth-port 1812 acct-port 1813\n", "automate-tester username GNSRADIUS idle-time 10\n", "key YourPassword\n", "!\n", ] output = net_connect.send_config_set(config_commands) print(output) print("-"*72) output = net_connect.send_command("show run | s aaa group|radius server") print(output) print("-"*72) ############################## Test NAC ############################## print("+"*10,"Test to radius server naca001.nac.com - 10.200.0.1","+"*10) output = net_connect.send_command("test aaa group NAC-V2 test test legacy") print(output) print("-"*72) output = net_connect.send_command("wr") print(output) print("-"*72) print("="*27,"END OF SWITCH","="*27) #Close the connection net_connect.disconnect()

Thank you

Shiv