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

[shivshankarjalanila]

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

[inderdeeps]

@shivshankarjalanila : Check if it helps 

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

[shivshankarjalanila]

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

[balaji.bandi]

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.

[shivshankarjalanila]

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 

[balaji.bandi]

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

Good Luck.

[Seb Rupik]

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.