簡介

https://github.com/ktbyers/netmiko

Multi-vendor library to simplify Paramiko SSH connections to network devices

支援多裝置廠商的庫，簡化SSH連線工作。

https://pynet.twb-tech.com/blog/automation/netmiko.html

The purposes of this library are the following:

• Successfully establish an SSH connection to the device
• Simplify the execution of show commands and the retrieval of output data
• Simplify execution of configuration commands including possibly commit actions
• Do the above across a broad set of networking vendors and platforms

目的：

成功建立SSH連線

簡化執行的show命令，和獲取結果

簡化執行配置命令，包括可能的commit動作

跨網路裝置廠商和平臺

API

https://ktbyers.github.io/netmiko/docs/netmiko/index.html#netmiko.ConnectHandler

def send_command(self, command_string, expect_string=None, delay_factor=1, max_loops=500, auto_find_prompt=True, strip_prompt=True, strip_command=True, normalize=True, use_textfsm=False, textfsm_template=None, use_genie=False, cmd_verify=True)

Execute command_string on the SSH channel using a pattern-based mechanism. Generally used for show commands. By default this method will keep waiting to receive data until the network device prompt is detected. The current network device prompt will be determined automatically.

def send_config_set(self, config_commands=None, exit_config_mode=True, delay_factor=1, max_loops=150, strip_prompt=False, strip_command=False, config_mode_command=None, cmd_verify=True, enter_config_mode=True)

Send configuration commands down the SSH channel.

config_commands is an iterable containing all of the configuration commands. The commands will be executed one after the other.

Automatically exits/enters configuration mode.

Demo

https://github.com/ktbyers/netmiko/blob/develop/EXAMPLES.md#connecting-to-multiple-devices

show

from netmiko import ConnectHandler
from getpass import getpass

cisco1 = { 
    "device_type": "cisco_ios",
    "host": "cisco1.lasthop.io",
    "username": "pyclass",
    "password": getpass(),
}

# Show command that we execute.
command = "show ip int brief"

with ConnectHandler(**cisco1) as net_connect:
    output = net_connect.send_command(command)

# Automatically cleans-up the output so that only the show output is returned
print()
print(output)
print()

https://github.com/ktbyers/netmiko/blob/develop/EXAMPLES.md#configuration-changes

#!/usr/bin/env python
from netmiko import ConnectHandler
from getpass import getpass

device = {
    "device_type": "cisco_ios",
    "host": "cisco1.lasthop.io",
    "username": "pyclass",
    "password": getpass(),
}

commands = ["logging buffered 100000"]
with ConnectHandler(**device) as net_connect:
    output = net_connect.send_config_set(commands)
    output += net_connect.save_config()

print()
print(output)
print()

Juniper裝置的config模式需要特殊處理

https://ultraconfig.com.au/blog/netmiko-automation-on-juniper-routers-full-tutorial-for-beginners/

需要呼叫commit

呼叫send_config_set需要新增exit_config_mode引數

# Edit the candidate configuration
config_commands = [ 'set interfaces ge-0/0/1 unit 0 family inet address 10.10.10.10/24',
                    'set interfaces ge-0/0/1 unit 0 description "Test Config"']
output = net_connect.send_config_set(config_commands, exit_config_mode=False)
print(output)

# Commit the config changes
output = net_connect.commit()
print(output)