Book Image

Mastering Python Networking - Fourth Edition

By : Eric Chou
Book Image

Mastering Python Networking - Fourth Edition

By: Eric Chou

Overview of this book

Networks in your infrastructure set the foundation for how your application can be deployed, maintained, and serviced. Python is the ideal language for network engineers to explore tools that were previously available to systems engineers and application developers. In Mastering Python Networking, Fourth edition, you'll embark on a Python-based journey to transition from a traditional network engineer to a network developer ready for the next generation of networks. This new edition is completely revised and updated to work with the latest Python features and DevOps frameworks. In addition to new chapters on introducing Docker containers and Python 3 Async IO for network engineers, each chapter is updated with the latest libraries with working examples to ensure compatibility and understanding of the concepts. Starting with a basic overview of Python, the book teaches you how it can interact with both legacy and API-enabled network devices. You will learn to leverage high-level Python packages and frameworks to perform network automation tasks, monitoring, management, and enhanced network security, followed by AWS and Azure cloud networking. You will use Git for code management, GitLab for continuous integration, and Python-based testing tools to verify your network.
Table of Contents (19 chapters)
17
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18
Index

The Nornir Framework

Nornir (https://nornir.readthedocs.io/en/latest/) is a pure Python automation framework intended to be used directly from Python. We will start with installing nornir in our environment:

(venv)$ pip install nornir nornir_utils nornir_netmiko

Nornir expects us to define an inventory file, hosts.yaml, consisting of the device information in a YAML format. The information specified in this file is no different than what we have previously defined using the Python dictionary in the Netmiko example:

---
lax-edg-r1:
    hostname: '192.168.2.51'
    port: 22
    username: 'cisco'
    password: 'cisco'
    platform: 'cisco_ios'
lax-edg-r2:
    hostname: '192.168.2.52'
    port: 22
    username: 'cisco'
    password: 'cisco'
    platform: 'cisco_ios'

We can use the netmiko plugin from the nornir library to interact with our device, as illustrated in the chapter2_5.py file:

#!/usr/bin/env python...