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Mastering Python Networking 2nd edition by Eric Chou 9781789135992 1789135990

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ISBN 10:1789135990
ISBN 13:9781789135992
Author: Eric Chou

Master the art of using Python for a diverse range of network engineering tasks Key Features Explore the power of Python libraries to tackle difficult network problems efficiently and effectively Use Python for network device automation, DevOps, and software-defined networking Become an expert in implementing advanced network-related tasks with Python Book Description 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 this second edition of Mastering Python Networking, you’ll embark on a Python-based journey to transition from traditional network engineers to network developers ready for the next-generation of networks. This book begins by reviewing the basics of Python and teaches you how Python can interact with both legacy and API-enabled network devices. As you make your way through the chapters, you will then learn to leverage high-level Python packages and frameworks to perform network engineering tasks for automation, monitoring, management, and enhanced security. In the concluding chapters, you will use Jenkins for continuous network integration as well as testing tools to verify your network. By the end of this book, you will be able to perform all networking tasks with ease using Python. What you will learn Use Python libraries to interact with your network Integrate Ansible 2.5 using Python to control Cisco, Juniper, and Arista eAPI network devices Leverage existing frameworks to construct high-level APIs Learn how to build virtual networks in the AWS Cloud Understand how Jenkins can be used to automatically deploy changes in your network Use PyTest and Unittest for Test-Driven Network Development Who this book is for Mastering Python Networking is for network engineers and programmers who want to use Python for networking. Basic familiarity with Python programming and networking-related concepts such as Transmission Control Protocol/Internet Protocol (TCP/IP) will be useful.

Mastering Python Networking 2nd Table of contents:

Who this book is for

What this book covers

To get the most out of this book

Download the example code files

Download the color images

Conventions used

Get in touch

Reviews

Review of TCP/IP Protocol Suite and Python

An overview of the internet

Servers, hosts, and network components

The rise of data centers

Enterprise data centers

Cloud data centers

Edge data centers

The OSI model

Client-server model

Network protocol suites

The transmission control protocol

Functions and characteristics of TCP

TCP messages and data transfer

User datagram protocol

The internet protocol

The IP NAT and security

IP routing concepts

Python language overview

Python versions

Operating system

Running a Python program

Python built-in types

The None type

Numerics

Sequences

Mapping

Sets

Python operators

Python control flow tools

Python functions

Python classes

Python modules and packages

Summary

Low-Level Network Device Interactions

The challenges of the CLI

Constructing a virtual lab

Cisco VIRL

VIRL tips

Cisco DevNet and dCloud

GNS3

Python Pexpect library

Pexpect installation

Pexpect overview

Our first Pexpect program

More Pexpect features

Pexpect and SSH

Putting things together for Pexpect

The Python Paramiko library

Installation of Paramiko

Paramiko overview

Our first Paramiko program

More Paramiko features

Paramiko for servers

Putting things together for Paramiko

Looking ahead

Downsides of Pexpect and Paramiko compared to other tools

Idempotent network device interaction

Bad automation speeds bad things up

Summary

APIs and Intent-Driven Networking

Infrastructure as code

Intent-Driven Networking

Screen scraping versus API structured output

Data modeling for infrastructure as code

The Cisco API and ACI

Cisco NX-API

Lab software installation and device preparation

NX-API examples

The Cisco and YANG models

The Cisco ACI

The Python API for Juniper networks

Juniper and NETCONF

Device preparation

Juniper NETCONF examples

Juniper PyEZ for developers

Installation and preparation

PyEZ examples

The Arista Python API

Arista eAPI management

The eAPI preparation

eAPI examples

The Arista Pyeapi library

Pyeapi installation

Pyeapi examples

Vendor-neutral libraries

Summary

The Python Automation Framework – Ansible Basics

A more declarative framework

A quick Ansible example

The control node installation

Running different versions of Ansible from source

Lab setup

Your first Ansible playbook

The public key authorization

The inventory file

Our first playbook

The advantages of Ansible

Agentless

Idempotent

Simple and extensible

Network vendor support

The Ansible architecture

YAML

Inventories

Variables

Templates with Jinja2

Ansible networking modules

Local connections and facts

Provider arguments

The Ansible Cisco example

Ansible 2.5 connection example

The Ansible Juniper example

The Ansible Arista example

Summary

The Python Automation Framework – Beyond Basics

Ansible conditionals

The when clause

Ansible network facts

Network module conditional

Ansible loops

Standard loops

Looping over dictionaries

Templates

The Jinja2 template

Jinja2 loops

The Jinja2 conditional

Group and host variables

Group variables

Host variables

The Ansible Vault

The Ansible include and roles

The Ansible include statement

Ansible roles

Writing your own custom module

The first custom module

The second custom module

Summary

Network Security with Python

The lab setup

Python Scapy

Installing Scapy

Interactive examples

Sniffing

The TCP port scan

The ping collection

Common attacks

Scapy resources

Access lists

Implementing access lists with Ansible

MAC access lists

The Syslog search

Searching with the RE module

Other tools

Private VLANs

UFW with Python

Further reading

Summary

Network Monitoring with Python – Part 1

Lab setup

SNMP

Setup

PySNMP

Python for data visualization

Matplotlib

Installation

Matplotlib – the first example

Matplotlib for SNMP results

Additional Matplotlib resources

Pygal

Installation

Pygal – the first example

Pygal for SNMP results

Additional Pygal resources

Python for Cacti

Installation

Python script as an input source

Summary

Network Monitoring with Python – Part 2

Graphviz

Lab setup

Installation

Graphviz examples

Python with Graphviz examples

LLDP neighbor graphing

Information retrieval

Python parser script

Final playbook

Flow-based monitoring

NetFlow parsing with Python

Python socket and struct

ntop traffic monitoring

Python extension for ntop

sFlow

SFlowtool and sFlow-RT with Python

Elasticsearch (ELK stack)

Setting up a hosted ELK service

The Logstash format

Python helper script for Logstash formatting

Summary

Building Network Web Services with Python

Comparing Python web frameworks

Flask and lab setup

Introduction to Flask

The HTTPie client

URL routing

URL variables

URL generation

The jsonify return

Network resource API

Flask-SQLAlchemy

Network content API

Devices API

The device ID API

Network dynamic operations

Asynchronous operations

Security

Additional resources

Summary

AWS Cloud Networking

AWS setup

AWS CLI and Python SDK

AWS network overview

Virtual private cloud

Route tables and route targets

Automation with CloudFormation

Security groups and the network ACL

Elastic IP

NAT Gateway

Direct Connect and VPN

VPN Gateway

Direct Connect

Network scaling services

Elastic Load Balancing

Route53 DNS service

CloudFront CDN services

Other AWS network services

Summary

Working with Git

Introduction to Git

Benefits of Git

Git terminology

Git and GitHub

Setting up Git

Gitignore

Git usage examples

GitHub example

Collaborating with pull requests

Git with Python

GitPython

PyGitHub

Automating configuration backup

Collaborating with Git

Summary

Continuous Integration with Jenkins

Traditional change-management process

Introduction to continuous integration

Installing Jenkins

Jenkins example

First job for the Python script

Jenkins plugins

Network continuous integration example

Jenkins with Python

Continuous integration for Networking

Summary

Test-Driven Development for Networks

Test-driven development overview

Test definitions

Topology as code

Python’s unittest module

More on Python testing

pytest examples

Writing tests for networking

Testing for reachability

Testing for network latency

Testing for security

Testing for transactions

Testing for network configuration

Testing for Ansible

Pytest in Jenkins

Jenkins integration

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