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Ansible Part 3: Your Network As Code

"Gitting" the Code

All of the code and examples for this lesson is located in the netprog_basics/netdevops/ansible_part_3 directory. Clone and access it with the following commands:

git clone https://github.com/CiscoDevNet/netprog_basics
cd netprog_basics/netdevops/ansible_part_3

Local Workstation Setup

Be sure to complete the General Workstation Setup instructions before beginning this lesson.

Ansible Version Information

Like many automation tools, Ansible is a rapidly evolving and updating tool. With each release some key parts of Ansible have evolved. Elements such as inventory management, device connections, and playbook/module structure evolve.

The videos, slides, and labs in this module were created using the version of Ansible that was current at the time, but much has changed since then. The examples included in the repository have been tested with the version of Ansible listed in the requirements.txt files that accompany each lab.

You may find slight differences in the playbooks, variables files, configuration, etc from the video. These differences reflect updates to Ansible since the video was recorded.

It is highly recommended you leverage the listed version of Ansible initially. If you wish to explore and test newer versions of Ansible, be aware you may run into problems.

Python Environment Setup

It is recommended that this lesson be completed using Python 3.8. Other versions of Python 3 should also work.

Note about Python 2: Python 2 was sunset by Python Software Foundation on January 1, 2020. This means that no more updates to Python 2 are being worked on, including security updates. Python 3 is now the recommended version of Python for everyone to use. Most Python developers of software, packages, and scripts have migrated to Python 3 already, however you may find some older scripts and tools that are no longer maintained that only work with Python 2.

You may see/hear references to Python 2 within the videos in this course from before January 2020, however all examples scripts and demos available in the GitHub repo to run have been updated to leverage Python 3.

It is highly recommended to leverage Python Virtual Environments for completing exercises in this course.

There is no need to create independent venv for each lesson, but you can if you choose.

Follow these steps to create and activate a venv.

Note: If you are leveraging a shared venv across all lessons simply activate it.

# OS X or Linux
python3 -m venv venv
source venv/bin/activate
# Windows
python -m venv venv
venv/Scripts/activate

Install Python Requirements for Lesson

With the Virtual Environment activated, use pip to install the necessary requirements.

# From the code directory for this lesson
pip install -r requirements.txt

DevNet Sandbox

This lesson leverages the Open NX-OS with Nexus 9Kv On VIRL Sandbox.

You will need to reserve an instance of the sandbox, and establish a VPN connection to your individual Sandbox to complete this lab.

Note: While this Sandbox includes a devbox (developer workstation), the example code and playbooks should be executed from your own local development workstation. Leverage the "General Workstation Setup" and "Local Workstation Setup" instructions to prepare your system for this lab.

Post Reservation Setup

This lesson leverages a different VIRL topology than Ansible Part 1 and Part 2 use. Before beginning this lesson run the following command to reconfigure the Sandbox with the proper topology.

From the netprog_basics/netdevops/ansible_part_3 directory

cd virl_sbx_mgmt/
python virl_simulation_setup.py

Download Slides

You can download the slides for this lesson here.

Suggestion: Right click, "Open in new tab"