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You're reading from Hands-On Enterprise Automation with Python Automate common administrative and security tasks with Python

Product type Paperback

Published in Jun 2018

Publisher Packt

ISBN-13 9781788998512

Length 398 pages

Edition 1st Edition

Languages

Python

Tools

Ansible

Concepts

Build Automation

Author (1):

Aly

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Table of Contents (25) Chapters

Title Page

Packt Upsell

Contributors

Preface

1. Setting Up Our Python Environment FREE CHAPTER

2. Common Libraries Used in Automation

3. Setting Up the Network Lab Environment

4. Using Python to Manage Network Devices

5. Extracting Useful Data from Network Devices

6. Configuration Generator with Python and Jinja2

7. Parallel Execution of Python Script

8. Preparing a Lab Environment

9. Using the Subprocess Module

10. Running System Administration Tasks with Fabric

11. Generating System Reports and System Monitoring

12. Interacting with the Database

13. Ansible for System Administration

14. Creating and Managing VMware Virtual Machines

15. Interacting with the OpenStack API

16. Automating AWS with Boto3

17. Using the Scapy Framework

18. Building a Network Scanner Using Python

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Index

Creating instances from Python

To get instance up and running, OpenStack instances require three components. The boot image, which is provided by glance, the network ports, which provided by neutron, and finally, the compute flavor that defines the number of CPUs, amount of RAM that will be allocated to the instance and disk size. The flavor is provided by nova project.

Creating the image

We will start by downloading a cirros image to the automation server. cirros is a lightweight, Linux-based image, used by many OpenStack developers and testers around the world to validate the functionality of OpenStack services:

#cd /root/ ; wget http://download.cirros-cloud.net/0.4.0/cirros-0.4.0-x86_64-disk.img

Then, we will upload the image to the OpenStack image repository using glanceclient. Notice that we need to have the keystone token and the session parameter first, in order to communicate with glance, otherwise, glance won't accept any API requests from us.

The script will be as follows: