Book Image

DevOps Automation Cookbook

By : Michael Duffy
Book Image

DevOps Automation Cookbook

By: Michael Duffy

Overview of this book

<p>There has been a recent explosion in tools that allow you to redefine the delivery of infrastructure and applications, using a combination of automation and testing to deliver continuous deployment. DevOps has garnered interest from every quarter, and is rapidly being recognized as a radical shift, as large as the Agile movement for the delivery of software.</p> <p>This book takes a collection of some of the coolest software available today and shows you how to use it to create impressive changes to the way you deliver applications and software. It tackles the plethora of tools that are now available to enable organizations to take advantage of the automation, monitoring, and configuration management techniques that define a DevOps-driven infrastructure.</p> <p>Starting off with the fundamental command-line tools that every DevOps enthusiast must know, this book will guide you through the implementation of the Ansible tool to help you facilitate automation and perform diverse tasks. You will explore how to build hosts automatically with the creation of Apt mirrors and interactive pre-seeds, which are of the utmost importance for Ubuntu automation. You will also delve into the concept of virtualization and creating and manipulating guests with ESXi. Following this, you will venture into the application of Docker; learn how to install, run, network, and restore Docker containers; and also learn how to build containers in Jenkins and deploy apps using a combination of Ansible, Docker, and Jenkins. You will also discover how to filter data with Grafana and the usage of InfluxDB along with unconventional log management. Finally, you will get acquainted with cloud infrastructure, employing the Heroku and Amazon AWS platforms.</p> <p>By tackling real-world issues, this book will guide you through a huge variety of tools, giving new users the ability to get up and running and offering advanced users some interesting recipes that may help with existing issues.</p>
Table of Contents (19 chapters)
DevOps Automation Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Managing SSH keys with Ansible


One of the most tedious administration tasks can be managing user keys. Although tools such as ssh-copy-id make it easy to copy your key to single servers, it can be a taller order to copy them out to several hundred or even a few thousand servers. Ansible makes this task exceptionally easy and allows you to mass-revoke keys when you need to ensure that access has been removed for users across a large server estate.

Getting ready

All you need to use for this recipe is a configured Ansible control node and an Ansible inventory describing your target nodes. You should also have a SSH key, both public and private that you wish to manage.

How to do it...

Let's use SSH keys to manage Ansible:

  1. The first thing we might want to do is create a user and simultaneously create a key for them. This is especially useful if you use a network jump box, as it means that you have no dependency on the user supplying a key; it's an integral part of the process. Run the following command...