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

Adding a DNS check


Almost every application has external dependencies, such as databases, Redis caches, e-mail servers, and so on. Although it is generally reliable, DNS can occasionally cause problems and, at first glance, it can be difficult to diagnose. By adding a check that constantly checks the DNS record, you can be assured that these dependencies are available.

Getting ready

For this recipe, you will need an Ubuntu 14.04 host to act as the Sensu check-host and a Sensu server to connect to. You should also have installed the prerequisite packages as detailed in the recipe Installing check prerequisites.

How to do it…

Let's start by adding DNS check to track DNS records:

  1. For this recipe, we're going to install the sensu-plugins-dns. Use the following command to install the new plugin:

    $ sudo gem install sensu-plugins-dns
    
  2. You can test if the plugin has been installed successfully by issuing the following command:

    $ check-dns.rb -d www.packtpub.com
    
  3. You should see a response like the following...