Book Image

Puppet 5 Beginner's Guide - Third Edition

By : John Arundel
Book Image

Puppet 5 Beginner's Guide - Third Edition

By: John Arundel

Overview of this book

Puppet 5 Beginner’s Guide, Third Edition gets you up and running with the very latest features of Puppet 5, including Docker containers, Hiera data, and Amazon AWS cloud orchestration. Go from beginner to confident Puppet user with a series of clear, practical examples to help you manage every aspect of your server setup. Whether you’re a developer, a system administrator, or you are simply curious about Puppet, you’ll learn Puppet skills that you can put into practice right away. With practical steps giving you the key concepts you need, this book teaches you how to install packages and config files, create users, set up scheduled jobs, provision cloud instances, build containers, and so much more. Every example in this book deals with something real and practical that you’re likely to need in your work, and you’ll see the complete Puppet code that makes it happen, along with step-by-step instructions for what to type and what output you’ll see. All the examples are available in a GitHub repo for you to download and adapt for your own server setup.
Table of Contents (21 chapters)
Puppet 5 Beginner's Guide Third Edition
Credits
About the Author
Acknowledgments
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface
Index

Networking and orchestration


We started off the chapter by saying that containers are completely self-contained, and have no access to each other, even if they're running on the same host. But to run real applications, we need containers to communicate. Fortunately, there is a way to do this: the Docker network.

Connecting containers

A Docker network is like a private chat room for containers: all the containers inside the network can talk to each other, but they can't talk to containers outside it or in other networks, and vice versa. All you need to do is have Docker create a network, give it a name, and then you can start containers inside that network and they will be able to talk to each other.

Let's develop an example to try this out. Suppose we want to run the Redis database inside a container, and send data to it from another container. This is a common pattern for many applications.

In our example, we're going to create a Docker network, and start two containers inside it. The first...