Book Image

Native Docker Clustering with Swarm

By : Fabrizio Soppelsa, Chanwit Kaewkasi
Book Image

Native Docker Clustering with Swarm

By: Fabrizio Soppelsa, Chanwit Kaewkasi

Overview of this book

Docker Swarm serves as one of the crucial components of the Docker ecosystem and offers a native solution for you to orchestrate containers. It’s turning out to be one of the preferred choices for Docker clustering thanks to its recent improvements. This book covers Swarm, Swarm Mode, and SwarmKit. It gives you a guided tour on how Swarm works and how to work with Swarm. It describes how to set up local test installations and then moves to huge distributed infrastructures. You will be shown how Swarm works internally, what’s new in Swarmkit, how to automate big Swarm deployments, and how to configure and operate a Swarm cluster on the public and private cloud. This book will teach you how to meet the challenge of deploying massive production-ready applications and a huge number of containers on Swarm. You'll also cover advanced topics that include volumes, scheduling, a Libnetwork deep dive, security, and platform scalability.
Table of Contents (18 chapters)
Native Docker Clustering with Swarm
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Dedication
Preface

Token


Docker Swarm v1 includes an out-of-the-box discovery service, called Token. Token is integrated into the Docker Hub; hence, it requires all the Swarm nodes to be connected to the Internet and able to reach the Docker Hub. This is the main limitation of Token but, you will soon see, Token will allow us to make some practice in handling clusters.

In a nutshell, Token requires you to generate a UUID called, in fact, token. With this UUID, you can create a manager, act like a master, and join slaves to the cluster.

Re-architecting the example of Chapter 1 with token

If we want to keep it practical, it's time to take a look at an example. We'll use token to re-architect the example of Chapter 1, Welcome to Docker Swarm. As a novelty, the cluster will be not flat anymore, but it will consist of 1 master and 3 slaves and each node will have security enabled by default.

The master node will be the node exposing Swarm port 3376. We'll connect specifically to it in order to be able to drive the...