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

Chapter 2. Discover the Discovery Services

In Chapter 1, Welcome to Docker Swarm we created a simple yet well functioning local Docker Swarm cluster using the nodes:// mechanism. This system is not very practical, except for learning the Swarm fundamentals.

In fact, it is just a flat model that does not contemplate any true master-slave architecture, not to mention the high-level services, such as nodes discovery and auto-configuration, resilience, leader elections, and failover (high availability). In practice, it's not suitable for a production environment.

Apart from nodes://, Swarm v1 officially supports four discovery services; however, one of them, Token, is a trivial non-production one. Basically, with Swarm v1 you need to integrate a discovery service manually, while with Swarm Mode (from Docker 1.12), a discovery service, Etcd, is already integrated. In this chapter we're going to cover:

  • Discovery services

  • A test-grade discovery service: Token

  • Raft theory and Etcd

  • Zookeeper and Consul...