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

Swarm mode


Docker Swarm mode (for Docker Engines of version 1.12 or newer) imports the SwarmKit libraries in order to make distributed container orchestration over multiple hosts possible and easy to operate.

The main difference between SwarmKit and Swarm Mode is that Swarm Mode is integrated into Docker itself, starting from version 1.12. This means that Swarm Mode commands such as swarm, nodes, service, and task are available inside the Docker client, and that through the docker command it's possible to initiate and manage Swarms, as well as deploy services and tasks:

  • docker swarm init: This is to initialize a Swarm cluster

  • docker node ls: This is used to list the available nodes

  • docker service tasks: This is used to list the tasks associated to a specific service

Old versus new Swarm versus SwarmKit

At the time of writing, (August 2016), we have three Docker orchestration systems: the old one (that is) Swarm v1, SwarmKit, and the new one (that is) integrated Swarm Mode.

The original Swarm v1...