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

Cluster management


To illustrate cluster operations better, let's take a look at an example made up of three managers and ten workers. The first basic operation is listing nodes, with docker node ls command:

You can reference to the nodes by calling them either by their hostname (manager1) or by their ID (ctv03nq6cjmbkc4v1tc644fsi). The other columns in this list statement describes the properties of the cluster nodes.

  • STATUS is about the physical reachability of the node. If the node is up, it's Ready, otherwise it's Down.

  • AVAILABILITY is the node availability. A node state can either be Active (participating in the cluster operations), Pause (in standby, suspended, not accepting tasks), or Drain (waiting to be evacuated its tasks).

  • MANAGER STATUS is the current status of manager. If a node is not the manager, this field will be empty. If a node is manager, this field can either be Reachable (one of the managers present to guarantee high availability) or Leader (the host leading all operations...