Book Image

Mastering Docker - Third Edition

By : Russ McKendrick, Scott Gallagher
Book Image

Mastering Docker - Third Edition

By: Russ McKendrick, Scott Gallagher

Overview of this book

Docker has been a game-changer when it comes to how modern applications are deployed and created. It has now grown into a key driver of innovation beyond system administration, with an impact on the world of web development. But how can you make sure you're keeping up with the innovations it's driving, or be sure you're using it to its full potential? Mastering Docker shows you how; this book not only demonstrates how to use Docker more effectively, but also helps you rethink and reimagine what's possible with it. You will cover concepts such as building, managing, and storing images, along with best practices to make you confident, before delving more into Docker security. You'll find everything related to extending and integrating Docker in new and innovative ways. Docker Compose, Docker Swarm, and Kubernetes will help you take control of your containers in an efficient manner. By the end of the book, you will have a broad, yet detailed, sense of what's possible with Docker, and how seamlessly it fits in with a range of other platforms and tools.
Table of Contents (17 chapters)

Roles within a Docker Swarm cluster

Which roles are involved with Docker Swarm? Let's take a look at the two roles a host can assume when running within a Docker Swarm cluster.

Swarm manager

The Swarm manager is a host that is the central management point for all Swarm hosts. Swarm manager is where you issue all your commands to control those nodes. You can switch between the nodes, join nodes, remove nodes, and manipulate those hosts.

Each cluster can run several Swarm managers. For production, it is recommended that you run a minimum of five Swarm managers: this would mean that our cluster can take a maximum of two Swarm manager node failures before you start to encounter any errors. Swarm managers use the Raft Consensus...