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)

Managing a cluster

Let's see how we can perform some management of all of these cluster nodes that we are creating.

There are only two ways in which you can go about managing these Swarm hosts and the containers on each host that you are creating, but first, you need to know some information about them.

Finding information on the cluster

As we have already seen, we can list the nodes within the cluster using our local Docker client, as it is already configured to connect to the Swarm manager host. We can simply type this:

$ docker info

This will give us lots of information about the host, as you can see from the following output, which I have truncated:

Containers: 0
Running: 0
Paused: 0
Stopped: 0
Images: 0