Book Image

Mastering Docker, Fourth Edition - Fourth Edition

Book Image

Mastering Docker, Fourth Edition - Fourth Edition

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 a significant impact on the world of web development. Mastering Docker shows you how you can ensure that you're keeping up with the innovations it's driving and be sure you're using it to its full potential. This fourth edition not only demonstrates how to use Docker more effectively but also helps you rethink and reimagine what you can achieve with it. You'll start by building, managing, and storing images along with exploring best practices for working with Docker confidently. Once you've got to grips with Docker security, the book covers essential concepts for extending and integrating Docker in new and innovative ways. You'll also learn how to take control of your containers efficiently using Docker Compose, Docker Swarm, and Kubernetes. By the end of this Docker book, you’ll 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 (22 chapters)
1
Section 1: Getting Up and Running with Docker
8
Section 2: Clusters and Clouds
16
Section 3: Best Practices

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 the containers within your cluster—these are by using the docker service and docker stack commands, which we are going to be covering in the next section of the chapter.

Before we look at launching containers in our cluster, let's have a look at managing the cluster itself, starting with how you can find out more information on it.

Finding information on the cluster

As we have already seen, we can list the nodes within the cluster using the Docker client installed on node1. To find out more information, we can simply type this to the command line of node1:

$ docker info

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

Server:
 Containers: 0
 Images: 0
 Server Version: 19.03.8
 Swarm: active
  ...