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

Creating and managing a Swarm

Let's now take a look at using Swarm and how we can perform the following tasks:

  • Creating a cluster
  • Joining workers
  • Listing nodes
  • Managing a cluster

Creating the cluster hosts

Let's start by creating a cluster of three machines. Since we are going to be creating a multi-node cluster on our local machine, we are going to use Multipass, which we covered in Chapter 6, Docker Machine, Vagrant, and Multipass, to launch the hosts by running the following commands:

$ multipass launch -n node1
$ multipass launch -n node2
$ multipass launch -n node3

This should give us three nodes; you can check this by just running the following command:

$ multipass list

You should see something similar to the following output:

Figure 8.3 – Launching the nodes using Multipass

You may remember from when we last used Multipass that bringing up a host doesn't mean that Docker is installed...