Book Image

The DevOps 2.1 Toolkit: Docker Swarm

By : Viktor Farcic
Book Image

The DevOps 2.1 Toolkit: Docker Swarm

By: Viktor Farcic

Overview of this book

Viktor Farcic's latest book, The DevOps 2.1 Toolkit: Docker Swarm, takes you deeper into one of the major subjects of his international best seller, The DevOps 2.0 Toolkit, and shows you how to successfully integrate Docker Swarm into your DevOps toolset. Viktor shares with you his expert knowledge in all aspects of building, testing, deploying, and monitoring services inside Docker Swarm clusters. You'll go through all the tools required for running a cluster. You'll travel through the whole process with clusters running locally on a laptop. Once you're confident with that outcome, Viktor shows you how to translate your experience to different hosting providers like AWS, Azure, and DigitalOcean. Viktor has updated his DevOps 2.0 framework in this book to use the latest and greatest features and techniques introduced in Docker. We'll go through many practices and even more tools. While there will be a lot of theory, this is a hands-on book. You won't be able to complete it by reading it on the metro on your way to work. You'll have to read this book while in front of the computer and get your hands dirty.
Table of Contents (22 chapters)
Title Page
Credits
About the Author
www.PacktPub.com
Customer Feedback
Preface
11
Embracing Destruction: Pets versus Cattle

Using node labels to constrain services


Labels are defined as key-value sets. We'll use the key env (short for environment). At the moment, we don't need to label the nodes used for CD tasks since we are not yet running them as services. We'll change that in one of the chapters that follow. For now, we only need to label the nodes that will be used to run our services in the production-like environment.

We'll use the nodes swarm-test-2 and swarm-test-3 as our production-like environment so we'll label them with the key env and the value prod-like.

Let's start with the node swarm-test-2:

docker node update \
    --label-add env=prod-like \
    swarm-test-2

We can confirm that the label was indeed added by inspecting the node:

docker node inspect --pretty swarm-test-2

The output of the node inspect command is as follows:

ID:                vq5hj3lt7dskh54mr1jw4zunb
Labels:
 - env = prod-like
Hostname:          swarm-test-2
Joined at:         2017-01-2123:01:40.557959238 +0000 utc
Status:
 State:...