Book Image

Docker Orchestration

By : Randall Smith
Book Image

Docker Orchestration

By: Randall Smith

Overview of this book

Docker orchestration is what you need when transitioning from deploying containers individually on a single host to deploying complex multi-container apps on many machines. This book covers the new orchestration features of Docker 1.12 and helps you efficiently build, test, and deploy your application using Docker. You will be shown how to build multi-container applications using Docker Compose. You will also be introduced to the building blocks for multi-host Docker clusters such as registry, overlay networks, and shared storage using practical examples. This book gives an overview of core tools such as Docker Machine, Swarm, and Compose which will enhance your orchestration skills. You’ll learn how to set up a swarm using the decentralized building block. Next, you’ll be shown how to make the most out of the in-built orchestration feature of Docker engine and you’ll use third-party tools such as Kubernetes, Mesosphere, and CoreOS to orchestrate your existing process. Finally, you will learn to deploy cluster hosts on cloud services and automate your infrastructure.
Table of Contents (17 chapters)
Docker Orchestration
About the Author
About the Reviewer
Customer Feedback

Setting up a swarm

The first step for running a swarm is to have a number of hosts ready with Docker installed. It does not matter if you use the install script from or if you use Docker Machine. You also need to be sure that a few ports are open between the servers, as given here:

  • 2377 TCP port for cluster management

  • 7946 TCP and UDP port for node communication

  • 4789 TCP and UDP port for overlay network

Take a moment to get or assign a static IP address to the hosts that will be the swarm managers. Each manager must have a static IP address so that workers know how to connect to them. Worker addresses can be dynamic but the IP of the manager must be static.

As you plan your swarm, take a moment to decide how many managers you are going to need. The minimum number to run and still maintain fault tolerance is three. For larger clusters, you may need as many as five or seven. Very rarely will you need more than that. In any case, the number of managers should be odd. Docker Swarm...