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
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Recovering from a disaster

Failures are a regular occurrence in large clusters. Hard drives fail, servers fail, even full data centers will go dark. Shifting services to cloud platforms such as AWS and Azure have helped, but even they have had entire regions go down. Using containers may make your applications more resistant to failure, but the hosts running those containers are still affected by any number of things. Properly engineered, your cluster should be able to cope with disaster. Here are a few things to keep in mind to keep your cluster safe.

Restarting the full cluster

There may be times when the entire swarm has to be shutdown. Hopefully, there will be time to properly shut down running services and the hosts. When the time comes to shutdown the hosts, start with the workers then shutdown the managers. When the cluster is started up again, start the managers first then the workers. Make sure that the managers have the same IP addresses or your nodes will come up and not be able...