Book Image

Learning CoreOS

By : Kingston Smiler. S, Shantanu Agrawal
Book Image

Learning CoreOS

By: Kingston Smiler. S, Shantanu Agrawal

Overview of this book

CoreOS is an open source operating system developed upon the Linux kernel. The rise of CoreOS is directly related to the rise of Docker (a Linux container management system). It is a minimal operating system layer and takes a different approach to automating the deployment of containers. The major difference between CoreOS and other Linux distributions is that CoreOS was designed to deploy hundreds of servers. CoreOS immensely helps the users to create systems, which are easy to scale and manage, making life easier for all, be it developer, QA, or deployer. This book is all about setting up, deploying, and using CoreOS to manage clusters and clouds. It will help you understand what CoreOS is and its benefits as a cloud orchestration platform. First, we’ll show you how to set up a simple CoreOS instance with single node in the cluster and how to run a Docker container inside the CoreOS instance. Next, you’ll be introduced to Fleet and systemd, and will deploy and distribute Docker services across different nodes in cluster using Fleet. Later, you’ll be briefed about running services in a cluster with constraints, publishing the services already running on the cluster to new services, and making your services interact with each other. We conclude by teaching you about advanced container networking. By the end of the book, you will know the salient features of CoreOS and will be able to deploy, administrate, and secure a CoreOS environment.
Table of Contents (15 chapters)
Learning CoreOS
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Preface
Index

Update and patches – CoreUpdate


CoreUpdate is a service available as part of Premium Manged Service targeted at Enterprise customers who require support and SLA-based support in case they face issues with deployment. CoreUpdate helps to monitor cluster health, cluster software versions, manage updates, and patch deployment.

CoreUpdates provides a web interface and a command-line interface to view the versions running on each of the CoreOS instances and to schedule upgrades on them. All instances of the CoreOS can be logically distributed into multiple application groups, and upgrades can be managed individually for those applications. For instance, they can be configured to pick the upgrade/patch from different channels like stable/beta/alpha. They can be scheduled at different times and can have different metadata, like where to pick the package for upgrade/patch. During the upgrade process, progress of the upgrade is displayed and any error/information/warnings are displayed to take corrective...