In a CoreOS environment, all of the user applications will be deployed as services inside a container. For most of these, user applications need to work coherently and hence, a mechanism is needed to discover these services and service parameters. Service discovery via etcd provides a way to publish the services and the required parameters with a service to other services in the system. The service discovery mechanism is not only useful for service parameter discovery but also involves the detection of the change of state of a member (the addition of a new member or the removal of a member running a service or a member going down), the state of the service (the service providing an application comes up or goes down), and service parameters (like the IP and port on which the service is provided, database connection end points, and so on). It is a requirement that the service information is available across all members at all times, which means...
Learning CoreOS
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Learning CoreOS
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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.
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Learning CoreOS
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Table of Contents (15 chapters)
Learning CoreOS
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Preface
Free Chapter
CoreOS, Yet Another Linux Distro?
Setting Up Your CoreOS Environment
Creating Your CoreOS Cluster and Managing the Cluster
Managing Services with User-Defined Constraints
Discovering Services Running in a Cluster
Service Chaining and Networking Across Services
Creating a Virtual Tenant Network and Service Chaining Using OVS
What Next?
Index
Customer Reviews