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

Apache-Mesos


Apache-Mesos is a container cluster manager developed for very large clusters involving thousands of hosts. Mesos provides a distributed kernel that is running across different nodes in the cluster and provides APIs for the application to manage resources such as memory, CPU, disk, and scheduling these resources.

The major components of Mesos are as follows:

  • Mesos agent

  • Mesos master

  • ZooKeeper

  • Mesos frameworks

    Mesos component overview

Mesos master

The Mesos master daemon runs in the master node that manages all the slave nodes or agents and the Mesos frameworks. The master takes care of sharing the resource to the frameworks based on the configured scheduling policy, which can either be strict priority or fair sharing.

Mesos agent

Mesos agent is responsible for running the actual tasks. The agent reports to the master about the availability of the resources, which the master agent uses to allocate a particular task or framework to be ran on the agent.

ZooKeeper

In a typical Mesos deployment...